恶性肿瘤已成为严重危害人民生命和健康的常见病,多发病。恶性肿瘤在我国死亡原因构成中占第三位,大城市已上升至第一、二位。近年来,恶性肿瘤的死亡 Malignant tumors have become common diseases that seriously endanger people’s lives and health, and are frequently diseased. Malignant neoplasms account for the third largest cause of death in China, and major cities have risen to the first and second place. In recent years, the death of malignant tumors