There are other things one can do to help prevent cancer...
Use coconut oil...
If you want to use a polyunsaturated oil as a food, it is worthwhile to remember what its effects are: it suppresses metabolism and promotes obesity, is immunosuppressive; causes inflammation and shock; is required for alcoholic liver cirrhosis; sensitizes to radiation damage; accelerates formation of aging pigment, cataracts, retinal degeneration; promotes free radical damage and excitoxicity; causes cancer and accelerates its growth; is toxic to the heart muscle and promotes atherosclerosis; can cause brain edema, diabetes, excessive vascular permeability, precocious puberty, progesterone deficiency, skin wrinkling and other signs of aging.
Cancer can’t occur unless there are unsaturated oils in the diet. (C. lp, et al., Cancer Res. 45, 1985.) Alcoholic cirrhosis of the liver cannot occur unless there are unsaturated oils in the diet. (Nanji and French, Life Sciences. 44, 1989.) Heart disease can be produced by unsaturated oils, and prevented by adding saturated oils to the diet. (J.K.G. Kramer, et al., Lipids 17, 372, 1983.)