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恶性肿瘤是严重威胁人类生命的疾病之一,据国内外报道其在死因构成中约占1/5～1/4,仅亚于循环系统疾病而居第二位。目前癌瘤的病因仍不清楚,进行肿瘤死亡登记得到的死亡率资料,对了解癌瘤的人群、地理和时间分布特点,为病因研究提供线索,在恶
Malignant tumors are one of the serious diseases that threaten human life. According to reports from home and abroad, they account for about 1/5 to 1/4 of the cause of death, and they rank second in the circulatory system. At present, the etiology of cancer is still unclear. Mortality data obtained from the registration of tumor deaths provide clues for the study of causes, understanding of the geography, and time distribution characteristics of cancerous tumors.