Video: Doctors urge caution over prostate drug

  1. Closed captioning of: Doctors urge caution over prostate drug

    >> tonight. thanks.

    >>> two-big-name medications are in the news tonight in two separate health stories about possible new uses for both. you've seen both of them advertised on this broadcast and others. we have more now on both developments beginning with a big study testing a drug for reducing the risk of prostate cancer . our report from our chief science correspondent robert bazell .

    >> reporter: rob is one of more than 8,000 volunteers in the study of avodart. while widely prescribed to shrink the noncancer enlargement of the prostate called bph, it reduces the risk of prostate cancer by almost 24% in a four-year period.

    >> hopefully this will help a lot of people.

    >> reporter: glaxosmithkline, which makes avodart is asking the fda to allow sales of the drug for a new use, to reduce cancer risk. the head of the study paid for by the company agrees.

    >> i think risk reduction is a better term than prevention for what we did. it reduces a man's chance of being diagnosed with prostate cancer .

    >> reporter: there are headlines today on an even more popular class of drugs, cholesterol-reducing statins. the fda is allows astrazeneca to marketist blockbuster drug crestor, to millions of people who have normal levels of cholesterol. under the new rules, the drug can be sold to people with high levels of c-reactor protein, which studies show can increase risk of heart disease .

    >> 1/4 million heart attacks , strokes, bypass surgeries and deaths could be avoided if the strategy that was tested here was used over a five-year period.

    >> reporter: some doctors are urging caution with the expanded use of both drugs. like all medications, they have side effects which may outweigh the benefits for healthy people. these new fda rules could bring millions of new profits for both companies, but there is a generic option for both.

    >> one is generic and available for less money and an individual decides he wants to be on the drug, might as well go for that and save the money.

    >> reporter: generics can cost as little as 1/10 as much as brand medications. robert bazell , new york.

    >>> we turn now to the

By AP Medical Writer
updated 3/31/2010 6:07:59 PM ET 2010-03-31T22:07:59

Full results of a big study testing a drug for preventing prostate cancer show a higher risk of heart failure, a surprise finding that could dampen enthusiasm for expanding its use.

On Monday, GlaxoSmithKline PLC asked the federal Food and Drug Administration to approve its drug Avodart as a cancer preventive for men at higher-than-normal risk of the disease. The drug is already sold for urinary problems, and no heart failure risks have been seen with that use, doctors say.

Results of a study testing it as a cancer preventive were given at a medical conference last year, but the heart risk information had not been analyzed at that time so only the main results of the study were presented, a Glaxo spokeswoman said. Full results are being published in Thursday's New England Journal of Medicine.

The study involved 6,700 men with high scores from PSA blood tests but no sign of cancer on biopsy. They were given Avodart or dummy pills and new biopsies four years later. Prostate cancer was found in 25 percent of those on dummy pills and 20 percent of those on Avodart.

That's the same risk reduction as other studies have found from a similar drug, finasteride, sold in generic form and as Proscar, made by Merck & Co. Inc. Studies did not find an increased risk of heart failure with Proscar. In the Avodart study, heart failure developed in 30 men on the drug versus only 16 on dummy pills.

Further analysis suggests that men who developed heart failure while on Avodart also tended to be taking certain other drugs, said Glaxo spokeswoman Sarah Alspach. The higher heart failure rate in this study "is unexpected and inconsistent" with previous research, she said.

Last year, a panel of health experts recommended that men consider Proscar or Avodart if they are regularly getting screened for prostate cancer. But the Avodart study was not available when the advice was developed.

The two drugs work in different ways and may not have the same safety profile, said Dr. Barnett Kramer, a National Institutes of Health scientist who led the expert panel and had no role in the study.

In the full Avodart results, "the important detail is there's a heart failure signal here that was unanticipated," Kramer said.

Dr. Otis Brawley, who helped run the study before becoming the American Cancer Society's chief medical officer in 2007, said the heart failure risk may be a fluke, but men would need to be watched for it. If it develops, "it's reason to stop the drug," he said.

How many men would opt to take either drug for prostate cancer prevention is unclear. The cost is about $3 a pill. To prevent a single additional case of cancer, 71 men would have to take Proscar for seven years, doctors have calculated.

Prostate cancer is the most common non-skin cancer in American men. About 192,000 new cases and 27,000 deaths from it occurred last year.

Copyright 2010 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.


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