New Study: Many Breast Tumors Will Spontaneously Regress

A groundbreaking study published this month in The Lancet Oncology shows for the first time that many screen-detected invasive breast tumors spontaneously regress when under-diagnosed and untreated. 

The study investigated the natural history of breast cancers detected in the Swedish mammography screening program between 1986 to 1990, involving 650,000 women.  

Due to the fact that breast lesions and tumors like DCIS, and even so-called “invasive” breast cancers, are aggressively removed and/or treated before they can be determined with any certainty to be a clear and present threat to health, there has been little to no research on what happens when they are left alone, i.e. their natural history.

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