Delyedsequelae after radiotherapy for nasopharyngeal carcinoma (NPC) of 53 cases lessthan 20 years old

From 1971 through 1980, 53 patients with nasopharyngeal carcionoma were treated by radio-therapy,The 5一and 10一year survials were 55%，38 % Among the longsurivals treated By radio-therapy,some cases developed severe sequelae such as intelligence reductiondevelopment retarda-tion,growth failure, menopause or menstrual dysfunction.