There are some things you should not do .
This is one if true.
Fella who used to be a cop in my Force once set out on an elaborate hoax, convincing those around him, including his (now ex) wife that he had cancer. So convincing was his story that he even convinced her to start a family early, whilst they still had the opportunity. He took time off work for “treatment”. Long after the lies became evident, nobody could ever establish what he was actually trying to achieve by doing it, because there was never any tangible gain.
As someone who lost my father to cancer, and has had treatment for it myself, I would never wish the disease on anyone. I came perilously close to changing that stance when I heard the full story about this man.