发病率儿童时期恶性肿瘤是罕见病,然儿科工作者深知该病的恶性特征,它对家庭和社会的影响极为严重。该病带来的不仅仅是痛苦,而且需要长期而昂贵的治疔,这对家庭来说是很重的负担。在美国儿童恶性肿瘤的每年发病率为12人/100,000人(0.12‰),14足岁以下儿童的总发病率为168人/100,000人(1.68‰)。young和Miller在1969—1971年普查中指出:14足岁以下的儿童中发生癌症的机会是1:595。(见表一)。但发 Incidence of Malignant Tumors in Children is a rare disease, but pediatric workers are well aware of the malignant characteristics of the disease, and its impact on the family and society is extremely serious. The disease is not only painful, but also requires long-term and expensive treatment. This is a heavy burden on the family. The annual incidence of malignancy in children in the United States is 12 per 100,000 (0.12 per 1,000), and the total incidence of children under 14 years of age is 168 per 100,000 (1.68 per 1,000). Young and Miller pointed out in the 1969-71 census that the chance of developing cancer in children under the age of 14 is 1:595. (See Table 1). But hair