IMRT时代鼻咽癌临床分期的降期新建议研究

目的 在不改变目前T、N、M分期定义基础上,提出适用于IMRT时代鼻咽癌临床分期的降期新建议。方法 回顾分析中山大学附属肿瘤医院2002—2006年536例鼻咽癌病例,采用Kaplan-Meier计算DSS率并Logrank检验,Cox法计算各亚组DSS风险比。结果 依据第7版UICC/AJCC分期系统,Ⅰ—Ⅲ期非T₃N₂M₀期患者5年DSS均在85%以上,Ⅳ_A、Ⅳ_B期的分别为71.8%、46.2%(P=0.171),而Ⅳ_C期的仅为24.0%。Ⅲ期患者中非T₃N₂M₀期患者5年DSS (91.5%)高于T₃N₂M₀期患者(78.6%)(P=0.042)。T₃N₂M₀期患者DSS经临床综合评估与Ⅳ_A—Ⅳ_B期患者相似。新Ⅰ期包括T_1-3N_0-1M₀和T_1-2N₂M₀,新Ⅱ期包括T₃N₂M₀、T₄N_0-2M₀和 TxN₃M₀期,新Ⅲ期包括TxNxM₁期,新Ⅰ、Ⅱ、Ⅲ期的5年DSS分别为93.3%、72.7%、24.0%(P=0.000),相比于新Ⅰ期,新Ⅱ、Ⅲ期的5年DSS风险比分别为4.01、16.76。结论 IMRT时代把鼻咽癌临床分期降为3个组可以更好地区分预后及指导临床治疗。

New suggestion for clinical downstaging of nasopharyngeal carcinoma in the era of intensity-modulated radiotherapy

Objective To propose a new suggestion for the clinical downstaging of nasopharyngeal carcinoma (NPC) in the era of intensity-modulated radiotherapy (IMRT) without changing the current T,N,and M staging system.Methods We reviewed the records of 536 NPC patients treated in Sun Yat-Sen University Cancer Center from January 2002 to December 2006.The Kaplan-Meier method was used to calculate the disease-specific survival (DSS) rate,and the log-rank test was used for survival difference analysis.The Cox regression model was used to calculate the hazard ratio (HR) of each subset.ResultsAccording to the 7th edition of UICC/AJCC staging system,the 5-year DSS rates of stage Ⅰ-Ⅲ patients (except T3N2M0) were all more than 85%(P>0.05),those of stage ⅣA and ⅣB patients were 71.8% and 46.2%,respectively (P=0.171),and that of stage ⅠVC patients was only 24.0%.In stage Ⅲ,the 5-year DSS rate of non-T3N2M0 patients (91.5%) was significantly higher than that of T3N2M0 patients (78.6%)(P=0.042),but there was no significant difference in DSS between T3N2M0 patients and stage ⅣA and ⅣB patients.Based on the above results,new stage Ⅰ included T1-3N0-1M0 and T1-2N2M0,new stage Ⅱ included T3N2M0,T4N0-2M0,and TxN3M0,and new stage Ⅲ included TxNxM1.The 5-year DSS rates of new stage Ⅰ,Ⅱ,and Ⅲ patients were 93.3%,72.7%,and 24.0%,respectively (P=0.000).Compared with new stage Ⅰ patients,new stage Ⅱ and Ⅲ patients had HRs of 4.01 and 16.76,respectively,for 5-year DSS.Conclusions In the era of IMRT,the new clinical staging system (stages Ⅰ,Ⅱ,and Ⅲ) helps with prognostic evaluation and clinical treatment.