my usual go-to here is to observe that cancer is 100% all-natural.

I have been tempted to put it on a T-shirt to be worn at gatherings where I might find myself in the company of people who celebrate or promote "natural" as if it were an axiomatic good.

In reality I could never bring myself to wear it in public out of concern for by-catch side effects: griefing random strangers for whom the miseries of cancer may form a very real part of their daily experience is not something I'd want to be associated with even if it was not the intended result.