Is it prossible to transmit cancer to another person by contact? Case in point: An acquaintance of mine had kidney cancer and prostate cancer each of which have been successfuly cured. Later his wife had uterine cancer. Could her malady have been transmitted by the kidney/prostate cancers?

So I am 20 years old and I began to become more worried about breast cancer.
There is no history of breast cancer in my family but I just thought it would be good to do some early testing just in case.
So I was wondering, what kind of tests should be done to detect breast cancer at age 20? I heard that mannograms should be done around 35. Is there any other examinations that you can do at an early age? And if there is where can I get them done? Regular family physician, gynocologist? Thanks everyone!

I’m doing a bio paper on breast cancer and i know the symptoms that they check for to diagnos u with breast cancer but i don’t know how cancer really affects the body. Like what would it do if left untreated.