立体定向放射外科治疗脑转移瘤预后因素分析

目的 评价立体定向放射外科（SRS）治疗脑转移瘤的效果及预后因素。方法回顾性分析1994-2002年在巴黎Tenon医院放疗科行SRS（X线刀）治疗的脑转移患者102例，包括单发者78例，多发者24例，102例患者共有转移灶131个，转移灶最大直径≤4cm。其中18位患者同时接受全脑放疗（WBRT），93例患者120个转移灶有影像学随访。计算患者的生存期及局控率，并对潜在预后因素分别进行单因素和多因素分析。结果总体局控率和1年局控率分别为91．7％和85.3％，102例患者的中位牛俘期为11个月。单因素分析表明只有转移灶体积是影响局控率的预后因素；KPS〉70、年龄≤60、无颅外其他器官转移以及SRS前行全脑照射是影响生存期的预后因素。多因素分析表明仅KPS评分为生存独立预后因素，结论SRS是脑转移的有效治疗方式，多种因素影响其预后。

Prognostic factors for brain metastatic tumors treated with stereotactic radiosurgery

OBJECTIVE: To assess the clinical outcome of brain metastatic tumors treated with linac-based stereotactic radiosurgery (SRS) and evaluate the potential prognostic factors. METHODS: We reviewed 102 patients with 131 brain metastatic tumors treated with a linac-based SRS from 1994 to 2002, including 78 patients with solitary and 24 with multiple brain metastases, with the diameter of tumor all within 4 cm. Among these 102 patients, 18 received planned whole-brain radiation therapy (WBRT) before or after SRS. Ninety-three patients with 120 lesions were evaluated for local tumor control analysis with follow-up imaging data. The patients' survival and local control of the tumors were estimated using Kaplan-Meier method, and the potential prognostic factors were analyzed with univariate and multivariate analysis. RESULTS: The overall local tumor control rate and the actuarial local tumor control rate at 1 year were 92.5% and 87.6%, respectively. The tumor volume was the single significant predictor for local tumor control (P=0.035). The median survival of the 102 patients was 11 months. In univariate analysis, patients aged over 60 years (P=0.038) with KPS score above 70 (P=0.001), absence of extracranial metastases (P=0.031) and administration of planned WBRT (P=0.025) were significant factors for survival. After adjustment of multivariate analysis, only KPS score was identified as the independent predictor (P=0.033). CONCLUSION: SRS is an effective method for treatment of brain metastases, and multiple factors may affect the local tumor control and survival of the patients.