The concept of a breast cancer that has no symptoms, which can not be diagnosed through manual palpation of the breast and does not become invasive in the vast majority of cases, might sound unbelievable to most women. However, there does exist a rather mysterious clinical anomaly known as Ductal Carcinoma In Situ (DCIS), which is, in fact, one of the most commonly diagnosed and unnecessarily treated forms of "breast cancer" today.
Millions of asymptomatic women undergo breast screening annually because their doctors tell them to do so. Not only are these women's presumably healthy breasts being exposed to highly carcinogenic x-rays, but thousands have received a diagnosis of 'breast cancer' for entirely benign lesions that when left untreated would have caused no harm to them whatsoever.
A quarter century old practice: X-ray based breast screening, has now been confirmed (twice in 3 years) to cause more harm than good, and by what is perhaps the most respected research institution within "evidence-based medicine": The Cochrane Collaboration.