Eating right, exercising, achieving balance in life, getting lucky in the genetic crapshoot, and avoiding toxic crap as much as possible are all probably part of a good regimen to prevent cancer.
Once a person has cancer, it becomes much more complicated.
Nature must have the cures, and the preventatives.
Cancer isn't really like ordinary diseases for which you can find a "cure". Cancer is a process and can genetically change itself from minute to minute. Maybe the best way I can describe it is the cancer patient is like a nation which has been infiltrated by an enemy which is totally invisible, being parasitic it needs no form of sustenance, leaves no trace of it's movement until after the attack is completed, is able to move anywhere it chooses completely undetected, can choose it's weapon of choice and place of attack at will, and can morph into any form it wants from minute to minute.
Imagine you are in charge of defense, how do you find a "cure"?
I know this personally, and anyone who says they have a "cure for cancer" is bsing you.