上浒文通大学 Causes of cancer Shanghai Jiao Tong University genetic predisposition:tumor suppressor genes deleted or damaged,etc. exposure to environmental carcinogens: radiation,chemicals (including ones in food), viruses(1/5癌症由慢性感染引起，如人类乳 头瘤病毒引起宫颈癌；乙肝病毒引起肝癌)，… In a healthy body immune system can recognize and destroy foreign cells.If .. √生活方式（吸烟；肥胖；）Shanghai Jiao Tong University Causes of cancer ü genetic predisposition: tumor suppressor genes deleted or damaged, etc. ü exposure to environmental carcinogens: radiation, chemicals (including ones in food), viruses（1／5癌症由慢性感染引起，如人类乳 头瘤病毒引起宫颈癌；乙肝病毒引起肝癌 ）, … ü In a healthy body immune system can recognize and destroy foreign cells. If … ü 生活方式（吸烟；肥胖；…）