Has anyone here undergone treatment for prostate cancer?

My father-in-law was diagnosed with prostate cancer or benign prostatic hyperplasia about ten years ago. Recently, during a health check-up, his test results came back high, and he was advised to undergo detailed examinations at a major hospital. However, he remembers how difficult it was during the last test ten years ago because he couldn't wake up from anesthesia, so this time he has decided not to get tested and just stay as he is.

Since there are no symptoms, they are refusing more firmly, and I am 고민ing whether to just watch and wait or to forcibly take them.

Is prostate cancer a very dangerous cancer?