Patients and Doctors Testify About Safety and Effectiveness of Avastin for Advanced Breast Cancer
By Brenda GoodmanWebMD Health News
June 28, 2011 ? An unusual and closely watched hearing on the fate of Avastin as a treatment for advanced breast cancer got off to an emotional start on Tuesday, with federal advisors listening to testimony from patients, doctors, and advocacy groups.
Many urged the FDA to reconsider its decision to withdraw approval for Avastin as a treatment for advanced breast cancer.
?I owe my life to Avastin,? said Patricia Howard, age 66, of New York, who has been treated for breast cancer since 2005. ?I?m not just a piece of anecdotal evidence. I?m a wife, mother, sister, aunt, friend, and grammy.?
But others applauded the agency?s decision.
Christine Brunswick, vice president of the National Breast Cancer Coalition, said she has also been diagnosed with metastatic breast cancer. ?I can personally attest to how devastating this disease is.?
She said scientific studies have not proven that the drug is safe or effective as a breast cancer treatment.
?We must accept and act on evidence or we will never make the needed progress we so desperately want,? she says. ?We now know that women died because of this drug.?
Controversy Over Avastin
Avastin is a drug that shrinks tumors by choking off their blood supply.
It was first approved in 2004 to treat metastatic colon cancer and certain non-small-cell lung cancers. Since then, it has also been approved to treat metastatic renal cell carcinoma and glioblastoma brain tumors.
In 2008, against the recommendation of its advisors, the FDA approved Avastin for breast cancer through an accelerated approval process that allows a therapy to be marketed to the public based on preliminary clinical findings, pending further studies to confirm its safety and effectiveness.
That approval was based on the results of a single clinical trial which found that Avastin prevented breast cancer from progressing for an average of 5.5 months longer in women who took Avastin combined with the chemotherapy drug paclitaxel, compared to women taking paclitaxel and a placebo.
No other studies have been able to repeat that result, however.
And four subsequent studies have failed to find that Avastin keeps breast cancer from progressing or that it improves overall survival compared to standard chemotherapy.
Those studies have also shown that patients taking Avastin have higher rates of serious adverse events. One study found that half of women taking Avastin experienced episodes of bleeding, a rate that was twice as high as women on a standard chemotherapy drug.
Other common and sometimes serious side effects experienced by women on the drug include high blood pressure, heart attacks, heart failure, protein in the urine (a sign of kidney damage), and gastrointestinal perforations ? holes in the lining of the stomach or intestines.
Accelerated Approval Program
In December 2010, the FDA announced that it would withdraw its conditional approval as a treatment for breast cancer.
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