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Anemia Drugs May Speed Tumor Growth in Some Cancer Patients
Date:6/1/2008

Widely prescribed blood-boosters might stimulate malignant cells, hasten death, study says

SUNDAY, June 1 (HealthDay News) -- Drugs used widely to treat anemia in cancer patients may actually speed progression of the cancer in certain individuals, but researchers report they may found a way to determine who those individuals are.

"We may have a test to predict whether a patient is susceptible to having their tumor progress if treated with erythropoietin and, alternatively, we may be able to predict patients it would be safe to treat with erythropoietin," study author Dr. Tony Blau, of the University of Washington in Seattle, said during a Sunday news conference at the American Society of Clinical Oncology annual meeting in Chicago.

Recent controversy over erythropoiesis-stimulating agents (ESAs) such as Procrit, Epogen and Aranesp has centered around whether the blood-boosting drugs should be withdrawn from the market because of troubling side effects.

In March, a U.S. Food and Drug Administration advisory panel voted to recommend continued use of the drugs for patients on chemotherapy, unless the patient is likely to be cured. They also voted to recommend against the drugs' use in patients with breast or head and neck cancer.

Eight clinical trials now suggest these medications actually speed the growth of tumors and shorten the lives of cancer victims.

The drugs' manufacturers added a "black box" warning to the medications last November.

"There has been lots of controversy over these stimulating agents, and we have an FDA advisory committee to act on this as we speak," said Dr. Julie Gralow, director of breast oncology at the University of Washington and Fred Hutchinson Cancer Center in Seattle and moderator of the Sunday news conference. "The drugs offer benefits in terms of reducing anemia and reducing transfusions, but several large trials in a variety of tumor types suggest that
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