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Largest-Yet Mesothelioma Study Shows Survival Bene

By: Govt

Researchers with the largest phase III trial to date for mesothelioma, an aggressive cancer affecting the lining of the lung, reported results showing that patients on a new chemotherapy drug regimen live longer and have less pain than those on an older drug. The findings were announced at the annual meeting of the American Society of Clinical Oncology meeting in Orlando, Fla., on May 20, 2002.

Pemetrexed (brand name Alimtaô) is a novel antifolate, a class of drugs that targets the folic acid metabolic pathway, which effects availability of certain B complex vitamins. The results of the trial show that tumors shrank in 41 percent of patients on pemetrexed in combination with a more commonly used chemotherapy agent called cisplatin. Only 17 percent of patients receiving cisplatin alone experienced tumor shrinkage. Additionally, those on the pemetrexed combination lived nearly three months longer than those on cisplatin alone.

According to lead author, Nicholas J. Vogelzang, M.D., University of Chicago Cancer Research Center, "This is the largest clinical trial ever conducted in this disease and the 25 to 30 percent improvement in survival for patients on the combination therapy is the first time anyone has documented a significant improvement in patients treated for mesothelioma."

Malignant pleural mesothelioma is associated with a history of asbestos exposure in about 70 to 80 percent of all cases and there is no approved or very effective chemotherapy for the disease. Researchers hypothesized that pemetrexed might prove effective in treating this disease because it targets key enzymes (molecules that speed up chemical reactions in the body) thought to play a role in allowing the rapid growth of this tumor.

Early phase I trial results in 11 patients tested with pemetrexed and cisplatin were promising and a definitive randomized phase III trial was developed. Since there are no established therapies for this condition, a standard chemotherapy agent called cisplatin that has shown efficacy in treating other diseases, was used as the control group. The phase III stud....[MORE]