癌症的化学预防能够预防癌症的化学化合物，现已鉴定出几百种，包括合成化合物和饮食中天然发生的化合物。流行病学研究证明，增加蔬菜和水果的摄入可使许多器官中癌的危险性降低，特别是肺和胃肠道；另外也鉴定了普通食物中大量有预防作用的物质，如十字花科蔬菜，柑橘属... Chemoprevention of Cancer Chemical compounds that can prevent cancer. Hundreds of species have been identified, including synthetic compounds and naturally occurring compounds in the diet. Epidemiological studies have shown that increasing the intake of vegetables and fruits can reduce the risk of cancer in many organs, especially the lungs and the gastrointestinal tract; in addition, a large number of substances with preventive effects in common foods are identified, such as Cruciferae. Vegetables, citrus...