The cure for cancer is a systemic cure. What I mean is this.
Scurvy is a disease that stems from the lack of vitamin C. Its symptoms wouldn't tell you this simply by looking at them. And there might be ways for controlling it other than adding vitamin C to the diet. Or, one can work on fighting each individual symptom that seems to exist.
While cancer isn't like scurvy in its symptoms and cure, it is still a systemic disease as scurvy is a systemic disease. Curing cancer basically has to do with adding nutrients to the diet, and avoiding toxins. It might have to do with exercise, and strengthening certain organs. The simple answer for cancer certainly might not be as simple as for scurvy, but it is basically the same, as it is nutrient oriented.
Overall health deteriorates even if a person doesn't get cancer directly. Check out all the healthy people who are 90-years-old. You can see the deterioration in them when you compare them with a 20-year-old.
The cure for all disease lies in the epigenetic markers a person receives in life... the chunks of bio-material that control which genes are prominent in a person, and which are not. Some of these markers come from parents. Others from the influence of the environment around a person. Others are allowed to attach to cells simply from the mindset of a person as he moves through his life. A person with certain epigenetic markers will never get cancer. Others will be prone to getting cancer very easily.
Very little is know about how a person receives and controls his epigenetic markers. Science is researching it as fast as they can. Odds are that it is so complex that a direct answer as to how to control them won't be forthcoming for a long time.
Right now, the best way to control your epigentic markers for removing cancer is, good diet, clean oxygenated water, low pollutants in all areas of life, good happy thinking and thoughts, reasonable exercise in pollution-free air. Some plants like marijuana (oil) can actually stimulate these good things in a person if used properly.
Research it.