But the new study suggests 4.5 percent of breast cancer surgery in 2003 involved women getting cancerous and healthy breasts simultaneously removed, a 150 percent increase from 1998 — with no sign that the trend was slowing.

Young women are most likely to choose the aggressive operation, researchers report Monday in the Journal of Clinical Oncology.

The concern is whether they're choosing in the heat of the moment — breast cancer surgery often is within two weeks of diagnosis — or with good understanding of its pros and cons.

"Are these realistic decisions or not?" asks Dr. Todd Tuttle, cancer surgery chief at the University of Minnesota, who led the study after more women sought the option in his own hospital.

"I'm afraid that women believe having their opposite breast removed is somehow going to improve their breast cancer survival. In fact, it probably will not affect their survival," he said.

The initial tumor already may have sent out seeds of spread to key organs, Tuttle explained.

But removing the remaining healthy breast does greatly lower, although not eliminate, chances of a new cancer developing on the opposite side.

Don't underestimate the peace of mind that brings, said Trisha Stotler Meyer of Vienna, Va., who had her breasts removed three weeks ago.

"Doctors are not up at night crying" in fear of their next mammogram, said Meyer, 37, who went back for a double mastectomy after her initial cancer surgery. "I don't want to have to deal with the stress."

Meyer is far from alone.

In a single day last week, Dr. Shawna Willey of Georgetown University's Lombardi Cancer Center had two patients seek the operation.

One needed her entire cancerous breast removed, and immediately asked to have the healthy one removed, too. Another woman had recently undergone a lumpectomy and was sick from chemotherapy — and returned to ask that both breasts be fully removed.

"Her perception is, 'If I have my breasts taken off, I never have to do this again,'" said Willey, who asked the woman to see a counselor and finish chemo before deciding.

"I can understand that point of view," she added. "But I always tell them, it's not a guarantee."

The American Cancer Society estimates 178,480 U.S. women will be diagnosed with breast cancer this year. About 40,460 will die of it.

Some women at high risk, because of notorious breast cancer genes or family history, choose preventive mastectomies before cancer ever strikes.

Tuttle's study is the first national look at how many women choose to remove both a diseased and healthy breast together.

He used a government cancer registry that covers 16 regions, a representative sample of the U.S. population, to track more than 150,000 breast cancer surgeries between 1998 and 2003.

Tuttle calculated that lumpectomies accounted for almost 60 percent of those surgeries in 2003. Lumpectomies have gradually increased since they were proven just as effective as breast removal for early cancer in 1991.

The surprise: Single mastectomies remain the No. 2 option but are dropping — while double mastectomies, although uncommon, were on the rise for every stage of cancer. Even women who qualify for anti-hormone drugs that greatly protect the remaining breast were as likely to choose removal as women with harder-to-treat tumors.

Why? Tuttle is planning a new study to tell, and to see if candidates are warned about such risks as infection that increase with the bigger surgery.

Meyer, the Virginia woman, had time to fully consider the option. She was diagnosed with cancer in January 2005, shortly after her son's birth. At first, she was content with a lumpectomy, followed by chemotherapy and radiation. But she didn't qualify for protective anti-hormone drugs. And then in March, Meyer found a lump in her healthy breast. It wasn't cancer but a cyst that would wax and wane, making for tense checkups.

"It really freaked me out," Meyer said. "It was at that moment that my breasts became like tonsils. I don't need them anymore. They're gone."

Georgetown's Willey says better reconstructive surgery is partly spurring the trend. Still, she often encourages women to wait to remove the second breast, as lining up reconstruction sometimes dangerously delays treating the cancer.

"When I was younger ... I really tried to argue with patients and talk them out of it," Willey said. Now, if they've weighed the options, she doesn't.

"I can't recall a single patient who tells me they regret that decision."

Copyright AP

Notes:  One can only surmise that the reason for the increase in such butcherous mutilation procdures are done with the advice and consent of the patients oncologists - which I think is ghastly if not downright criminal.  Breast removal does NOT protect against cancer and in many instances may heed the spread of cancer.

Recently, my ex-wife's oncologist found lumps in her breast and advised an immediate mastectomy.  She said "wait a minute" and had more tests performed.  The tests found the lumps were not cancerous.  Her oncologist's reaction: he advised her to go ahead and have the mastectomy anyway as a "precautionary measure". He should have his license revoked and have to pay damages to anyone in similar circumstances who followed his advice and needlessly removed one or more of their breasts.