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<div class="pre-content"><div><div class="bk_prnt"><p class="small">NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.</p><p>PDQ Cancer Information Summaries [Internet]. Bethesda (MD): National Cancer Institute (US); 2002-. </p></div><div class="iconblock clearfix whole_rhythm no_top_margin bk_noprnt"><a class="img_link icnblk_img" title="Table of Contents Page" href="/books/n/pdqcis/"><img class="source-thumb" src="/corehtml/pmc/pmcgifs/bookshelf/thumbs/th-pdqcis-lrg.png" alt="Cover of PDQ Cancer Information Summaries" height="100px" width="80px" /></a><div class="icnblk_cntnt eight_col"><h2>PDQ Cancer Information Summaries [Internet].</h2><a data-jig="ncbitoggler" href="#__NBK66059_dtls__">Show details</a><div style="display:none" class="ui-widget" id="__NBK66059_dtls__"><div>Bethesda (MD): <a href="http://www.cancer.gov/" ref="pagearea=page-banner&targetsite=external&targetcat=link&targettype=publisher">National Cancer Institute (US)</a>; 2002-.</div></div><div class="half_rhythm"></div><div class="bk_noprnt"><form method="get" action="/books/n/pdqcis/" id="bk_srch"><div class="bk_search"><label for="bk_term" class="offscreen_noflow">Search term</label><input type="text" title="Search this book" id="bk_term" name="term" value="" data-jig="ncbiclearbutton" /> <input type="submit" class="jig-ncbibutton" value="Search this book" submit="false" style="padding: 0.1em 0.4em;" /></div></form></div></div></div></div></div>
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<div class="main-content lit-style" itemscope="itemscope" itemtype="http://schema.org/CreativeWork"><div class="meta-content fm-sec"><h1 id="_NBK66059_"><span class="title" itemprop="name">Skin Cancer Prevention (PDQ®)</span></h1><div class="subtitle whole_rhythm">Health Professional Version</div><p class="contrib-group"><span itemprop="author">PDQ Screening and Prevention Editorial Board</span>.</p><p class="small">Published online: December 8, 2023.</p></div><div class="jig-ncbiinpagenav body-content whole_rhythm" data-jigconfig="allHeadingLevels: ['h2'],smoothScroll: false" itemprop="text"><div id="_abs_rndgid_" itemprop="description"><p id="CDR0000062764__202">This PDQ cancer information summary for health professionals provides comprehensive, peer-reviewed, evidence-based information about skin cancer prevention. It is intended as a resource to inform and assist clinicians in the care of their patients. It does not provide formal guidelines or recommendations for making health care decisions.</p><p id="CDR0000062764__203">This summary is reviewed regularly and updated as necessary by the PDQ Screening and Prevention Editorial Board, which is editorially independent of the National Cancer Institute (NCI). The summary reflects an independent review of the literature and does not represent a policy statement of NCI or the National Institutes of Health (NIH).</p></div><div id="CDR0000062764__146"><h2 id="_CDR0000062764__146_">Who Is at Risk?</h2><p id="CDR0000062764__147">Individuals who have light-hair and -eye color, freckles, and who sunburn easily are particularly susceptible to developing skin cancer.[<a class="bk_pop" href="#CDR0000062764_rl_146_1">1</a>] There are two primary types of skin cancer, keratinocyte carcinoma (including basal cell carcinoma and squamous cell carcinoma [SCC]) and melanoma. Observational and analytic epidemiological studies have consistently shown that increased cumulative sun exposure is a risk factor for keratinocyte carcinoma.[<a class="bk_pop" href="#CDR0000062764_rl_146_1">1</a>,<a class="bk_pop" href="#CDR0000062764_rl_146_2">2</a>] Melanoma risk correlates with common and atypical nevi.[<a class="bk_pop" href="#CDR0000062764_rl_146_3">3</a>] Some studies suggest that there may be an interplay between genetic phenotype and sun exposure and that there may be two pathways to melanoma development.[<a class="bk_pop" href="#CDR0000062764_rl_146_4">4</a>-<a class="bk_pop" href="#CDR0000062764_rl_146_7">7</a>]</p><p id="CDR0000062764__294">Organ transplant recipients taking immunosuppressive drugs are at an elevated risk of developing skin cancer, particularly SCC.[<a class="bk_pop" href="#CDR0000062764_rl_146_8">8</a>,<a class="bk_pop" href="#CDR0000062764_rl_146_9">9</a>] Arsenic exposure also increases the risk of keratinocytic cancers [<a class="bk_pop" href="#CDR0000062764_rl_146_10">10</a>] and melanoma.[<a class="bk_pop" href="#CDR0000062764_rl_146_11">11</a>]</p><div id="CDR0000062764_rl_146"><h3>References</h3><ol><li><div class="bk_ref" id="CDR0000062764_rl_146_1">Preston DS, Stern RS: Nonmelanoma cancers of the skin. N Engl J Med 327 (23): 1649-62, 1992. [<a href="https://pubmed.ncbi.nlm.nih.gov/1435901" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 1435901</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_146_2">English DR, Armstrong BK, Kricker A, et al.: Case-control study of sun exposure and squamous cell carcinoma of the skin. Int J Cancer 77 (3): 347-53, 1998. [<a href="https://pubmed.ncbi.nlm.nih.gov/9663594" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 9663594</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_146_3">Gandini S, Sera F, Cattaruzza MS, et al.: Meta-analysis of risk factors for cutaneous melanoma: I. Common and atypical naevi. Eur J Cancer 41 (1): 28-44, 2005. [<a href="https://pubmed.ncbi.nlm.nih.gov/15617989" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 15617989</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_146_4">Armstrong BK, Cust AE: Sun exposure and skin cancer, and the puzzle of cutaneous melanoma: A perspective on Fears et al. Mathematical models of age and ultraviolet effects on the incidence of skin cancer among whites in the United States. American Journal of Epidemiology 1977; 105: 420-427. Cancer Epidemiol 48: 147-156, 2017. [<a href="https://pubmed.ncbi.nlm.nih.gov/28478931" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 28478931</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_146_5">Olsen CM, Pandeya N, Law MH, et al.: Does polygenic risk influence associations between sun exposure and melanoma? A prospective cohort analysis. Br J Dermatol 183 (2): 303-310, 2020. [<a href="https://pubmed.ncbi.nlm.nih.gov/31747047" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 31747047</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_146_6">Davis LE, Shalin SC, Tackett AJ: Current state of melanoma diagnosis and treatment. Cancer Biol Ther 20 (11): 1366-1379, 2019. [<a href="/pmc/articles/PMC6804807/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC6804807</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/31366280" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 31366280</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_146_7">Gershenwald JE, Guy GP: Stemming the Rising Incidence of Melanoma: Calling Prevention to Action. J Natl Cancer Inst 108 (1): , 2016. [<a href="/pmc/articles/PMC6048594/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC6048594</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/26563358" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 26563358</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_146_8">Ascha M, Ascha MS, Tanenbaum J, et al.: Risk Factors for Melanoma in Renal Transplant Recipients. JAMA Dermatol 153 (11): 1130-1136, 2017. [<a href="/pmc/articles/PMC5710441/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC5710441</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/28746700" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 28746700</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_146_9">Rollan MP, Cabrera R, Schwartz RA: Current knowledge of immunosuppression as a risk factor for skin cancer development. Crit Rev Oncol Hematol 177: 103754, 2022. [<a href="https://pubmed.ncbi.nlm.nih.gov/35803453" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 35803453</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_146_10">Tseng WP, Chu HM, How SW, et al.: Prevalence of skin cancer in an endemic area of chronic arsenicism in Taiwan. J Natl Cancer Inst 40 (3): 453-63, 1968. [<a href="https://pubmed.ncbi.nlm.nih.gov/5644201" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 5644201</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_146_11">Beane Freeman LE, Dennis LK, Lynch CF, et al.: Toenail arsenic content and cutaneous melanoma in Iowa. Am J Epidemiol 160 (7): 679-87, 2004. [<a href="https://pubmed.ncbi.nlm.nih.gov/15383412" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 15383412</span></a>]</div></li></ol></div></div><div id="CDR0000062764__213"><h2 id="_CDR0000062764__213_">Overview</h2><p id="CDR0000062764__2">Note: The Overview section summarizes the published evidence on this topic. The rest of the summary describes the evidence in more detail.</p><p id="CDR0000062764__283">Other PDQ summaries containing information related to skin cancer prevention include the following:</p><ul id="CDR0000062764__285"><li class="half_rhythm"><div>
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<a href="/books/n/pdqcis/CDR0000062750/">Skin Cancer Screening</a>
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</div></li><li class="half_rhythm"><div>
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<a href="/books/n/pdqcis/CDR0000062909/">Skin Cancer
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Treatment</a>
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</div></li><li class="half_rhythm"><div>
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<a href="/books/n/pdqcis/CDR0000552637/">Genetics of Skin Cancer</a>
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</div></li><li class="half_rhythm"><div>
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<a href="/books/n/pdqcis/CDR0000304747/">Levels of Evidence for Cancer Screening and Prevention Studies</a>
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</div></li></ul><div id="CDR0000062764__182"><h3>Factors Associated With an Increased Risk of Keratinocyte Carcinoma (Basal Cell Carcinoma, Squamous Cell Carcinoma)</h3><div id="CDR0000062764__218"><h4>Fair skin</h4><p id="CDR0000062764__219">Based on solid evidence, individuals with fair skin types (light or pale skin, light-hair and -eye color, freckles, or those who burn easily) are associated with an increased risk of squamous cell carcinoma (SCC) and basal cell carcinoma (BCC).</p><p id="CDR0000062764__220"><b>Magnitude of Effect</b>: Substantial, depending on the amount of exposure.</p><ul id="CDR0000062764__221" class="simple-list"><li class="half_rhythm"><div><b>Study Design</b>: Observational studies.</div></li><li class="half_rhythm"><div><b>Internal Validity</b>: Good.</div></li><li class="half_rhythm"><div><b>Consistency</b>: Good.</div></li><li class="half_rhythm"><div><b>External Validity</b>: Good.</div></li></ul></div><div id="CDR0000062764__183"><h4>Sun and ultraviolet (UV) radiation exposure</h4><p id="CDR0000062764__184">Based on solid evidence, sun and UV radiation exposure are associated with an increased risk of SCC and BCC.</p><p id="CDR0000062764__185"><b>Magnitude of Effect</b>: Substantial, depending on the amount of exposure.</p><ul id="CDR0000062764__150" class="simple-list"><li class="half_rhythm"><div><b>Study Design</b>: Observational studies.</div></li><li class="half_rhythm"><div><b>Internal Validity</b>: Good.</div></li><li class="half_rhythm"><div><b>Consistency</b>: Good.</div></li><li class="half_rhythm"><div><b>External Validity</b>: Good.</div></li></ul></div><div id="CDR0000062764__295"><h4>Immunosuppression</h4><p id="CDR0000062764__296">Based on solid evidence, immunosuppression after organ transplant is associated with an increased risk of SCC and BCC.</p><p id="CDR0000062764__297"><b>Magnitude of Effect</b>: Substantial, although not consistently quantitated.</p><ul id="CDR0000062764__298" class="simple-list"><li class="half_rhythm"><div><b>Study Design</b>: Observational studies.</div></li><li class="half_rhythm"><div><b>Internal Validity</b>: Good.</div></li><li class="half_rhythm"><div><b>Consistency</b>: Good.</div></li><li class="half_rhythm"><div><b>External Validity</b>: Good.</div></li></ul></div><div id="CDR0000062764__311"><h4>Arsenic exposure</h4><p id="CDR0000062764__300">Based on fair evidence, arsenic exposure is associated with an increased risk of keratinocyte carcinoma.</p><p id="CDR0000062764__301"><b>Magnitude of Effect</b>: Arsenic exposure is associated with keratinocyte carcinoma.</p><ul id="CDR0000062764__302" class="simple-list"><li class="half_rhythm"><div><b>Study Design</b>: One case-control study.</div></li><li class="half_rhythm"><div><b>Internal Validity</b>: Good.</div></li><li class="half_rhythm"><div><b>Consistency</b>: Fair.</div></li><li class="half_rhythm"><div><b>External Validity</b>: Fair.</div></li></ul></div></div><div id="CDR0000062764__186"><h3>Factors Associated With an Increased Risk of Melanoma</h3><div id="CDR0000062764__187"><h4>Sun and UV radiation exposure</h4><p id="CDR0000062764__188">Based on fair evidence, intermittent acute sun exposure leading to sunburn is associated with an increased risk of melanoma.</p><p id="CDR0000062764__189"><b>Magnitude of Effect</b>: Unknown.</p><ul id="CDR0000062764__163" class="simple-list"><li class="half_rhythm"><div><b>Study Design</b>: Observational studies.</div></li><li class="half_rhythm"><div><b>Internal Validity</b>: Fair.</div></li><li class="half_rhythm"><div><b>Consistency</b>: Fair.</div></li><li class="half_rhythm"><div><b>External Validity</b>: Poor.</div></li></ul></div><div id="CDR0000062764__299"><h4>Arsenic exposure</h4><p id="CDR0000062764__312">Based on fair evidence, arsenic exposure is associated with an increased risk of melanoma.</p><p id="CDR0000062764__313"><b>Magnitude of Effect</b>: Arsenic exposure is associated with double the incidence of melanoma.</p><ul id="CDR0000062764__314" class="simple-list"><li class="half_rhythm"><div><b>Study Design</b>: One case-control study.</div></li><li class="half_rhythm"><div><b>Internal Validity</b>: Good.</div></li><li class="half_rhythm"><div><b>Consistency</b>: Fair.</div></li><li class="half_rhythm"><div><b>External Validity</b>: Fair.</div></li></ul></div></div><div id="CDR0000062764__239"><h3>Interventions for Skin Cancer Prevention With Adequate Evidence</h3><div id="CDR0000062764__240"><h4>Treatment of sun-damaged skin to prevent skin cancer: Benefits</h4><p id="CDR0000062764__241">There is one well designed randomized controlled trial (RCT) that demonstrated the use of topical fluorouracil on sun-damaged skin prevents additional actinic keratoses and SCC requiring surgery.[<a class="bk_pop" href="#CDR0000062764_rl_213_1">1</a>]</p><p id="CDR0000062764__242"><b>Magnitude of Effect</b>: Moderate net benefit in preventing SCC requiring surgery.</p><ul id="CDR0000062764__243" class="simple-list"><li class="half_rhythm"><div><b>Study Design</b>: RCT.</div></li><li class="half_rhythm"><div><b>Internal Validity</b>: Good.</div></li><li class="half_rhythm"><div><b>Consistency</b>: N/A (single study).</div></li><li class="half_rhythm"><div><b>External Validity</b>: Fair.</div></li></ul></div><div id="CDR0000062764__244"><h4>Treatment of sun-damaged skin to prevent skin cancer: Harms</h4><p id="CDR0000062764__245">The primary side effect is local erythema, irritation, and crusting.</p></div></div><div id="CDR0000062764__151"><h3>Interventions for Skin Cancer Prevention With Inadequate Evidence</h3><div id="CDR0000062764__222"><h4>Behavior counseling to change sun-protection practices: Benefits</h4><p id="CDR0000062764__223">Evidence from 21 RCTs demonstrated that behavior counseling for children and families and for adults improves sun protective behaviors. These trials showed an inconsistent effect on reducing sunburns and do not provide direct evidence on reduction of SCC, BCC, or melanoma.[<a class="bk_pop" href="#CDR0000062764_rl_213_2">2</a>]</p><p id="CDR0000062764__226"><b>Magnitude of Benefit</b>: Moderate net benefit for improving sun protective behaviors, but there is inadequate direct evidence to determine the impact on the development of skin cancer.</p><ul id="CDR0000062764__228" class="simple-list"><li class="half_rhythm"><div><b>Study Design</b>: Systematic review including 21 RCTs.</div></li><li class="half_rhythm"><div><b>Internal Validity</b>: Good.</div></li><li class="half_rhythm"><div><b>Consistency</b>: Good for behaviors. Poor for sunburns.</div></li><li class="half_rhythm"><div><b>External Validity</b>: Good.</div></li></ul></div><div id="CDR0000062764__224"><h4>Behavior counseling to change sun-protection practices: Harms</h4><p id="CDR0000062764__225">Avoiding sun exposure can result in harms, such as mood disorders, sleep disturbances, elevated blood pressure, and impaired vitamin D metabolism, which is associated with increased incidence of colon, ovary, and breast cancers, and multiple myeloma.[<a class="bk_pop" href="#CDR0000062764_rl_213_3">3</a>]</p></div><div id="CDR0000062764__229"><h4>Topical treatments to prevent skin cancer—sunscreen: Benefits</h4><p id="CDR0000062764__231">Sunscreen has been shown to prevent sunburns and actinic keratoses. RCTs showed inconsistent benefit in preventing SCC and showed no benefit in preventing melanoma.</p><p id="CDR0000062764__232"><b>Magnitude of Effect</b>: Inadequate evidence to assess magnitude of effect for sunscreen.</p><ul id="CDR0000062764__236" class="simple-list"><li class="half_rhythm"><div><b>Study Design</b>: RCTs and observational cohort studies.</div></li><li class="half_rhythm"><div><b>Internal Validity</b>: Poor.</div></li><li class="half_rhythm"><div><b>Consistency</b>: Inconsistent.</div></li><li class="half_rhythm"><div><b>External Validity</b>: Poor.</div></li></ul></div><div id="CDR0000062764__233"><h4>Topical treatments to prevent skin cancer—sunscreen: Harms</h4><p id="CDR0000062764__235">Harms of sunscreen for the user are mild and mainly include skin allergic reactions. Because sunscreen use prevents sunburns, it may encourage more sun exposure to fair skinned people at risk for developing skin cancer.</p></div><div id="CDR0000062764__291"><h4>Systemic treatments to prevent skin cancer (nonsteroidal anti-inflammatory drugs [NSAIDs], nicotinamide, isotretinoin, selenium, beta carotene, alpha-difluoromethylornithine [DFMO]): Benefits</h4><p id="CDR0000062764__286">There is no evidence showing that NSAIDs and nicotinamide prevent SCC. RCTs found no benefit in preventing SCC, BCC, or melanoma for topical or oral retinoids, selenium, and beta carotene. One RCT showed a slight reduction in BCC for DFMO, but no change in SCC or melanoma.</p><p id="CDR0000062764__287"><b>Magnitude of Effect</b>: Inadequate evidence to assess magnitude of effect for topical retinoids, and nicotinamide. Harms likely outweigh potential benefits for NSAIDs, oral retinoids, beta carotene, and DFMO.</p><ul id="CDR0000062764__288" class="simple-list"><li class="half_rhythm"><div><b>Study Design</b>: RCTs and observational cohort studies.</div></li><li class="half_rhythm"><div><b>Internal Validity</b>: Poor.</div></li><li class="half_rhythm"><div><b>Consistency</b>: Inconsistent.</div></li><li class="half_rhythm"><div><b>External Validity</b>: Poor.</div></li></ul></div><div id="CDR0000062764__289"><h4>Systemic treatments to prevent skin cancer (NSAIDs, nicotinamide, isotretinoin, selenium, beta carotene, DFMO): Harms</h4><p id="CDR0000062764__290">NSAIDs are associated with adverse cardiovascular effects, gastrointestinal bleeding, and kidney damage. Oral retinoids are hepatotoxic and cause hypertriglyceridemia. Beta carotene is associated in RCTs with an increased risk of lung cancer incidence and mortality in smokers. Isotretinoin has dose-related skin toxicity. Patients discontinue DFMO at high rates because of hearing loss. </p></div></div><div id="CDR0000062764_rl_213"><h3>References</h3><ol><li><div class="bk_ref" id="CDR0000062764_rl_213_1">Weinstock MA, Thwin SS, Siegel JA, et al.: Chemoprevention of Basal and Squamous Cell Carcinoma With a Single Course of Fluorouracil, 5%, Cream: A Randomized Clinical Trial. JAMA Dermatol 154 (2): 167-174, 2018. [<a href="/pmc/articles/PMC5839275/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC5839275</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/29299592" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 29299592</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_213_2">Henrikson NB, Morrison CC, Blasi PR, et al.: Behavioral Counseling for Skin Cancer Prevention: Evidence Report and Systematic Review for the US Preventive Services Task Force. JAMA 319 (11): 1143-1157, 2018. [<a href="https://pubmed.ncbi.nlm.nih.gov/29558557" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 29558557</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_213_3">Mead MN: Benefits of sunlight: a bright spot for human health. Environ Health Perspect 116 (4): A160-7, 2008. [<a href="/pmc/articles/PMC2290997/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC2290997</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/18414615" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 18414615</span></a>]</div></li></ol></div></div><div id="CDR0000062764__107"><h2 id="_CDR0000062764__107_">Incidence and Mortality of Skin Cancer</h2><p id="CDR0000062764__108">There are two main types of skin cancer:</p><ul id="CDR0000062764__180"><li class="half_rhythm"><div>Keratinocyte carcinoma.<dl id="CDR0000062764__214" class="temp-labeled-list"><dt>-</dt><dd><p class="no_top_margin">Basal cell carcinoma (BCC).</p></dd><dt>-</dt><dd><p class="no_top_margin">Squamous cell carcinoma (SCC).</p></dd></dl></div></li><li class="half_rhythm"><div>Melanoma.</div></li></ul><p id="CDR0000062764__181">BCC and SCC are the most common forms of skin cancer but have substantially better prognoses than the less common, generally more aggressive, melanoma.</p><p id="CDR0000062764__109">Keratinocyte carcinomas are the most commonly occurring cancer in the United States, but exact incidence figures are unavailable because cases are not required to be reported to cancer registries. Incidence rates appear to have been increasing for a number of years,[<a class="bk_pop" href="#CDR0000062764_rl_107_1">1</a>] in part due to increased screening and biopsy of skin lesions. Based on an extrapolation of Medicare fee-for-service data to the U.S. population, about 3 million individuals were estimated to have been treated for keratinocyte carcinomas in 2023,[<a class="bk_pop" href="#CDR0000062764_rl_107_1">1</a>,<a class="bk_pop" href="#CDR0000062764_rl_107_2">2</a>] exceeding all other cancer cases (approximately 1.9 million) estimated by the American Cancer Society.[<a class="bk_pop" href="#CDR0000062764_rl_107_1">1</a>]</p><p id="CDR0000062764__110">Melanoma cases are reported to U.S. cancer registries, so data are available. In 2023, it is estimated that 97,610 individuals in the United States will be diagnosed with melanoma and approximately 7,990 will die of the disease.[<a class="bk_pop" href="#CDR0000062764_rl_107_1">1</a>] While only 2% of skin cancers are melanomas, melanoma causes more than 80% of deaths from skin cancer.[<a class="bk_pop" href="#CDR0000062764_rl_107_3">3</a>]</p><div id="CDR0000062764_rl_107"><h3>References</h3><ol><li><div class="bk_ref" id="CDR0000062764_rl_107_1">American Cancer Society: Cancer Facts and Figures 2023. American Cancer Society, 2023. <a href="https://www.cancer.org/content/dam/cancer-org/research/cancer-facts-and-statistics/annual-cancer-facts-and-figures/2023/2023-cancer-facts-and-figures.pdf" ref="pagearea=cite-ref&targetsite=external&targetcat=link&targettype=uri">Available online</a>. Last accessed Dec. 15, 2023.</div></li><li><div class="bk_ref" id="CDR0000062764_rl_107_2">Rogers HW, Weinstock MA, Feldman SR, et al.: Incidence Estimate of Nonmelanoma Skin Cancer (Keratinocyte Carcinomas) in the U.S. Population, 2012. JAMA Dermatol 151 (10): 1081-6, 2015. [<a href="https://pubmed.ncbi.nlm.nih.gov/25928283" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 25928283</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_107_3">Weinstock MA, Bogaars HA, Ashley M, et al.: Nonmelanoma skin cancer mortality. A population-based study. Arch Dermatol 127 (8): 1194-7, 1991. [<a href="https://pubmed.ncbi.nlm.nih.gov/1863078" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 1863078</span></a>]</div></li></ol></div></div><div id="CDR0000062764__303"><h2 id="_CDR0000062764__303_">Accuracy of Making a Clinical Diagnosis of Melanoma</h2><p id="CDR0000062764__304">Observer variability among physicians has been noted in the evaluation of skin lesions and subsequent biopsy specimens. A systematic review of 32 studies that compared the accuracy of dermatologists and primary care physicians in making a clinical diagnosis of melanoma concluded that there was no statistically significant difference in accuracy. However, the results were inconclusive, owing to small sample sizes and study design weaknesses.[<a class="bk_pop" href="#CDR0000062764_rl_303_1">1</a>] Subsequent studies have noted a higher accuracy for dermatologists in the diagnosis of melanocytic lesions,[<a class="bk_pop" href="#CDR0000062764_rl_303_2">2</a>,<a class="bk_pop" href="#CDR0000062764_rl_303_3">3</a>] yet there is a shortage of dermatologists to meet the demands of population-level screening.</p><p id="CDR0000062764__305">A study of 187 pathologists in the United States found that cases of moderately dysplastic nevi to early-stage invasive melanoma had less than 50% agreement with a reference diagnosis defined by consensus of experienced pathologists.[<a class="bk_pop" href="#CDR0000062764_rl_303_4">4</a>] At a U.S. population level, it is estimated that 82.8% (95% confidence interval, 81.0%–84.5%) of melanocytic skin biopsy diagnoses would be verified if they were reviewed by a consensus reference panel of experienced pathologists.[<a class="bk_pop" href="#CDR0000062764_rl_303_4">4</a>] In addition, differentiating between benign and malignant melanocytic tumors during histological examinations of biopsy specimens has been shown to be inconsistent, even in the hands of experienced dermatopathologists.[<a class="bk_pop" href="#CDR0000062764_rl_303_5">5</a>,<a class="bk_pop" href="#CDR0000062764_rl_303_6">6</a>] This variability in the diagnosis of melanocytic lesions undermines the results of studies that examine screening effectiveness and also may undermine the effectiveness of any screening intervention. Furthermore, this finding suggests that requesting a second opinion regarding the pathology of biopsy specimens may be important.[<a class="bk_pop" href="#CDR0000062764_rl_303_5">5</a>-<a class="bk_pop" href="#CDR0000062764_rl_303_7">7</a>] A standard approach to the classification of melanocytic skin lesions by pathologists may also reduce confusion and improve communication between clinicians.[<a class="bk_pop" href="#CDR0000062764_rl_303_4">4</a>,<a class="bk_pop" href="#CDR0000062764_rl_303_6">6</a>,<a class="bk_pop" href="#CDR0000062764_rl_303_8">8</a>,<a class="bk_pop" href="#CDR0000062764_rl_303_9">9</a>]</p><div id="CDR0000062764_rl_303"><h3>References</h3><ol><li><div class="bk_ref" id="CDR0000062764_rl_303_1">Chen SC, Bravata DM, Weil E, et al.: A comparison of dermatologists' and primary care physicians' accuracy in diagnosing melanoma: a systematic review. Arch Dermatol 137 (12): 1627-34, 2001. [<a href="https://pubmed.ncbi.nlm.nih.gov/11735713" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 11735713</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_303_2">Chen SC, Pennie ML, Kolm P, et al.: Diagnosing and managing cutaneous pigmented lesions: primary care physicians versus dermatologists. J Gen Intern Med 21 (7): 678-82, 2006. [<a href="/pmc/articles/PMC1924688/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC1924688</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/16808765" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 16808765</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_303_3">Corbo MD, Wismer J: Agreement between dermatologists and primary care practitioners in the diagnosis of malignant melanoma: review of the literature. J Cutan Med Surg 16 (5): 306-10, 2012 Sep-Oct. [<a href="https://pubmed.ncbi.nlm.nih.gov/22971304" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 22971304</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_303_4">Elmore JG, Barnhill RL, Elder DE, et al.: Pathologists' diagnosis of invasive melanoma and melanocytic proliferations: observer accuracy and reproducibility study. BMJ 357: j2813, 2017. [<a href="/pmc/articles/PMC5485913/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC5485913</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/28659278" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 28659278</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_303_5">Farmer ER, Gonin R, Hanna MP: Discordance in the histopathologic diagnosis of melanoma and melanocytic nevi between expert pathologists. Hum Pathol 27 (6): 528-31, 1996. [<a href="https://pubmed.ncbi.nlm.nih.gov/8666360" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 8666360</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_303_6">Lott JP, Elmore JG, Zhao GA, et al.: Evaluation of the Melanocytic Pathology Assessment Tool and Hierarchy for Diagnosis (MPATH-Dx) classification scheme for diagnosis of cutaneous melanocytic neoplasms: Results from the International Melanoma Pathology Study Group. J Am Acad Dermatol 75 (2): 356-63, 2016. [<a href="/pmc/articles/PMC4958559/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC4958559</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/27189823" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 27189823</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_303_7">Piepkorn MW, Longton GM, Reisch LM, et al.: Assessment of Second-Opinion Strategies for Diagnoses of Cutaneous Melanocytic Lesions. JAMA Netw Open 2 (10): e1912597, 2019. [<a href="/pmc/articles/PMC6804025/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC6804025</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/31603483" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 31603483</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_303_8">Piepkorn MW, Barnhill RL, Elder DE, et al.: The MPATH-Dx reporting schema for melanocytic proliferations and melanoma. J Am Acad Dermatol 70 (1): 131-41, 2014. [<a href="/pmc/articles/PMC3992990/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC3992990</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/24176521" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 24176521</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_303_9">Radick AC, Reisch LM, Shucard HL, et al.: Terminology for melanocytic skin lesions and the MPATH-Dx classification schema: A survey of dermatopathologists. J Cutan Pathol 48 (6): 733-738, 2021. [<a href="/pmc/articles/PMC7960566/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC7960566</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/32935869" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 32935869</span></a>]</div></li></ol></div></div><div id="CDR0000062764__172"><h2 id="_CDR0000062764__172_">Risk Factors for Skin Cancer</h2><p id="CDR0000062764__112">Epidemiological evidence
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suggests that exposure to ultraviolet (UV) radiation and the sensitivity of an
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individual’s skin to UV radiation are the main risk factors for skin cancer, although
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the type of exposure (high-intensity and short-duration vs. chronic exposure) and the pattern
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of exposure (continuous vs. intermittent) may differ among the two main skin cancer types.[<a class="bk_pop" href="#CDR0000062764_rl_172_1">1</a>-<a class="bk_pop" href="#CDR0000062764_rl_172_3">3</a>]</p><p id="CDR0000062764__306">The immune system plays a role in the pathogenesis of skin cancer: organ transplant recipients taking immunosuppressive drugs are at an elevated risk of skin cancer, both squamous cell carcinoma (SCC) and melanoma.[<a class="bk_pop" href="#CDR0000062764_rl_172_4">4</a>] Arsenic exposure also increases the risk of cutaneous SCC.[<a class="bk_pop" href="#CDR0000062764_rl_172_4">4</a>]</p><p id="CDR0000062764__113">The visible evidence of susceptibility to skin cancer (skin type and precancerous
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lesions), presence of sun-induced skin damage (sunburn and solar keratoses), and increased number of nevi and atypical nevi are associated with an increased risk of melanoma.[<a class="bk_pop" href="#CDR0000062764_rl_172_5">5</a>,<a class="bk_pop" href="#CDR0000062764_rl_172_6">6</a>]</p><div id="CDR0000062764__173"><h3>Factors Associated With Increased Risk of Keratinocyte Carcinoma </h3><div id="CDR0000062764__114"><h4>UV radiation exposure</h4><p id="CDR0000062764__115">Most evidence about UV radiation exposure and the prevention of skin cancer
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comes from observational and analytic epidemiological studies. Such studies have consistently shown that
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increased cumulative sun exposure is a risk factor for keratinocyte carcinomas.[<a class="bk_pop" href="#CDR0000062764_rl_172_2">2</a>,<a class="bk_pop" href="#CDR0000062764_rl_172_3">3</a>] Individuals whose skin tans poorly or burns easily after sun
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exposure are particularly susceptible.[<a class="bk_pop" href="#CDR0000062764_rl_172_2">2</a>]</p></div><div id="CDR0000062764__247"><h4>Actinic keratoses</h4><p id="CDR0000062764__248">It is generally felt that one-half or more of SCCs arise from actinic keratoses. However, nearly one-half of SCCs occur in clinically normal skin.[<a class="bk_pop" href="#CDR0000062764_rl_172_7">7</a>] A longitudinal study has shown that the progression rate from actinic keratoses to SCC is about 0.075% to 0.096% per year, or less than 1 case in 1,000 per year.[<a class="bk_pop" href="#CDR0000062764_rl_172_7">7</a>] Moreover, in a population-based longitudinal study, there was an approximately 26% spontaneous regression rate of actinic keratoses within 1 year of a screening examination.[<a class="bk_pop" href="#CDR0000062764_rl_172_8">8</a>]</p></div></div><div id="CDR0000062764__176"><h3>Factors Associated With an Increased Risk of Melanoma</h3><div id="CDR0000062764__118"><h4>UV radiation exposure</h4><p id="CDR0000062764__119">The relationship between UV radiation exposure and cutaneous melanoma is less
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clear than the relationship between UV exposure and keratinocyte carcinoma. In the case of melanoma, it seems that intermittent acute sun
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exposure leading to sunburn is more important than cumulative sun exposure;[<a class="bk_pop" href="#CDR0000062764_rl_172_9">9</a>] such exposures during childhood or
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adolescence may be particularly important.[<a class="bk_pop" href="#CDR0000062764_rl_172_1">1</a>]</p><p id="CDR0000062764__282">Multiple case control studies have also documented the association between sun exposure and melanoma. Total sun exposure in childhood is associated with an increased risk for melanoma (odds ratio, 1.81–4.4) as is recreational sun exposure during childhood and adulthood, while occupational sun exposure may be associated with a decreased risk for melanoma.[<a class="bk_pop" href="#CDR0000062764_rl_172_10">10</a>,<a class="bk_pop" href="#CDR0000062764_rl_172_11">11</a>]
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Fair skin that sunburns easily has a twofold risk of melanoma compared with skin phenotypes that never burn. Natural red and blond hair and natural blond hair also confers a twofold to fourfold increased risk of melanoma.[<a class="bk_pop" href="#CDR0000062764_rl_172_12">12</a>]</p></div></div><div id="CDR0000062764_rl_172"><h3>References</h3><ol><li><div class="bk_ref" id="CDR0000062764_rl_172_1">Koh HK: Cutaneous melanoma. N Engl J Med 325 (3): 171-82, 1991. [<a href="https://pubmed.ncbi.nlm.nih.gov/1805813" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 1805813</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_172_2">Preston DS, Stern RS: Nonmelanoma cancers of the skin. N Engl J Med 327 (23): 1649-62, 1992. [<a href="https://pubmed.ncbi.nlm.nih.gov/1435901" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 1435901</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_172_3">English DR, Armstrong BK, Kricker A, et al.: Case-control study of sun exposure and squamous cell carcinoma of the skin. Int J Cancer 77 (3): 347-53, 1998. [<a href="https://pubmed.ncbi.nlm.nih.gov/9663594" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 9663594</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_172_4">Beane Freeman LE, Dennis LK, Lynch CF, et al.: Toenail arsenic content and cutaneous melanoma in Iowa. Am J Epidemiol 160 (7): 679-87, 2004. [<a href="https://pubmed.ncbi.nlm.nih.gov/15383412" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 15383412</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_172_5">Gandini S, Sera F, Cattaruzza MS, et al.: Meta-analysis of risk factors for cutaneous melanoma: I. Common and atypical naevi. Eur J Cancer 41 (1): 28-44, 2005. [<a href="https://pubmed.ncbi.nlm.nih.gov/15617989" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 15617989</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_172_6">Cho E, Rosner BA, Colditz GA: Risk factors for melanoma by body site. Cancer Epidemiol Biomarkers Prev 14 (5): 1241-4, 2005. [<a href="https://pubmed.ncbi.nlm.nih.gov/15894679" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 15894679</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_172_7">Marks R, Rennie G, Selwood TS: Malignant transformation of solar keratoses to squamous cell carcinoma. Lancet 1 (8589): 795-7, 1988. [<a href="https://pubmed.ncbi.nlm.nih.gov/2895318" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 2895318</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_172_8">Marks R, Foley P, Goodman G, et al.: Spontaneous remission of solar keratoses: the case for conservative management. Br J Dermatol 115 (6): 649-55, 1986. [<a href="https://pubmed.ncbi.nlm.nih.gov/3801305" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 3801305</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_172_9">Gandini S, Sera F, Cattaruzza MS, et al.: Meta-analysis of risk factors for cutaneous melanoma: II. Sun exposure. Eur J Cancer 41 (1): 45-60, 2005. [<a href="https://pubmed.ncbi.nlm.nih.gov/15617990" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 15617990</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_172_10">Lin JS, Eder M, Weinmann S, et al.: Behavioral Counseling to Prevent Skin Cancer: Systematic Evidence Review to Update the 2003 U.S. Preventive Services Task Force Recommendation. Agency for Healthcare Research and Quality, 2011. Report No.: 11-05152-EF-1. <a href="https://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0009693/pdf/PubMedHealth_PMH0009693.pdf" ref="pagearea=cite-ref&targetsite=external&targetcat=link&targettype=uri">Also available online</a>. Last accessed December 8, 2023. [<a href="https://pubmed.ncbi.nlm.nih.gov/21542545" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 21542545</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_172_11">Henrikson NB, Morrison CC, Blasi PR, et al.: Behavioral Counseling for Skin Cancer Prevention: Evidence Report and Systematic Review for the US Preventive Services Task Force. JAMA 319 (11): 1143-1157, 2018. [<a href="https://pubmed.ncbi.nlm.nih.gov/29558557" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 29558557</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_172_12">Gandini S, Sera F, Cattaruzza MS, et al.: Meta-analysis of risk factors for cutaneous melanoma: III. Family history, actinic damage and phenotypic factors. Eur J Cancer 41 (14): 2040-59, 2005. [<a href="https://pubmed.ncbi.nlm.nih.gov/16125929" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 16125929</span></a>]</div></li></ol></div></div><div id="CDR0000062764__267"><h2 id="_CDR0000062764__267_">Interventions for Skin Cancer Prevention With Adequate Evidence of Benefit</h2><div id="CDR0000062764__268"><h3>Treatment of Sun-Damaged Skin to Prevent Skin Cancer</h3><div id="CDR0000062764__269"><h4>Topical fluorouracil</h4><p id="CDR0000062764__270">Daily application of topical fluorouracil for up to 4 weeks onto actinic keratosis has been shown to reduce the development of new actinic keratoses.[<a class="bk_pop" href="#CDR0000062764_rl_267_1">1</a>,<a class="bk_pop" href="#CDR0000062764_rl_267_2">2</a>] A randomized controlled trial of 932 veterans with sun-damaged skin (two or more keratinocyte carcinomas in the 5 years prior to enrollment), randomly assigned participants to a 2- to 4-week single course of 5% topical fluorouracil. The fluorouracil group had fewer actinic keratosis cases when compared with the control group at 6 months (3.0 vs. 8.1; <i>P</i> < .001) and for the overall study duration (<i>P</i> < .001). Topical fluorouracil also reduced the risk of squamous cell carcinoma (SCC) requiring surgery at those sites for 1 year, but no effect was seen on basal cell carcinoma (BCC) in year 1 or on SCC or BCC over 4 years. Erythema, crusting, and irritation were reported by 82% of participants, with 40% reporting symptoms as severe. However, at study completion, 87% reported a willingness to repeat the treatment if needed.[<a class="bk_pop" href="#CDR0000062764_rl_267_1">1</a>] </p></div></div><div id="CDR0000062764_rl_267"><h3>References</h3><ol><li><div class="bk_ref" id="CDR0000062764_rl_267_1">Weinstock MA, Thwin SS, Siegel JA, et al.: Chemoprevention of Basal and Squamous Cell Carcinoma With a Single Course of Fluorouracil, 5%, Cream: A Randomized Clinical Trial. JAMA Dermatol 154 (2): 167-174, 2018. [<a href="/pmc/articles/PMC5839275/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC5839275</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/29299592" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 29299592</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_267_2">Rosenberg AR, Tabacchi M, Ngo KH, et al.: Skin cancer precursor immunotherapy for squamous cell carcinoma prevention. JCI Insight 4 (6): , 2019. [<a href="/pmc/articles/PMC6483001/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC6483001</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/30895944" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 30895944</span></a>]</div></li></ol></div></div><div id="CDR0000062764__174"><h2 id="_CDR0000062764__174_">Interventions for Skin Cancer Prevention With Inadequate Evidence of Benefit</h2><div id="CDR0000062764__129"><h3>Behavioral Interventions to Change Sun-Protective Practices</h3><p id="CDR0000062764__130">The U.S. Preventive Services Task Force (USPSTF) commissioned a systematic review of primary care behavioral counseling interventions for skin cancer prevention.[<a class="bk_pop" href="#CDR0000062764_rl_174_1">1</a>] The review identified 21 trials on promoting protective behaviors in 27 publications with 20,561 participants. Protective behaviors included use of protective clothing to limit ultraviolet (UV) radiation exposure, sun avoidance behaviors, and use of sunscreen. Interventions included physician counseling, tailored mailings and texts, educational presentations, and interactive web programs involving patients and families. Five of six trials in children found that interventions reduced parent-reported composite sun protection scores at 3 months to 3 years.[<a class="bk_pop" href="#CDR0000062764_rl_174_2">2</a>-<a class="bk_pop" href="#CDR0000062764_rl_174_6">6</a>] Six of twelve trials in adults also showed that interventions resulted in a reduced patient-reported composite sun protection score, with the greatest change being increased use of sunscreen.[<a class="bk_pop" href="#CDR0000062764_rl_174_7">7</a>-<a class="bk_pop" href="#CDR0000062764_rl_174_13">13</a>]</p><p id="CDR0000062764__249">The trials did not show a consistent change in sunburns for children or adults. In the three trials of children that assessed changes in sunburn frequency (n = 2,508),[<a class="bk_pop" href="#CDR0000062764_rl_174_14">14</a>-<a class="bk_pop" href="#CDR0000062764_rl_174_16">16</a>] only one trial showed a reduction in nonsevere burns, but no change in severe burns.[<a class="bk_pop" href="#CDR0000062764_rl_174_15">15</a>] In the six trials of adults that assessed changes in sunburn frequency (n = 3,959),[<a class="bk_pop" href="#CDR0000062764_rl_174_17">17</a>-<a class="bk_pop" href="#CDR0000062764_rl_174_22">22</a>] only one trial showed a slight reduction in red or painful burns at 3 months.[<a class="bk_pop" href="#CDR0000062764_rl_174_17">17</a>] There were no changes reported in any trial showing reductions in skin cancer (keratinocyte carcinoma or melanoma) or skin cancer precursors (nevi or actinic keratosis).</p><p id="CDR0000062764__250">While direct evidence is lacking, the USPSTF linked the evidence demonstrating that behavioral counseling interventions promote sun protective practices with the epidemiological data on UV exposure and skin cancer prevalence. This led to a recommendation for counseling children, adolescents, and young adults aged 6 months to 24 years and adults older than 24 years with fair skin on protective practices to reduce skin cancer.[<a class="bk_pop" href="#CDR0000062764_rl_174_23">23</a>] </p></div><div id="CDR0000062764__175"><h3>Topical Treatment to Prevent Skin Cancer—Sunscreen</h3><p id="CDR0000062764__310">Sunscreen use has been shown to decrease the rate of developing new actinic keratoses [<a class="bk_pop" href="#CDR0000062764_rl_174_24">24</a>] and to increase the remission rate of existing lesions.[<a class="bk_pop" href="#CDR0000062764_rl_174_25">25</a>] Another trial found no difference in keratinocyte cancers in daily versus discretionary sunscreen users.[<a class="bk_pop" href="#CDR0000062764_rl_174_26">26</a>] An 8-year observational post-trial follow-up showed reductions in both squamous cancers [<a class="bk_pop" href="#CDR0000062764_rl_174_27">27</a>] and melanomas [<a class="bk_pop" href="#CDR0000062764_rl_174_28">28</a>] associated with sunscreen use, but the confidence intervals (CIs) were very wide, and the participation outside the initial trial introduced uncertainty.</p><p id="CDR0000062764__255">A meta-analysis of 18 studies that explored the association between melanoma risk and previous sunscreen use illustrated widely differing study qualities and suggested little or no association.[<a class="bk_pop" href="#CDR0000062764_rl_174_29">29</a>] A systematic review of the association between sunscreen use and the development of melanocytic nevi in children reported similar issues with study quality and heterogeneity, hindering conclusive assessments. However, of the 15 studies that met inclusion criteria, 12 found either an increased incidence or no association.[<a class="bk_pop" href="#CDR0000062764_rl_174_30">30</a>]</p></div><div id="CDR0000062764__293"><h3>Systemic Medications to Prevent Skin Cancer</h3><div id="CDR0000062764__256"><h4>Nonsteroidal anti-inflammatory drugs (NSAIDS)</h4><p id="CDR0000062764__257">A randomized controlled trial (RCT) included 240 people at high risk of skin cancer (each with 10–40 actinic keratoses and a history of previous skin cancer) who were given celecoxib 200 mg twice daily or a placebo for 9 months. The trial found no difference in the incidence of actinic keratosis, but a post hoc analysis revealed a statistically significant difference in the mean number of keratinocyte carcinomas per patient (rate ratio, 0.43; 95% CI, 0.24–0.75; absolute difference, 0.2 lesions per patient).[<a class="bk_pop" href="#CDR0000062764_rl_174_31">31</a>] A meta-analysis of nine studies (five case-control, three cohort, and one intervention) reported a small reduction in squamous cell carcinoma (SCC) risk associated with the use of nonaspirin NSAIDs (relative risk [RR], 0.85; 95% CI, 0.78–0.94), with the effect seen particularly in those with previous actinic skin tumors.[<a class="bk_pop" href="#CDR0000062764_rl_174_32">32</a>]</p><p id="CDR0000062764__258">NSAIDs are associated with known adverse cardiovascular effects, gastrointestinal bleeding, and kidney damage.[<a class="bk_pop" href="#CDR0000062764_rl_174_33">33</a>]</p></div><div id="CDR0000062764__259"><h4>Nicotinamide (vitamin B3)</h4><p id="CDR0000062764__260">The effect of nicotinamide on the development of new actinic keratosis lesions has been studied with inadequate evidence for efficacy, even in higher-risk populations. Studies include a clinical trial of patients with four or fewer actinic keratosis lesions at baseline (Oral Nicotinamide to Reduce Actinic Cancer [ONTRAC]) [<a class="bk_pop" href="#CDR0000062764_rl_174_34">34</a>] and a trial of immunosuppressed organ-transplant recipients (Oral Nicotinamide to Reduce Actinic Cancer after Transplant [ONTRANS]).[<a class="bk_pop" href="#CDR0000062764_rl_174_35">35</a>] The ONTRAC trial showed a lower rate of new lesions while individuals received treatment, but not during the 6-month postintervention follow-up period.[<a class="bk_pop" href="#CDR0000062764_rl_174_36">36</a>] The ONTRANS trial was impacted by slow recruitment and was stopped early but showed no efficacy in the limited sample size.</p></div><div id="CDR0000062764__261"><h4>Isotretinoin and related systemic retinoids such as acitretin</h4><p id="CDR0000062764__262">Retinoids are vitamin A derivatives that are available in topical and oral preparations. Oral retinoids have been studied in high-risk populations, such as those with a history of multiple nonmelanoma skin cancers, genetic disorders such as xeroderma pigmentosum, transplant recipients, and those exposed to high cumulative levels of psoralen plus ultraviolet A (PUVA) therapy.[<a class="bk_pop" href="#CDR0000062764_rl_174_37">37</a>-<a class="bk_pop" href="#CDR0000062764_rl_174_43">43</a>] However, side effects of oral retinoids, including hypertriglyceridemia and hepatic toxicity, are significant.</p><p id="CDR0000062764__263">Topical tretinoin 0.1% cream was compared with a control for 1.5 to 5.5 years in an RCT. No difference was found in the proportions of patients who developed SCC or basal cell carcinoma (BCC) or actinic keratosis.[<a class="bk_pop" href="#CDR0000062764_rl_174_44">44</a>]</p></div><div id="CDR0000062764__264"><h4>Selenium</h4><p id="CDR0000062764__265">A multicenter, double-blind, randomized, placebo-controlled trial of 1,312
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patients with a history of BCC or SCC and a mean
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follow-up of 6.4 years showed that 200 µg of selenium (in brewer’s yeast tablets)
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did not have a statistically significant effect on the primary end point of
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BCC development, but instead increased the risk of SCC and total keratinocyte carcinomas (unadjusted RR, 1.27; 95% CI, 1.11–1.45).[<a class="bk_pop" href="#CDR0000062764_rl_174_45">45</a>,<a class="bk_pop" href="#CDR0000062764_rl_174_46">46</a>]</p></div><div id="CDR0000062764__271"><h4>Beta carotene</h4><p id="CDR0000062764__272">In the Physicians’ Health Study, 21,884 male physicians with no reported history of BCC or SCC were randomly assigned to take 50 mg doses of daily oral beta carotene versus placebo in a 2 × 2 factorial trial of beta carotene and aspirin.[<a class="bk_pop" href="#CDR0000062764_rl_174_47">47</a>] After 12 years, there was no difference in incidence of either BCC or SCC between the beta carotene and placebo groups. Similar findings were noted in 10 years and 14 years of follow-up among the participants in the Nurses’ Health Study and the Health Professionals Follow-up Study.[<a class="bk_pop" href="#CDR0000062764_rl_174_48">48</a>] Reanalysis of data from these two cohorts after an additional 16 years of follow-up noted higher intake of some carotenoids was associated with a modest reduction in SCC risk.[<a class="bk_pop" href="#CDR0000062764_rl_174_49">49</a>] Data on the use of sun protection behaviors were not available, and as participants with higher intake tended to have higher levels of physical activity, lower smoking, and alcohol consumption, it is possible that there was a confounding effect of sun protection behaviors. RCTs
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of long-term treatment with beta carotene in individuals previously treated for
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keratinocyte carcinoma also showed no benefit in preventing the occurrence of new keratinocyte carcinomas.[<a class="bk_pop" href="#CDR0000062764_rl_174_26">26</a>,<a class="bk_pop" href="#CDR0000062764_rl_174_50">50</a>]</p><p id="CDR0000062764__273">Several RCTs show that beta carotene supplementation can increase cardiovascular disease mortality and increase the risk of lung cancer.[<a class="bk_pop" href="#CDR0000062764_rl_174_51">51</a>,<a class="bk_pop" href="#CDR0000062764_rl_174_52">52</a>]</p></div><div id="CDR0000062764__274"><h4>Alpha-difluoromethylornithine (DFMO)</h4><p id="CDR0000062764__275">An RCT of oral DFMO (500 mg/m<sup>2</sup>/day) versus placebo for up to 5 years (n = 250 participants) showed no difference in the number of new keratinocyte carcinomas.[<a class="bk_pop" href="#CDR0000062764_rl_174_53">53</a>] A subset analysis showed a difference in BCC events favoring the DFMO group (0.28 vs. 0.40 per year; <i>P</i> = .03) but no difference in SCC rates. However, the DFMO group experienced greater hearing loss than the placebo group (4 dB vs. 2 dB, <i>P</i> = .003), resulting in a higher study drug discontinuation rate (10.8% vs. 4.5%). </p></div></div><div id="CDR0000062764_rl_174"><h3>References</h3><ol><li><div class="bk_ref" id="CDR0000062764_rl_174_1">Henrikson NB, Morrison CC, Blasi PR, et al.: Behavioral Counseling for Skin Cancer Prevention: Evidence Report and Systematic Review for the US Preventive Services Task Force. JAMA 319 (11): 1143-1157, 2018. [<a href="https://pubmed.ncbi.nlm.nih.gov/29558557" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 29558557</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_174_2">Crane LA, Deas A, Mokrohisky ST, et al.: A randomized intervention study of sun protection promotion in well-child care. Prev Med 42 (3): 162-70, 2006. 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N Engl J Med 352 (11): 1071-80, 2005. [<a href="https://pubmed.ncbi.nlm.nih.gov/15713944" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 15713944</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_174_33">Bhala N, Emberson J, Merhi A, et al.: Vascular and upper gastrointestinal effects of non-steroidal anti-inflammatory drugs: meta-analyses of individual participant data from randomised trials. Lancet 382 (9894): 769-79, 2013. [<a href="/pmc/articles/PMC3778977/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC3778977</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/23726390" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 23726390</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_174_34">Surjana D, Halliday GM, Martin AJ, et al.: Oral nicotinamide reduces actinic keratoses in phase II double-blinded randomized controlled trials. J Invest Dermatol 132 (5): 1497-500, 2012. [<a href="https://pubmed.ncbi.nlm.nih.gov/22297641" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 22297641</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_174_35">Allen NC, Martin AJ, Snaidr VA, et al.: Nicotinamide for Skin-Cancer Chemoprevention in Transplant Recipients. N Engl J Med 388 (9): 804-812, 2023. [<a href="https://pubmed.ncbi.nlm.nih.gov/36856616" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 36856616</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_174_36">Chen AC, Martin AJ, Choy B, et al.: A Phase 3 Randomized Trial of Nicotinamide for Skin-Cancer Chemoprevention. N Engl J Med 373 (17): 1618-26, 2015. [<a href="https://pubmed.ncbi.nlm.nih.gov/26488693" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 26488693</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_174_37">Nijsten TE, Stern RS: Oral retinoid use reduces cutaneous squamous cell carcinoma risk in patients with psoriasis treated with psoralen-UVA: a nested cohort study. J Am Acad Dermatol 49 (4): 644-50, 2003. [<a href="https://pubmed.ncbi.nlm.nih.gov/14512910" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 14512910</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_174_38">DiGiovanna JJ: Retinoid chemoprevention in patients at high risk for skin cancer. Med Pediatr Oncol 36 (5): 564-7, 2001. [<a href="https://pubmed.ncbi.nlm.nih.gov/11340613" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 11340613</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_174_39">Moon TE, Levine N, Cartmel B, et al.: Effect of retinol in preventing squamous cell skin cancer in moderate-risk subjects: a randomized, double-blind, controlled trial. Southwest Skin Cancer Prevention Study Group. Cancer Epidemiol Biomarkers Prev 6 (11): 949-56, 1997. [<a href="https://pubmed.ncbi.nlm.nih.gov/9367069" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 9367069</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_174_40">Kraemer KH, DiGiovanna JJ, Moshell AN, et al.: Prevention of skin cancer in xeroderma pigmentosum with the use of oral isotretinoin. N Engl J Med 318 (25): 1633-7, 1988. [<a href="https://pubmed.ncbi.nlm.nih.gov/3287161" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 3287161</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_174_41">Kraemer KH, DiGiovanna JJ, Peck GL: Chemoprevention of skin cancer in xeroderma pigmentosum. J Dermatol 19 (11): 715-8, 1992.</div></li><li><div class="bk_ref" id="CDR0000062764_rl_174_42">McKenna DB, Murphy GM: Skin cancer chemoprophylaxis in renal transplant recipients: 5 years of experience using low-dose acitretin. Br J Dermatol 140 (4): 656-60, 1999. [<a href="https://pubmed.ncbi.nlm.nih.gov/10233316" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 10233316</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_174_43">Harwood CA, Leedham-Green M, Leigh IM, et al.: Low-dose retinoids in the prevention of cutaneous squamous cell carcinomas in organ transplant recipients: a 16-year retrospective study. Arch Dermatol 141 (4): 456-64, 2005. [<a href="https://pubmed.ncbi.nlm.nih.gov/15837863" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 15837863</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_174_44">Weinstock MA, Bingham SF, Digiovanna JJ, et al.: Tretinoin and the prevention of keratinocyte carcinoma (Basal and squamous cell carcinoma of the skin): a veterans affairs randomized chemoprevention trial. J Invest Dermatol 132 (6): 1583-90, 2012. [<a href="https://pubmed.ncbi.nlm.nih.gov/22318383" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 22318383</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_174_45">Clark LC, Combs GF, Turnbull BW, et al.: Effects of selenium supplementation for cancer prevention in patients with carcinoma of the skin. A randomized controlled trial. Nutritional Prevention of Cancer Study Group. JAMA 276 (24): 1957-63, 1996. [<a href="https://pubmed.ncbi.nlm.nih.gov/8971064" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 8971064</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_174_46">Duffield-Lillico AJ, Slate EH, Reid ME, et al.: Selenium supplementation and secondary prevention of nonmelanoma skin cancer in a randomized trial. J Natl Cancer Inst 95 (19): 1477-81, 2003. [<a href="https://pubmed.ncbi.nlm.nih.gov/14519754" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 14519754</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_174_47">Frieling UM, Schaumberg DA, Kupper TS, et al.: A randomized, 12-year primary-prevention trial of beta carotene supplementation for nonmelanoma skin cancer in the physician's health study. Arch Dermatol 136 (2): 179-84, 2000. [<a href="https://pubmed.ncbi.nlm.nih.gov/10677093" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 10677093</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_174_48">Fung TT, Spiegelman D, Egan KM, et al.: Vitamin and carotenoid intake and risk of squamous cell carcinoma of the skin. Int J Cancer 103 (1): 110-5, 2003. [<a href="https://pubmed.ncbi.nlm.nih.gov/12455062" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 12455062</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_174_49">Kim J, Park MK, Li WQ, et al.: Association of Vitamin A Intake With Cutaneous Squamous Cell Carcinoma Risk in the United States. JAMA Dermatol 155 (11): 1260-1268, 2019. [<a href="/pmc/articles/PMC6669777/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC6669777</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/31365038" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 31365038</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_174_50">Greenberg ER, Baron JA, Stukel TA, et al.: A clinical trial of beta carotene to prevent basal-cell and squamous-cell cancers of the skin. The Skin Cancer Prevention Study Group. N Engl J Med 323 (12): 789-95, 1990. [<a href="https://pubmed.ncbi.nlm.nih.gov/2202901" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 2202901</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_174_51">Omenn GS, Goodman GE, Thornquist MD, et al.: Effects of a combination of beta carotene and vitamin A on lung cancer and cardiovascular disease. N Engl J Med 334 (18): 1150-5, 1996. [<a href="https://pubmed.ncbi.nlm.nih.gov/8602180" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 8602180</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_174_52">The effect of vitamin E and beta carotene on the incidence of lung cancer and other cancers in male smokers. The Alpha-Tocopherol, Beta Carotene Cancer Prevention Study Group. N Engl J Med 330 (15): 1029-35, 1994. [<a href="https://pubmed.ncbi.nlm.nih.gov/8127329" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 8127329</span></a>]</div></li><li><div class="bk_ref" id="CDR0000062764_rl_174_53">Bailey HH, Kim K, Verma AK, et al.: A randomized, double-blind, placebo-controlled phase 3 skin cancer prevention study of {alpha}-difluoromethylornithine in subjects with previous history of skin cancer. Cancer Prev Res (Phila) 3 (1): 35-47, 2010. [<a href="/pmc/articles/PMC2804946/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC2804946</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/20051371" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 20051371</span></a>]</div></li></ol></div></div><div id="CDR0000062764__30"><h2 id="_CDR0000062764__30_">Latest Updates to This Summary (12/08/2023)</h2><p id="CDR0000062764__32">The PDQ cancer information summaries are reviewed regularly and updated as
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new information becomes available. This section describes the latest
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changes made to this summary as of the date above.</p><p id="CDR0000062764__318">
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<b>
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<a href="#CDR0000062764__174">Interventions for Skin Cancer Prevention With Inadequate Evidence of Benefit</a>
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</b>
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</p><p id="CDR0000062764__319">The <a href="#CDR0000062764__259">Nicotinamide (vitamin B3)</a> subsection was extensively revised.</p><p id="CDR0000062764__disclaimerHP_3">This summary is written and maintained by the <a href="https://www.cancer.gov/publications/pdq/editorial-boards/screening-prevention" ref="pagearea=body&targetsite=external&targetcat=link&targettype=uri">PDQ Screening and Prevention Editorial Board</a>, which is
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editorially independent of NCI. The summary reflects an independent review of
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the literature and does not represent a policy statement of NCI or NIH. More
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information about summary policies and the role of the PDQ Editorial Boards in
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maintaining the PDQ summaries can be found on the <a href="#CDR0000062764__AboutThis_1">About This PDQ Summary</a> and <a href="https://www.cancer.gov/publications/pdq" ref="pagearea=body&targetsite=external&targetcat=link&targettype=uri">PDQ® Cancer Information for Health Professionals</a> pages.
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</p></div><div id="CDR0000062764__AboutThis_1"><h2 id="_CDR0000062764__AboutThis_1_">About This PDQ Summary</h2><div id="CDR0000062764__AboutThis_2"><h3>Purpose of This Summary</h3><p id="CDR0000062764__AboutThis_3">This PDQ cancer information summary for health professionals provides comprehensive, peer-reviewed, evidence-based information about skin cancer prevention. It is intended as a resource to inform and assist clinicians in the care of their patients. It does not provide formal guidelines or recommendations for making health care decisions.</p></div><div id="CDR0000062764__AboutThis_4"><h3>Reviewers and Updates</h3><p id="CDR0000062764__AboutThis_5">This summary is reviewed regularly and updated as necessary by the <a href="https://www.cancer.gov/publications/pdq/editorial-boards/screening-prevention" ref="pagearea=body&targetsite=external&targetcat=link&targettype=uri">PDQ Screening and Prevention Editorial Board</a>, which is editorially independent of the National Cancer Institute (NCI). The summary reflects an independent review of the literature and does not represent a policy statement of NCI or the National Institutes of Health (NIH).</p><p id="CDR0000062764__AboutThis_22"> Board members review recently published articles each month to determine whether an article should:</p><ul id="CDR0000062764__AboutThis_6"><li class="half_rhythm"><div>be discussed at a meeting,</div></li><li class="half_rhythm"><div>be cited with text, or</div></li><li class="half_rhythm"><div>replace or update an existing article that is already cited.</div></li></ul><p id="CDR0000062764__AboutThis_7">Changes to the summaries are made through a consensus process in which Board members evaluate the strength of the evidence in the published articles and determine how the article should be included in the summary.</p><p id="CDR0000062764__AboutThis_9">Any comments or questions about the summary content should be submitted to Cancer.gov through the NCI website's <a href="https://www.cancer.gov/contact/email-us" ref="pagearea=body&targetsite=external&targetcat=link&targettype=uri">Email Us</a>. Do not contact the individual Board Members with questions or comments about the summaries. Board members will not respond to individual inquiries.</p></div><div id="CDR0000062764__AboutThis_10"><h3>Levels of Evidence</h3><p id="CDR0000062764__AboutThis_11">Some of the reference citations in this summary are accompanied by a level-of-evidence designation. These designations are intended to help readers assess the strength of the evidence supporting the use of specific interventions or approaches. The PDQ Screening and Prevention Editorial Board uses a <a href="/books/n/pdqcis/CDR0000304747/">formal evidence ranking system</a> in developing its level-of-evidence designations.</p></div><div id="CDR0000062764__AboutThis_12"><h3>Permission to Use This Summary</h3><p id="CDR0000062764__AboutThis_13">PDQ is a registered trademark. Although the content of PDQ documents can be used freely as text, it cannot be identified as an NCI PDQ cancer information summary unless it is presented in its entirety and is regularly updated. However, an author would be permitted to write a sentence such as “NCI’s PDQ cancer information summary about breast cancer prevention states the risks succinctly: [include excerpt from the summary].”</p><p id="CDR0000062764__AboutThis_14">The preferred citation for this PDQ summary is:</p><p id="CDR0000062764__AboutThis_15">PDQ® Screening and Prevention Editorial Board. PDQ Skin Cancer Prevention. Bethesda, MD: National Cancer Institute. Updated <MM/DD/YYYY>. Available at: <a href="https://www.cancer.gov/types/skin/hp/skin-prevention-pdq" ref="pagearea=body&targetsite=external&targetcat=link&targettype=uri">https://www.cancer.gov/types/skin/hp/skin-prevention-pdq</a>. Accessed <MM/DD/YYYY>. [PMID: 26389494]</p><p id="CDR0000062764__AboutThis_16">Images in this summary are used with permission of the author(s), artist, and/or publisher for use within the PDQ summaries only. Permission to use images outside the context of PDQ information must be obtained from the owner(s) and cannot be granted by the National Cancer Institute. Information about using the illustrations in this summary, along with many other cancer-related images, is available in <a href="https://visualsonline.cancer.gov/" ref="pagearea=body&targetsite=external&targetcat=link&targettype=uri">Visuals Online</a>, a collection of over 2,000 scientific images.
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</p></div><div id="CDR0000062764__AboutThis_17"><h3>Disclaimer</h3><p id="CDR0000062764__AboutThis_19">The information in these summaries should not be used as a basis for insurance reimbursement determinations. More information on insurance coverage is available on Cancer.gov on the <a href="https://www.cancer.gov/about-cancer/managing-care" ref="pagearea=body&targetsite=external&targetcat=link&targettype=uri">Managing Cancer Care</a> page.</p></div><div id="CDR0000062764__AboutThis_20"><h3>Contact Us</h3><p id="CDR0000062764__AboutThis_21">More information about contacting us or receiving help with the Cancer.gov website can be found on our <a href="https://www.cancer.gov/contact" ref="pagearea=body&targetsite=external&targetcat=link&targettype=uri">Contact Us for Help</a> page. Questions can also be submitted to Cancer.gov through the website’s <a href="https://www.cancer.gov/contact/email-us" ref="pagearea=body&targetsite=external&targetcat=link&targettype=uri">Email Us</a>.</p></div></div></div></div>
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<div xmlns:np="http://ncbi.gov/portal/XSLT/namespace" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"></div><div class="portlet"><div class="portlet_head"><div class="portlet_title"><h3><span>Views</span></h3></div><a name="Shutter" sid="1" href="#" class="portlet_shutter" title="Show/hide content" remembercollapsed="true" pgsec_name="PDF_download" id="Shutter"></a></div><div class="portlet_content"><ul xmlns:np="http://ncbi.gov/portal/XSLT/namespace" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" class="simple-list"><li><a href="/books/NBK66059.13/?report=reader">PubReader</a></li><li><a href="/books/NBK66059.13/?report=printable">Print View</a></li><li><a data-jig="ncbidialog" href="#_ncbi_dlg_citbx_NBK66059" data-jigconfig="width:400,modal:true">Cite this Page</a><div id="_ncbi_dlg_citbx_NBK66059" style="display:none" title="Cite this Page"><div class="bk_tt">PDQ Screening and Prevention Editorial Board. Skin Cancer Prevention (PDQ®): Health Professional Version. 2023 Dec 8. In: PDQ Cancer Information Summaries [Internet]. Bethesda (MD): National Cancer Institute (US); 2002-. <span class="bk_cite_avail"></span></div></div></li></ul></div></div><div class="portlet"><div class="portlet_head"><div class="portlet_title"><h3><span>Version History</span></h3></div><a name="Shutter" sid="1" href="#" class="portlet_shutter shutter_closed" title="Show/hide content" remembercollapsed="true" pgsec_name="version_history" id="Shutter"></a></div><div class="portlet_content" style="display: none;"><ul xmlns:np="http://ncbi.gov/portal/XSLT/namespace" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" class="simple-list"><li><span class="bk_col_itm"><a href="/books/NBK66059.14/">NBK66059.14</a></span> March 7, 2024</li><li><span class="bk_col_itm">NBK66059.13</span> December 8, 2023 (Displayed Version)</li><li><span class="bk_col_itm"><a href="/books/NBK66059.12/">NBK66059.12</a></span> May 22, 2023</li><li><span class="bk_col_itm"><a href="/books/NBK66059.11/">NBK66059.11</a></span> December 23, 2022</li><li><span 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ref="log$=inpage&link_id=inpage">Interventions for Skin Cancer Prevention With Adequate Evidence of Benefit</a></li><li><a href="#CDR0000062764__174" ref="log$=inpage&link_id=inpage">Interventions for Skin Cancer Prevention With Inadequate Evidence of Benefit</a></li><li><a href="#CDR0000062764__30" ref="log$=inpage&link_id=inpage">Latest Updates to This Summary (12/08/2023)</a></li><li><a href="#CDR0000062764__AboutThis_1" ref="log$=inpage&link_id=inpage">About This PDQ Summary</a></li></ul></div></div><div class="portlet"><div class="portlet_head"><div class="portlet_title"><h3><span>Related publications</span></h3></div><a name="Shutter" sid="1" href="#" class="portlet_shutter" title="Show/hide content" remembercollapsed="true" pgsec_name="document-links" id="Shutter"></a></div><div class="portlet_content"><ul xmlns:np="http://ncbi.gov/portal/XSLT/namespace" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" class="simple-list"><li><a href="/books/NBK65998/">Patient 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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" class="author">PDQ Screening and Prevention Editorial Board. </em><em xmlns:np="http://ncbi.gov/portal/XSLT/namespace" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" class="cit">PDQ Cancer Information Summaries. 2002</em></div></div></li><li class="brieflinkpopper two_line"><a class="brieflinkpopperctrl" href="/pubmed/26389451" ref="ordinalpos=1&linkpos=2&log$=relatedreviews&logdbfrom=pubmed"><span xmlns:np="http://ncbi.gov/portal/XSLT/namespace" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" class="invert">Review</span> Cancer Prevention Overview (PDQ®): Health Professional Version.</a><span class="source">[PDQ Cancer Information Summari...]</span><div class="brieflinkpop offscreen_noflow"><span xmlns:np="http://ncbi.gov/portal/XSLT/namespace" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" class="invert">Review</span> Cancer Prevention Overview (PDQ®): Health Professional Version.<div 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Cancer Prevention (PDQ®): Health Professional Version.<div class="brieflinkpopdesc"><em xmlns:np="http://ncbi.gov/portal/XSLT/namespace" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" class="author">PDQ Screening and Prevention Editorial Board. </em><em xmlns:np="http://ncbi.gov/portal/XSLT/namespace" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" class="cit">PDQ Cancer Information Summaries. 2002</em></div></div></li><li class="brieflinkpopper two_line"><a class="brieflinkpopperctrl" href="/pubmed/26389433" ref="ordinalpos=1&linkpos=4&log$=relatedreviews&logdbfrom=pubmed"><span xmlns:np="http://ncbi.gov/portal/XSLT/namespace" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" class="invert">Review</span> Cervical Cancer Prevention (PDQ®): Health Professional Version.</a><span class="source">[PDQ Cancer Information Summari...]</span><div class="brieflinkpop offscreen_noflow"><span xmlns:np="http://ncbi.gov/portal/XSLT/namespace" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" class="invert">Review</span> Cervical Cancer Prevention (PDQ®): Health Professional Version.<div class="brieflinkpopdesc"><em xmlns:np="http://ncbi.gov/portal/XSLT/namespace" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" class="author">PDQ Screening and Prevention Editorial Board. </em><em xmlns:np="http://ncbi.gov/portal/XSLT/namespace" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" class="cit">PDQ Cancer Information Summaries. 2002</em></div></div></li><li class="brieflinkpopper two_line"><a class="brieflinkpopperctrl" href="/pubmed/26389366" ref="ordinalpos=1&linkpos=5&log$=relatedreviews&logdbfrom=pubmed"><span xmlns:np="http://ncbi.gov/portal/XSLT/namespace" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" class="invert">Review</span> Skin Cancer Treatment (PDQ®): Health Professional Version.</a><span class="source">[PDQ Cancer Information Summari...]</span><div class="brieflinkpop offscreen_noflow"><span 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<title>Facebook</title>
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<g>
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<path class="st10" d="M159,99.1h-24V88.4c0-5,3.3-6.2,5.7-6.2h16.8V60l-24.4-0.1c-22.1,0-26.2,16.5-26.2,27.1v12.1H90v22.5h16.9 v67.5H135v-67.5h21.7L159,99.1z"></path>
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</a></li>
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<li class="list-inline-item"><a href="https://www.youtube.com/user/NLMNIH" aria-label="Youtube" target="_blank" rel="noopener noreferrer"><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" x="0px" y="0px" viewBox="0 0 249 249" style="enable-background:new 0 0 249 249;" xml:space="preserve">
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<title>Youtube</title>
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<style type="text/css">
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.st4 {
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fill: none;
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<path class="st5" d="M88.4,1037.4c-10.4,0-18.7,8.3-18.7,18.7v40.1c0,10.4,8.3,18.7,18.7,18.7h72.1c10.4,0,18.7-8.3,18.7-18.7 v-40.1c0-10.4-8.3-18.7-18.7-18.7H88.4z M115.2,1058.8l29.4,17.4l-29.4,17.4V1058.8z"></path>
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</svg></a></li>
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<div class="col-lg-3 col-12">
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<p class="address_footer text-white">National Library of Medicine<br />
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<a href="https://www.google.com/maps/place/8600+Rockville+Pike,+Bethesda,+MD+20894/@38.9959508,-77.101021,17z/data=!3m1!4b1!4m5!3m4!1s0x89b7c95e25765ddb:0x19156f88b27635b8!8m2!3d38.9959508!4d-77.0988323" class="text-white" target="_blank" rel="noopener noreferrer">8600 Rockville Pike<br />
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Bethesda, MD 20894</a></p>
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<div class="col-lg-3 col-12 centered-lg">
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<p><a href="https://www.nlm.nih.gov/web_policies.html" class="text-white">Web Policies</a><br />
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<a href="https://www.nih.gov/institutes-nih/nih-office-director/office-communications-public-liaison/freedom-information-act-office" class="text-white">FOIA</a><br />
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<a href="https://www.hhs.gov/vulnerability-disclosure-policy/index.html" class="text-white" id="vdp">HHS Vulnerability Disclosure</a></p>
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</div>
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<div class="col-lg-3 col-12 centered-lg">
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<p><a class="supportLink text-white" href="https://support.nlm.nih.gov/">Help</a><br />
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<a href="https://www.nlm.nih.gov/accessibility.html" class="text-white">Accessibility</a><br />
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<a href="https://www.nlm.nih.gov/careers/careers.html" class="text-white">Careers</a></p>
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<div class="row">
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<nav class="bottom-links">
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<ul class="mt-3">
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<li>
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<a class="text-white" href="//www.nlm.nih.gov/">NLM</a>
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</li>
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<li>
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<a class="text-white" href="https://www.nih.gov/">NIH</a>
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</li>
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<li>
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<a class="text-white" href="https://www.hhs.gov/">HHS</a>
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<li>
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<a class="text-white" href="https://www.usa.gov/">USA.gov</a>
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<script type="text/javascript" src="/portal/portal3rc.fcgi/static/js/hfjs2.js"> </script>
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