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Big promise is seen in 2 new breast cancer drugs
SAN ANTONIO (AP) - Breast cancer experts are cheering what could be some of the biggest advances in more than a decade: two new medicines that significantly delay the time until women with very advanced cases get worse.
In a large international study, an experimental drug from Genentech called pertuzumab held cancer at bay for a median of 18 months when given with standard treatment, versus 12 months for others given only the usual treatment. It also strongly appears to be improving survival, and follow-up is continuing to see if it does.
“You don’t see that very often. … It’s a spectacular result,” said one study leader, Dr. Sandra Swain, medical director of Washington Hospital Center’s cancer institute.
In a second study, another drug long used in organ transplants but not tried against breast cancer _ everolimus, sold as Afinitor by Novartis AG _ kept cancer in check for a median of 7 months in women whose disease was worsening despite treatment with hormone-blocking drugs. A comparison group that received only hormonal medicine had just a 3-month delay in disease progression.
Afinitor works in a novel way, seems “unusually effective” and sets a new standard of care, said Dr. Peter Ravdin, breast cancer chief at the UT Health Science Center in San Antonio. He has no role in the work or ties to drugmakers. Most patients have tumors like those in this study _ their growth is fueled by estrogen.
Results were released Wednesday at the San Antonio Breast Cancer Symposium and some were published online by the New England Journal of Medicine. They come a few weeks after federal approval was revoked for another Genentech drug, Avastin, that did not meaningfully help breast cancer patients. It still is sold for other tumor types.
The new drugs are some of the first major developments since Herceptin came out in 1998. It has become standard treatment for a certain type of breast cancer.
“These are powerful advances … an important step forward,” said Dr. Harold Burstein, a breast expert at Dana-Farber Cancer Institute in Boston who had no role in the studies.
A reality check: The new drugs are likely to be very expensive _ up to $10,000 a month _ and so far have not proved to be cures. Doctors hope they might be when given to women with early-stage cancers when cure is possible, rather than the very advanced cases treated in these studies.
Even short of a cure, about 40,000 U.S. women each year have cancer that spreads beyond the breast, and treatment can make a big difference in their lives.
Rachel Midgett is an example. The 39-year-old Houston woman has breast cancer that spread to multiple parts of her liver, yet she ran a half-marathon in Las Vegas on Sunday. She has had three scans since starting on Afinitor nine months ago, and “every time, my liver lesions keep shrinking,” she said.
“My quality of life has been wonderful. It’s amazing. I have my hair. … If you saw me you wouldn’t even know I have cancer.”
Genentech, part of the Switzerland-based Roche Group, applied Tuesday to the federal Food and Drug Administration for permission to sell pertuzumab (per-TOO-zoo-mab) as initial treatment for women like those in the study.
The drug targets cells that make too much of a protein called HER2 _ about one of every four or five breast cancer cases. Herceptin attacks the same target but in a different way, and the two medicines complement each other.
The study tested the combination in 808 women from Europe, North and South America and Asia and found a 6-month advantage in how long the cancer stayed stable. All women also received a chemotherapy drug, docetaxel.
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