Otto Warburg figured out a lot about cancer. Unfortunately he was a jew in Nazi Germany, and his insights were mostly forgotten when the “bad genes” theory of cancer took hold of the medical profession. There was a semi-recent NY Times article about the resurgence of Warburg’s metabolic theory of cancer.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4493566/#!po=5....

> but it's one of the few things we know that kind of works

Chemotherapy as a treatment for cancer is one of many pseudo-scientific medical practices commonly used by conventional medical practitioners.

Edit: link to NY Times article on Warburg: https://www.nytimes.com/2016/05/15/magazine/warburg-effect-a...

Works short term but wrecks your immune system long term, which means you will get sick from something else and no one can be blamed. Have you actually seen someone on chemo? Scientifically sound is not the first thing that comes into my mind. There's even a decent amount of objective research out there these days showing exactly this so there are really no excuses for clinging to these delusions any more.