I've told some relatives and a few friends (on a need-to-know basis) about my diagnosis and treatment. When they've later asked "How are you doing?", I tell them the truth (which isn't horrible because I've been handling the expected ADT side effects pretty well). Once I've told that truth, I get one of two reactions: 1) They don't ask again. Maybe they're mildly freaked out for a moment, but anyway, we go back to normal, and it never comes up again. Or 2) They do ask again, and I give them a short update. In the second case, I think it reflects actual interest or concern, so I respect those people by taking their question at face value. No drama or discomfort either way.