It turns out that intense mechanical pressure experienced by early cancer cells as they grow cramped in a restricted space can benefit some cancer cells, rather than impede growth, as might be expected.
Scientists found that early breast cancer cells used this ‘squeeze’ to their advantage.

For those who are panicing, it refers to how the cells are constricted into enclosed spaces as they grow, not squeezing from the outside of the breast.
Whew, almost had to hide this from my wife.
Same. I rather enjoy giving my wife weekly ‘screenings’ for lumps. Didn’t enjoy the thought of that changing lol.