近年来,大量的医学统计资料表明,儿童恶性肿瘤的发病率正在逐年升高,成为小儿死亡的重要原因之一。专家们研究认为,导致儿童身患癌症的原因主要有遗传因素,环境污染因素,胎儿期受到大量致癌物的侵害,如农药污染、被动吸烟、放射性辐射、药物损害等。儿童恶性肿瘤一般有以下特 In recent years, a large number of medical statistics show that the incidence of childhood malignancies is increasing year by year, as one of the important causes of death in children. Experts believe that the main causes of children suffering from cancer genetic factors, environmental pollution, fetal damage by a large number of carcinogens, such as pesticide contamination, passive smoking, radioactive radiation, drug damage. Malignant tumors in children generally have the following special