WASHINGTON - The Food and Drug Administration warned patients Friday that using large amounts of a Johnson & Johnson foot ulcer medication could heighten their risk of dying from cancer.

The FDA added its most serious warning to the company's cream medication Regranex, which is prescribed to treat severe foot and leg ulcers in diabetics. The new boxed warning states that patients who used three or more tubes of Regranex over a 20-month period were five times more likely to die of cancer.

The U.S. Food and Drug Administration warned American consumers on Wednesday that it is looking into side effects of a class of arthritis drugs that could cause cancer in children.

The agency has taken to issuing alerts when it begins an investigation into reports of drug or medical-procedure problems, as it did last month with a smoking-cessation treatment that could lead to suicide.
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