A new study finds that many women with early breast cancer do not need a painful procedure that has long been routine: removal of cancerous lymph nodes from the armpit.
The discovery turns standard medical practice on its head. Surgeons have been removing lymph nodes from under the arms of breast cancer patients for 100 years, believing it would prolong women’s lives by keeping the cancer from spreading or coming back.
Now, researchers report that for women who meet certain criteria — about 20 percent of patients, or 40,000 women a year in the United States — taking out cancerous nodes has no advantage. It does not change the treatment plan, improve survival or make the cancer less likely to recur. And it can cause complications like infection and lymphedema, a chronic swelling in the arm that ranges from mild to disabling.
Removing the cancerous lymph nodes proved unnecessary because the women in the study had chemotherapy and radiation, which probably wiped out any disease in the nodes, the researchers said.
Those treatments are now standard for women with breast cancer in the lymph nodes, based on the realization that once the disease reaches the nodes, it has the potential to spread to vital organs and cannot be eliminated by surgery alone.
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