Widespread use of screening mammograms has dramatically increased diagnoses of a breast abnormality known as ductal carcinoma in situ, prompting debate over how aggressively to treat the condition, Long Island Newsday reports. DCIS -- a "stage zero cancer" -- is confined to the milk duct and might never progress to invasive breast cancer. However, because doctors have no way of knowing which cases will progress and which ones will never pose a threat, all patients are offered surgery and radiation, according to Newsday...
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