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作 者:李梅[1] 黄晓光[2] 杨智宁[1] 詹益州[1] 林志雄[1]
机构地区:[1]汕头大学医学院附属肿瘤医院放疗科,515031 [2]汕头市中心医院放疗科
出 处:《肿瘤研究与临床》2015年第1期27-31,共5页Cancer Research and Clinic
基 金:2013年度汕头大学医学院附属肿瘤医院青年科研基金
摘 要:目的探讨颈部Ⅰb区淋巴结阴性鼻咽癌患者行调强适形放疗(IMRT)时,Ⅰb区的勾画、剂量与区域复发的关系。方法回顾性分析2008年1月至2010年10月病理确诊并接受IMRT治疗的Ⅰb区淋巴结阴性的初治鼻咽癌患者共190例,按Ⅰb区是否勾画为临床靶体积(CTV)并予预防照射分为计划预防照射(PPI)组及非计划预防照射(non—PPI)组。比较两组Ⅰb区与颌下腺的剂量差异,随访Ⅰb区的区域转移情况。结果190例Ⅰb区淋巴结阴性并接受IMRT治疗的鼻咽癌患者中,non—PPI组134例,PPI组56例。中位随访47个月,两组均未见Ib区淋巴结转移。non-PPI组Ⅰb区及颌下腺平均剂量均明显低于PPI组(均P=0.000),分别为左Ⅰb区(50.81±5.37)Gy、(59.68±3.32)Gy,左颌下腺(51.55±5.02)Gv、(59.66±3.85)Gy,右Ⅰb区(51.55±5.02)Gy、(59.66±3.85)Gy,右颌下腺(57.25±4.69)Gy、(63.41±2.88)Gy。结论对Ⅰb区淋巴结阴性鼻咽癌患者行IMRT治疗时,无须勾画Ⅰb区并予PPI。Objective To investigate the level Ⅰ b contouring, dose analysis and regional recurrence in level Ⅰ b lymph node-negative ( Ⅰ b-negative) nasopharyngeal carcinoma (NPC) patients treated by intensity-modulated radiotherapy (IMRT). Methods One hundred ninety newly-diagnosed, I b-negative NPC patients treated by IMRT were enrolled. Level Ⅰb contouring and dose prescribing in this cohort were classified into planned prophylactic irradiation (PPI) group (56 cases) and non-planned prophylactic irradiation (non-PPI) group (134 eases). The mean dose (Dmax) of the level Ⅰb bilaterally and submandibular glands (SMGs) was recorded for comparison. Results After a median follow-up of 47 months, there was no level Ⅰb regional recurrences noted in the entire group. The mean doses of level Ⅰb and the submandibular glands were significantly lower in the non-PPI group than those in the PPI group as follows: (50.81±5.37) Gy vs (59.68±3.32) Gy for the left level Ⅰb, (51.55±5.02) Gy vs (59.66±3.85) Gy for the left submandibular gland, (51.55±5.02) Gy vs (59.66±3.85) Gy for the right level Ⅰ b and (57.25±4.69) Gy vs (63.41±2.88) Gy for the right submandibular gland (all P = 0.000). Conclusion In this retrospective analysis of non-randomized single institute data, it seems unlikely that PPI to level Ⅰb is necessary in Ⅰb-negative NPC patients treated by IMRT.
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