本文报导了在Kansas城地区,通过5年(1966～1970)对白血病的观察,发现4个喉癌病人于颈部接受放疗后发生急性白血病(见表)。这4例喉癌病人,无明显的免疫或遗传方面的缺陷,在发生白血病前亦未接受任何化疗。患者接受局部放疗的最小剂量为3,000拉德。3例在接受放射前,全血计数是正常的。放射后分别在血片中出现幼 This article reports the observation of leukemia in Kansas City over five years (1966-1970) and found that four laryngeal cancer patients developed acute leukemia following radiotherapy of the neck (see table). The 4 patients with laryngeal cancer, no obvious immunological or genetic defects, in the event of leukemia also did not receive any chemotherapy. The minimum dose for patients undergoing local radiotherapy was 3,000 rad. Three patients had normal whole blood counts before receiving radiation. After radiotherapy in the blood film appear young