表没食子儿茶酸没食子酸酯用于放射损伤防治的研究进展

放射治疗是治疗恶性肿瘤的主要手段之一,在治疗过程中易引起正常组织的损伤,如放射性肺损伤、食管损伤、皮肤损伤及造血、免疫功能异常等。绿茶成分表没食子儿茶酸没食子酸酯（EGCG）是茶多酚的主要成分,具有抗炎、抗氧化、抗凋亡及调节免疫力等功能。近年来大量的动物模型实验证实,EGCG具有防治放射损伤的作用,但EGCG防治放射损伤的临床报道不多。本文将从EGCG的抗放射机制及其在放射性损伤中的应用方面,对近年来EGCG在放射损伤防治方面的研究进展进行综述,以期为EGCG的临床应用提供参考。     

FDG PET/CT摄取-体积指数对鼻咽癌预后的预测价值

目的 研究鼻咽癌患者18F-脱氧葡萄糖（FDG）PET/CT代谢体积（MTV）及摄取-体积指数（UVI）与预后的关系.方法 回顾性分析该院2002年10月至2004年7月放疗前后分别行18F-FDG PET/CT检查的37例均经病理检查证实为Ⅰ～Ⅳa期的鼻咽癌患者.患者均行6 MV X射线适形调强放射治疗.治疗后随访5年,并用Kaplan-Meier法、Log-rank检验及Cox比例风险模型分析MTV及UVI与预后的关系.结果 全组患者5年总生存率（OS）为70.3%（26/37）,5年无瘤生存率（DFS）为62.2%（23/37）.MTV＜30 cm3的患者5年OS为82.6%（19/23）和DFS为73.9%（17/23）,均高于MTV≥30 cm3的患者的50.0%（7/14）和42.9%（6/14）,差异有统计学意义（x2=5.28和4.84,P均＜0.05）.UVI＜150的患者5年OS为87.5%（21/24）,5年DFS为79.2%（19/24）,均高于UVI≥150的患者[38.5%（5/13）和30.8%（4/13）],差异均有统计学意义（x2=10.72和11.04,P＜0.01）.多因素分析显示,UVI和代谢缓解对鼻咽癌患者的预后有统计学意义.结论 18F-FDGPET/CT UVI和代谢缓解与鼻咽癌患者的预后密切相关.UVI高的患者以及放疗后未达到代谢完全缓解的患者预后较差,可能需要接受更加积极的治疗.     

FDG PET/CT摄取-体积指数对鼻咽癌预后的预测价值

Objective To evaluate the prognostic value of serial 18F-fluorodeexyglucose (FDG) PET/CT in patients with nasopharyngeal carcinoma (NPC).Methods Thirty-seven NPC patients who had 18F-FDG PET/CT scan before and after external beam intensity-modulated radiotherapy, were studied retrospectively.All patients were followed for five years.Correlation analysis between metabolic tumor volume (MTV)/uptake volume index (UVI) and survival was performed by Kaplan-Meier analysis, Log-rank test and multivariate Cox model.Results The 5-year overall survival (OS) and disease-free survival (DFS) rates were 70.3% (26/37) and 62.2% ( 23/37 ), respectively.Patients with a lower MTV (MTV＜30 cm3) had significantly higher 5-year OS ( 82.6% ( 19/23 ) ) and DFS (73.9% ( 17/23 )) rates than those with a higher MTV (OS:50.0% (7/14),x2 =5.28, P＜0.05; DFS:42.9% (6/14),x2 =4.84, P＜0.05).Patients with a lower UV1 (UVI＜150) had significantly higher 5-year OS( 87.5%( 21/24 )) and DFS (79.2% (19/24)) rates than those with a higher UVI (OS:38.5% (5/13),x2 =10.72, P＜0.01;DFS:30.8% (4/13), x2 =11.04, P＜0.01).Multivariate analysis showed that UVI and metabolic response (MR) were independent predictors of DFS.Conclusions Tumor volume parameters, UVI and MR, are independent prognostic factors for patients with NPC.Patients with a high UVI may benefit from more aggressive treatment.