Purpose To evaluate effect of the biological effective dose(BED) and overall treatment time on the actuarial survival(ASR) and the free from local failure(FLF) incidence of nasopharyngeal carcinoma treated with conventional radiotherapy.

• 目的探讨鼻咽癌常规分割放疗中等效生物剂量及总疗程时间对局控和生存的影响。