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<span>NIH study finds Avastin and Lucentis are equally effective in treating age-related macular degeneration</span>
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<a href="/about/news-and-events/news?topic=246" hreflang="en">Age-Related Macular Degeneration</a>
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<a href="/about/news-and-events/news?topic=42" hreflang="en">Macular Edema</a>
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<p>Researchers are reporting results from the first year of a two-year clinical trial that Avastin, a drug approved to treat some cancers and that is commonly used off-label to treat age-related macular degeneration (AMD), is as effective as the Food and Drug Administration-approved drug Lucentis for the treatment of AMD.</p><p>The report, from the Comparison of AMD Treatments Trials (CATT), was published online today in the New England Journal of Medicine. CATT is funded by the National Eye Institute (NEI), a part of the National Institutes of Health.</p><p>“Over 250,000 patients are treated each year for AMD, and a substantial number of them receive Avastin. Given the lack of efficacy data regarding Avastin for AMD treatment, the NEI had an obligation to patients and clinicians to conduct this study,” said Paul A. Sieving, M.D., Ph.D., director of the NEI.</p><p>AMD is the leading cause of vision loss and blindness in older Americans. In its advanced stages, the wet form of AMD spurs the growth of abnormal blood vessels, which leak fluid and blood into the macula and obscure vision. The macula is the central portion of the retina that allows us to look straight ahead and to perceive fine visual detail. Accumulation of fluid and blood damages the macula, causing loss of central vision. AMD can severely impede mobility and independence. Many patients are unable to drive, read, recognize faces or perform tasks that require hand-eye coordination.</p><p>Genentech, the maker of both drugs, originally developed Avastin to prevent blood vessel growth that enables cancerous tumors to develop and spread. In 2004, the FDA approved Avastin for the systemic treatment of metastatic colon cancer. Genentech later developed Lucentis, derived from a protein similar to Avastin, specifically for injection in the eye to block blood vessel growth in AMD.</p><p>In 2005, two Genentech-sponsored clinical trials established Lucentis as highly effective for the treatment of wet AMD. During the year between the announcement of the trial results and the release of Lucentis, ophthalmologists began injecting AMD patients with low doses of Avastin, due to its similarity to Lucentis and its availability. The FDA has not licensed Avastin for the treatment of AMD.</p><p>Numerous physicians noted a beneficial treatment effect and Avastin’s use grew rapidly despite the lack of data on safety, efficacy and dosing from randomized clinical trials to support its use. Ophthalmologists used Avastin primarily as needed, or pro re nata (PRN), when there was evidence of active disease. The FDA approved Lucentis in 2006. However, most clinicians adopted PRN dosing for Lucentis, which was a departure from FDA-approved labeling and the monthly dosing schedule evaluated in the Genentech-sponsored clinical trials. It was not known if PRN dosing would produce the same long term vision benefits that were achieved with monthly administration.</p><p>NEI launched CATT in 2008 to compare Lucentis and Avastin for treatment of wet AMD. The study has now reported results for 1,185 patients treated at 43 clinical centers in the United States. Patients were randomly assigned and treated with one of four regimens for a year. They received Lucentis monthly or PRN, or Avastin monthly or PRN. Enrollment criteria required that study participants had active disease.</p><p>Patients in the monthly dosing groups received an initial treatment and then had an injection every 28 days. Patients in the PRN groups received an initial treatment and were then examined every 28 days to determine medical need for additional treatment. PRN groups received subsequent treatment when there were signs of disease activity, such as fluid in the retina. Ophthalmologists involved in patient care did not know which study drug a patient was getting, to make sure that the data was not affected by how anyone felt about the treatment.</p><p>Change in visual acuity served as the primary outcome measure for CATT. Thus far, visual acuity improvement was virtually identical (within one letter difference on an eye chart) for either drug when given monthly. In addition, no difference was found in the percentage of patients who had an important gain or loss in visual function. Also, when each drug was given on a PRN schedule, there also was no difference (within one letter) between drugs. PRN dosing required four to five fewer injections per year than monthly treatment. Visual gains were about two letters less with PRN than with monthly treatment but overall visual results were still excellent.</p><p>“In addition to the primary finding of equivalence between Lucentis and Avastin for visual acuity, CATT also demonstrates that PRN dosing is a viable treatment option for either of these drugs,” said Daniel F. Martin M.D., study chair for CATT and chairman of the Cole Eye Institute at the Cleveland Clinic. “Substantial visual acuity gains may be accomplished with a lower treatment burden.”</p><p>Adverse events indicate development or worsening of a medical condition. They may or may not be causally associated with the clinical trial treatment, but they are always monitored and reported in any clinical trial. The median age of patients in CATT was over 80 years, and a high rate of hospitalizations might be anticipated as a result of chronic or acute medical conditions more common to older populations.</p><p>Serious adverse events (primarily hospitalizations) occurred at a 24 percent rate for patients receiving Avastin and a 19 percent rate for patients receiving Lucentis. These events were distributed across many different conditions, most of which were not associated with Avastin in cancer clinical trials where the drug was administered at 500 times the dose used for AMD. The number of deaths, heart attacks, and strokes were low and similar for both drugs during the study. CATT was not capable of determining whether there is an association between a particular adverse event and treatment. Differences in serious adverse event rates require further study.</p><p>Investigators in the CATT study will continue to follow patients through a second year of treatment. These additional data will provide information on longer-term effects of the drugs on vision and safety.</p><p>The FDA has not evaluated data from the CATT trial.</p><p>References:</p><p>Find more information about this clinical trial (NCT00593450) at <a href="http://www.clinicaltrials.gov/">www.clinicaltrials.gov</a></p>
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