本文报道应用裸鼠人体鼻咽癌移植瘤(NPC—837)和流式细胞分析术研究不同剂量照射后肿瘤体积生长的延迟以及不同时相细胞在细胞周期中分布的变化。照射5.0Gy、7.5Gy、10Gy、15Gy和20Gy后,肿瘤体积分别降到其对照组的80％、70％、50％、35％和10％;特别是在照射20Gy后,肿瘤体积始终未恢复到对照组水平。同样地,照射后肿瘤生长延迟时间与照射剂量之间呈现严格的依赖效应。作者报告照射后平均G_2细 This article reports the application of human nasopharyngeal carcinoma xenografts (NPC-837) and flow cytometry in nude mice to study the delay in tumor volume growth after different doses of irradiation and the distribution of cell cycle in different phases. After irradiated with 5.0 Gy, 7.5 Gy, 10 Gy, 15 Gy, and 20 Gy, the tumor volume decreased to 80%, 70%, 50%, 35%, and 10% of the control group, respectively; the tumor volume was not recovered after 20Gy irradiation in particular. To the control group level. Similarly, there is a strictly dependent effect between the delay in the growth of the tumor after irradiation and the irradiation dose. The author reported that the average G 2 fine after irradiation