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据估计,美国的头颈癌病例约占全部癌瘤的5%,推算1982年将有51,000新病人,而死于头颈部癌者约16,000人。世界其他一些地区头颈癌的比例更高,如印度孟买的头颈部肿瘤可占全身癌瘤的50%。兹将头颈部肿瘤的可能致癌因素简述如下。唇光化性辐射(波长<320nm)和烟草是最显著的致癌因素。许多证据表明,唇癌与阳光照射程度有关。60～80%唇癌发生在白皙皮肤、户外工作的白种老年人中,黑人很少见(1%),女性也较少(10%),其原因可能是皮肤色素和使用化妆品而对阳光有防护作用之故。95%发生于下唇,这是因为阳光照射时下唇暴露较多。Baker统计,29%唇癌伴发皮肤癌,但第三次美国全国
It is estimated that head and neck cancer cases account for about 5% of all cancers in the United States. It is estimated that 51,000 new patients will be lost in 1982 and about 16,000 will die of head and neck cancer. Head and neck cancer is higher in some parts of the world, with head and neck cancers in Mumbai, India, accounting for 50% of all cancers in the body. The possible carcinogenicity of head and neck cancer is summarized as follows. Lip actinic radiation (wavelength <320 nm) and tobacco are the most prominent oncogenic factors. Much evidence suggests that lip cancer is related to the level of sun exposure. 60-80% of lip agenesis occurs in fair-skinned skin. Of the white-age people working outdoors, blacks are rare (1%) and women are also less (10%), probably due to skin pigmentation and the use of cosmetics A protective effect of the reason. 95% occur in the lower lip, this is because the lower lip exposure to sunlight more. Baker statistics, 29% of lip cancer with skin cancer, but the third time the United States