A new study out of the University of California at Berkeley suggests that squeezing, or as the scientists say, ‘mechanical inputs’ and/or ‘compression’, could halt or even revert the development of cancerous tissues and cells in breasts.
Via the Daily Caller: 

It’s no longer National Breast Cancer Awareness Month, but why let the calendar get in the way? According to scientists at the University of California Berkeley, that earnest squeeze that comes naturally to most guys could be a life-saver for a woman with the beginnings of malignant breast cancer. 

“We are showing that tissue organization is sensitive to mechanical inputs from the environment at the beginning stages of growth and development,” Berkeley bioengineering professor Daniel Fletcher told the annual meeting of the American Society for Cell Biology in San Francisco on Monday. 

“An early signal, in the form of compression, appears to get these malignant cells back on the right track.”

Silicone molds injected with breast cancer cells were used to show that mechanical manipulation could ‘nurture’ the tissue back to a healthier state, and “can revert and stop the out-of-control growth of cancer cells”.
One researcher warns that compression would not constitute a prescribed therapy for breast cancer.
But it can’t hurt to try.  Second base saves lives.