My best friend got breast cancer a few years ago. This is a really, really strong woman, who doesn’t take crap from anyone. She took her time and literally interviewed a bunch of oncologists before picking one.
She made up a list of questions, made appointments, went in with the list and if she wasn’t satisfied with the answers (she read underlying medical research even though she’s not in medicine, just damned smart), she stood up and said, nope, not you, I don’t like your answers/attitude/approach. Went through a bunch, IIRC, but found herself an excellent oncologist, doing fabulous (in spite of having the “no, you can’t relax after 5 years” kind of cancer).
Of course, this is a luxury that you can only afford if you are in an area where you have a choice in oncologists, but you certainly do NOT have to take on the first one you talk to.