Oh no, the researchers fully believe in what they are doing. The huge corporations who own it all do not. All they care about is money. Would they bury something like this if they could? Absolutely, and it has probably been done many times already.
Most of the researchers I know are funded by government grants, not corporations. Most researchers in other countries are not funded by corporations. And why would those corporations who do spend millions on cancer research do so if they “only care about money”? You think it’s just some enormously expensive PR stunt? You don’t think any corporation who finds a cure for cancer would make more money than they could count?