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从现有的所有措施中,只有预防的措施才最有可能控制肿瘤及延长寿命。很多或许是大多数肿瘤现在是可以预防的。在美国约有1/4的人曾患肿瘤,1/6的人死于肿瘤,肿瘤的死亡率仅次于心血管病。本世纪里大约每30年肿瘤死亡人数倍增,现每年死亡数超过35万,看来预防乃是控制肿瘤的最好方法。吸烟是造成肺癌的主要原因,也是造成口腔,咽喉癌的重要原因,还有一些已知的致癌情况如:暴露在紫外光及阳光下时间过久可致皮肤癌,多接触β-萘胺的工人可致膀胱癌。铀及石棉矿的矿工易得肺癌。过多接触放射线可导致白血病及甲状腺癌。子宫癌的发生也具有一定的特点,如宫颈癌往往与性生活有关如多婚多配偶者。子宫内膜癌则易
From all existing measures, only preventive measures are the most likely to control the tumor and prolong life. Many, perhaps most tumors are now preventable. About a quarter of the people in the United States have had a tumor, and one in six people have died of a tumor that is second only to cardiovascular disease in terms of mortality. Tumor deaths multiply by about every 30 years in this century and now amount to more than 350,000 deaths each year. It seems that prevention is the best way to control cancer. Smoking is the main cause of lung cancer is also an important cause of mouth, throat cancer, there are some known carcinogenic conditions such as: exposure to ultraviolet light and sunlight for too long can cause skin cancer, more contact with β-naphthylamine Workers can cause bladder cancer. Uranium and asbestos miners easily get lung cancer. Excessive exposure to radiation can cause leukemia and thyroid cancer. The occurrence of uterine cancer also has certain characteristics, such as cervical cancer are often related to sexual life, such as multi-spouse polygamy. Endometrial cancer is easy