Both my parents had cancer. Lung cancer for my father (he was a smoker for most of his adult life). He had a couple of surgeries and radiation and chemo and it bought him probably 10 years at the expense of a few intervals of discomfort. I think that's probably worth it, but it's hard to know ahead of time how things will turn out. The cancer eventually returned, and given his age and overall health at the time there was nothing more to be done.
Mother had breast cancer, caught early, and fully cured with lumpectomy and some radiation (no recurrence before her death due to unrelated causes).
Other forms of cancer are less treatable. It all depends on type and how early it's detected. I don't see much point in making any kind of hard-and-fast decisions ahead of time. When the time comes, look at the facts, get some good medical advice, and then decide what you want to do.
Mother had breast cancer, caught early, and fully cured with lumpectomy and some radiation (no recurrence before her death due to unrelated causes).
Other forms of cancer are less treatable. It all depends on type and how early it's detected. I don't see much point in making any kind of hard-and-fast decisions ahead of time. When the time comes, look at the facts, get some good medical advice, and then decide what you want to do.