CAUSES-
chemical: diet, job, smoking alcohol radiation: UV, gamma rays, radioactivity, radon
virus; hepatitis B, humpn pailoma, Hep C, epstein barr
Genetic predisposition- breast cancer, retinoblastoma, polyposis coli, hereditary non- polyposis coli
immunosuppression.
Cofactors- hormones (oestrogen) breast cancer, (testosterone)prostate cancer, malaria Burkitt's lymphoma all stimulate cell proliferation.