致癌因子（常称致癌物，carcinogen）指可引起细胞恶性变的物质。人类肿瘤大多数是由于与外界致癌物质接触而引起的。能诱发细胞癌变的物理、化学和生物因子通称为致癌物。有些致癌物可以不经过代谢活化就具有致癌性，称为直接致癌物；而大多数致癌物必须经代谢活化才具有致癌活性，称为间接致癌物。通常将其分成物理性、化学性和生物性三大类。
n. carcinogen
misc. cancerogenic substance
结果上述两种致癌因子的剂量效应相关模式都符合线性平方模型。
Results the dose response relationships of above mentioned both carcinogenesis factors at all accord with the lineal square model.
西红柿的红素含有能消除致癌因子的抗氧化剂，并且在煮熟后更易被人体吸收。
Lycopene, a powerful antioxidant capable of mopping up the harmful molecules linked to cancer, is made easier for the body to absorb when tomatoes are cooked or processed.
据美国疾控中心的一项研究表明，防晒霜中的某些化学物质一旦被皮肤吸收就会成为致癌因子。
Some ingredients found in sunscreens like oxybenzone are designed to protect the skin but may lead to cancer, according to a study by the US Center for Disease Control.
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