Cancer isn't your typical disease, it isn't caused by a virus, nor bacteria, although infections can be the origin of it. Cancer is a disturbance in the protein-and acid- information between cells, it causes malignant growth of new tissue. Tumors. Not all tumors are deadly, as not all of them will spread, or spread to organs/vital parts.
Reasons for this can be toxins(tobacco for instance), bad diet(lack of vitamins and minerals), infections, scarred tissue(even sunburns), lesser resistance(genetic), bottom line... damaged/distorted cells can send off signals to other cells for malignant growth.
Yowyan is somehow right. Don't call him a retard or anything, it doesn't make you all look good. There's always been a cure for cancer. but it has never been in the form of a pill. And yes, believe it or not... the medicine industry loves diseases, it's their source of income. They don't mind unhealthy clients and stupidity, at all.
Many natural roots and vegetables have curing and or preventing capabilities to many forms of cancer. It's all about restoring your body's/cells balance and sustaining that balance. Not everybody is strong enough to do so, or is healthy enough. Cancer comes in three phases and the third is almost always fatal.
The first phase can often be removed by surgery, as it still is clumps of malignant cells/tumors.
the second phase is when it spreads, very dangerous and once pasts the Lymph glands, it's getting very dangerous.
The third phase is when it's spread. and there will be many clusters of malignant cells.
Cancer in total can be fought against, like it said, by many different things. Even a positive mind can work. Ginseng, Kurkuma/Turmeric, Leaf vegetable(yes, especially cole vegetables like Kale), work outs and it goes on and on.
However... it's a very complex disease, and likely it will take a very long time to find the appropriate cure for all. Anything that targets the damaged cells and stops the process of the malignant growth can be considered a cure/treatment.
However, acute blood cancer(Leukemia), for instance, will not be cured by an injection over night.