非小细胞肺癌患者体部伽玛刀治疗后局部复发的多因素分析

目的 分析非小细胞肺癌患者体部伽玛刀治疗后局部复发的影响因素,探讨规范化治疗方案.方法 332例非小细胞肺癌患者行体部伽玛刀治疗,并定期随访,对患者的性别、年龄、卡氏评分、临床分期、病理类型、肿瘤分化程度、肿瘤体积、肿瘤部位、靶区勾画、分次剂量、等效生物剂量、化疗方案等进行单因素分析(采用χ2检验或t检验),对单因素分析有意义的临床因素应用COX模型进行多因素分析.结果 在定期随访过程中,332例患者有22例出现局部复发.多因素分析结果显示年龄大、等效生物剂量低与局部复发有关.结论 非小细胞肺癌患者体部伽玛刀治疗的等效生物剂量低是导致局部复发的重要原因.行根治性治疗的患者局部宜给予大于80Gy的等效生物剂量.

Analysis of multiple factors in local recurrence following body gamma knife radiotherapy for patients with non-small cell lung cancer

Objective To analyze the factors contributing to local recurrence following body gamma knife radiotherapy in patients with non-small cell lung cancer(NSCLC),and to explore a standard therapeutic scheme under the circumstance.Methods 332 patients with NSCLC received body gamma knife therapy and subsequent regular follow-up.Dose per fraction and total dosage used were dependent on disease condition,tumor location,tumor features and tumor size,etc.On the basis of patients' conditions and adverse effects,biological effective dose(BED) was 56-90Gy calculated with LQ model.Univariate analyses were performed including sex,age,Karnofsky performance score,clinical stage,pathological type,tumor differentiation degree,tumor size,tumor location,target volume delineation,dose per fraction,BED and chemotherapy scheme,etc.with X2 or t test.By selecting significant clinical factors in univariate analysis,multivariate analyses were performed with COX regression model.Results Of the 332 patients,local recurrence occurred in 22 cases during regular follow-up period,with average recurrence time of 10 months,and the local recurrence rate was 6.63%.The results of multivariate analysis showed that low BED,low Karnofsky score,old age,too small delineation for target volume range and central type of lung cancer were the factors related to local recurrence.Conclusions Low BED in body gamma knife radiotherapy is the significant factor of local recurrence for patients with NSCLC.BED in body gamma knife radiotherapy should be more than 80Gy for NSCLC patients who receive the radical treatment.