I heard they found the cure for cancer years ago but cancer treatment had become a big business so they withheld it.
That would assume pharma execs are (1) using the cures for themselves and families but somehow keeping it quiet or (2) withholding treatment for themselves and family members, letting them die of cancer in order to generate extra income for their employers.
Neither scenario is likely given human nature.
I think it’s highly unlikely that there will ever be ‘A’ pharmaceutical cure for cancer in general. We may find different ways of managing and treating different cancers.
Crimes against humanity?
There’s no such thing as “the cure” for cancer simply because there are so many different types of cancers, with different mechanisms for how mutate or behave. So there are many different chemotherapeutic approaches and regimens to try to target them.
Some treatments can cure or potentially cure a cancer. Some patients don’t have a good enough functional status to receive particular treatments (the side effects can be worse than the cancer). Just getting into a trial requires a good functional status, because they need to reduce or eliminate other causes of morbidity and mortality to figure out how effective a trial drug is. So we don’t know all of the factors going in to whether John McCain received a particular treatment.
...bench researchers have stated that they can cure cancer in rats, but it does not convey to humans for some reason.