My wife has been dealing with two types of cancers, melanoma and uterine cancer. The melanoma was found back in January, when a mole on her back became red and nasty looking and was removed. She's never been a person who liked being out in the Sun a lot, so that's not the only way it can develop. The other cancer was found when they did the scans because of the melanoma. My one son has also gone through it too. His was found in his lymph nodes in his neck, when he felt lumps, and no where else. He was in the Navy, worked as an electrician on a nuclear submarine and thinks he was exposed too much of the radiation. He's had clear scans the last two times, so praying that he's over it.
My wife is currenting undergoing the chemo & immunotherapy treatments. She had the surgeries to remove the majority of it, and now the course of treatment is for removing what they can't detect with the current technology and might still be present. Then, we wait & see and continue praying.
Cancer is nasty stuff. I've had friends and family that have dealt with it and some of them passed away because of it. It's not something to be taken lightly, but fortunately the survival rates now are much better than they were at one time if they find it early enough. Hopefully, someday they'll figure it all out and find cures for it, or how it can be prevented entirely.