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目前认为,20％的癌症是由病毒诱发的,特别是以 DNA 为遗传物质的三种病毒与常见癌症有着密切的关系。乙型肝炎病毒可导致肝癌;EB 病毒可导致淋巴瘤及鼻咽癌;某种人类乳头瘤病毒可诱导宫颈癌及其它常见癌症。台湾学者进行的流行病学研究结果表明,病毒携带者患肝癌的风险程度至少是非病毒携带者的100倍,认为乙肝炎病毒是引起肝癌的主要原因。还注意到,吸烟使患肺癌的危险度增加20％。80年代初期,预防肝炎病毒感染的疫苗开始应用,从而杜绝了90％的由母亲传染给婴儿的病毒。牛津大学的学者指出,一种预防 EB 病毒
At present, it is believed that 20% of cancers are induced by viruses. In particular, the three viruses with DNA as their genetic material have a close relationship with common cancers. Hepatitis B virus can cause liver cancer; EB virus can cause lymphoma and nasopharyngeal cancer; a human papillomavirus can induce cervical cancer and other common cancers. Epidemiological studies conducted by scholars in Taiwan have shown that the risk of developing liver cancer among people living with the virus is at least 100 times that of non-viral carriers. Hepatitis B virus is considered to be the main cause of liver cancer. Also note that smoking increases the risk of lung cancer by 20%. In the early 1980s, a vaccine for the prevention of hepatitis virus infection began to be applied, thereby eliminating 90% of the viruses transmitted from mothers to infants. Scholars of Oxford University point out that one kind of prevention of EB virus