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Radiation-induced cranial nerve palsy and its causative factors in nasopharyngeal carcinoma
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- Author:
- No author available
- Journal Title:
- CHINESE JOURNAL OF RADIATION ONCOLOGY
- Issue:
- 1
- DOI:
- 10.3760/j.issn:1004-4221.2005.01.003
- Key Word:
- 鼻咽肿瘤/放射疗法;辐射损伤;颅神经
Abstract： 目的回顾性分析鼻咽癌放射治疗后放射性颅神经损伤的发生情况,并探讨其影响因素.方法512例鼻咽癌中Ⅰ、Ⅱ、Ⅲ、Ⅳ期分别为31、212、198、71例.60Co γ线或6 MV X线为放射源,面颈野或耳前野为主野加鼻前野放射,部分病例根据鼻咽肿瘤情况辅以颅底野、耳后野及鼻咽腔内后装放射.鼻咽部放射中位剂量为7130 cGy,颈部根治性放射的中位剂量为6410 cGy,预防放射的中位剂量为5480cGy.合并化疗101例.结果中位随访时间6.7年.512例中81例发生颅神经损伤,中位潜伏期4.6年.5、10年累积发生率分别为10.3%、25.4%.以第Ⅻ颅神经损伤最为多见.多因素分析显示前组颅神经放射性损伤主要与放射治疗前颅神经侵犯、化疗、鼻咽外放射总剂量及年龄有关,而后组颅神经损伤与N分期、放射野分组有关.颅神经侵犯、合并化疗、鼻咽总剂量＞7000 cGy者前组颅神经放射性损伤增加.而颈淋巴结分期晚者后组颅神经损伤增加,放射野分组中以第1组后组颅神经损伤发生的危险性大,其次为第2组,第3组后组颅神经损伤的危险性较小.34例鼻咽腔内后装放射者仅1例发生前后组颅神经损伤.结论鼻咽癌放射治疗后颅神经损伤并不少见,随着生存期延长而呈上升趋势.前、后组颅神经放射性损伤的影响因素不同,可能与其解剖部位及走向有关.控制外放射总剂量、面颈野放射有助于减少颅神经损伤.
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