Since dandelion is a diuretic and a whole body cleanse of toxins this is a good plant to use for support of your body for cancer. It is full of antioxidants and that will help with swelling and pain and it will reduce free radicals. Coupled with Burdock root it could have the potential to prevent cancer. The skin healing effects would also be good for after care of conventional treatments. A four week study of rats showed that a dandelion extract suppressed the growth and spread of breast cancer. Subsequent test tube studies showed that the same extract slowed the growth of cancer cells in the  liver, colon, prostate, and stomach tissue. More studies need to be done to confirm the results.