I bring it up when my experience might be useful to someone I am speaking with. When I had breast cancer, I told everybody. When I had gyn cancer, I told nobody -- not because of where it was, but because a lot of people I know casually approach me like....uh, uh, are you okay now?? because of the breast cancer from 2019. It's an identity I can't shed, no matter what I do. So I decided early on not to tell the next time around.