A Study of 358 Cases of Locally Advanced Nasopharyngeal Carcinoma Receiving Intensity-Modulated Radiation Therapy: Improving the Seventh Edition of the American Joint Committee on Cancer T-Staging System

作者：Qin Zhou, Yuxiang He, Yajie Zhao, Yin Wang, Weilu Kuang, Liangfang Shen · 发表于：BioMed Research International · 年份：2017 · DOI：10.1155/2017/1419676 · 被引用次数：29 · 研究领域：Head and Neck Cancer Studies、Lung Cancer Treatments and Mutations、Lung Cancer Diagnosis and Treatment

To evaluate the rationality and limitations of the seventh edition of the American Joint Committee on Cancer (the 7th AJCC edition) T-staging system for locally advanced nasopharyngeal carcinoma (NPC). The prognosis of 358 patients with stage T3/T4 NPC treated with intensity-modulated radiotherapy (IMRT) was analyzed with the Kaplan–Meier method or the log-rank test. The 7th AJCC staging system of NPC has some limitations in that the T category is neither the significant factor in OS/LRFS nor the independent prognostic factor in OS/LRFS/DMFS/DFS ( P > 0.05 ). After adjustment by anatomic structures, univariate analysis has shown that the adjusted-T category has statistical significance between T3 and T4 for OS (86.4% and 71.3%, P = 0.002 ), LRFS (97% and 90.9%, P = 0.048 ), DMFS (90.9% and 77.2%, P = 0.001 ), and DFS (86.2% and 67.5%, P = 0.000 ), and multivariate analysis has shown that the adjusted-T category is an independent prognostic factor for OS/DMFS/DFS (with the exception of LRFS). Then, GTV-P was taken into consideration. Multivariate analysis showed that these nT categories serve as suitable independent prognostic factors for OS/DMFS/DFS ( P < 0.001 ) and LRFS (HR = 3.131; 95% CI, 1.090–8.990; P = 0.0 43 ). The 7th AJCC staging system has limitations and should be improved by including the modifications suggested, such as anatomic structures and tumor volume adjustment.