I’ve seen some studies done on the onset of cancer and mentality, anxieties and so on. There are avenues opening up, but it’s early days yet.
In the USA in the past cancer was covered up and viewed as a family shame. You did not want others to know. In Japan this has existed until more recently and I think is still there to an extent.
Cancer used to be much rarer in America. That is was unusual 70-80 years ago was part of the reason families would cover it up. Plus is was a spooky hard to understand ailment. It was viewed as being a reflection of your bad character etc etc. I am simply stating how it used to be.