One of the most financially successful cancer drugs in the world appears to cause more fatal side effects than previously realized, a new study says. Avastin, a blockbuster drug with more than $5.5 billion in global sales, increases the rate of fatal side effects by almost 50% when added to traditional chemotherapy, compared with chemo alone. About 2.5% of cancer patients who combine Avastin and chemo die from their treatment - rather than their disease, according to an analysis of 10,217 patients in today's Journal of the American Medical Association. In comparison, 1.7% of cancer patients who received only conventional chemo died as a result of therapy. The most common causes of death were hemorrhages, the loss of infection-fighting white blood cells, and perforations in the stomach or intestines, says Shenhong Wu of Stony Brook University School of Medicine, co-author of the analysis of 10,217 patients.
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