局限期小细胞肺癌诱导化疗疗效与放疗时机的关系探讨

  目的   :探讨局限期小细胞肺癌（limited-disease small cell lung cancer，LSCLC）诱导化疗疗效是否会影响放疗时机的选择。   方法   分析天津医科大学肿瘤医院2009年2月至2011年4月间诱导化疗后行放疗的148例LSCLC患者临床资料，根据RE? CIST标准将2~3个周期诱导化疗后的疗效分为完全缓解、部分缓解、病情稳定和疾病进展，化疗后有效包括完全缓解和部分缓解。根据诱导化疗后是否直接行放疗将患者分为早放疗组和晚放疗组。Kaplan-Meier法进行生存分析，组间差异采用Log-rank检验。   结果   全组患者的中位生存期（overall survival，OS）为22.8个月，中位无进展生存期（progression-free survival，PFS）为13.0个月。早放疗组和晚放疗患者的中位OS分别为34.0个月和18.0个月（P=0.012），中位PFS分别为16.8个月和10.9个月（P=0.019）。两组分析发现，2~3个周期诱导化疗后有效的患者，早放疗组和晚放疗组的中位OS分别为36.9个月和22.8个月（P=0.043），PFS分别为19.4个月和11.7个月（P=0.011）；诱导化疗后无效的患者，两组的中位OS分别为18.0个月和9.5个月（P=0.015），中位PFS分别为12.4个月和10.3个月（P=0.566）。   结论   局限期小细胞肺癌行2~3个周期诱导化疗后无论是否有效，都应该尽快开始放疗。 

Relationship between the effect of induction chemotherapy and timing of radiotherapy in limited-disease small-cell lung cancer

  Objective   This study aims to analyze the relationship between the effect of induction chemotherapy and the timing of radiotherapy in limited-disease or limited-stage small-cell lung cancer (LSCLC).   Methods   Data from 148 LSCLC patients who received induction chemotherapy and radiotherapy between January 2009 and December 2012 were retrospectively analyzed. The effect of two to three cycles of induction chemotherapy was evaluated according to the RECIST version 1.1, which includes complete response (CR), partial response (PR), stable disease, and progressive disease. CR and PR were used to calculate response rate. The patients were divided into early and late groups based on immediate radiotherapy after two to three cycles of induction chemotherapy. The survival rate was analyzed using the Kaplan-Meier method. Log-rank test and Cox regression model were used to evaluate the influencing factors of the survival rate.   Results   The median overall survival (OS) and progression-free survival (PFS) were 22.8 and 13.0 months, respectively. The early and late radiotherapy groups exhibited OS of 34.0 and 18.0 months, respectively, and corresponding PFS of 16.8 and 10.9 months. In the subgroup analysis, for the patients who responded to the induction chemotherapy, the early and late radiotherapy groups showed median OS of 18.0 and 19.5 months, respectively, and corresponding PFS of 19.4 and 11.7 months. For the patients who had no response to the induction chemotherapy, the early and late radiotherapy groups exhibited median OS of 18.0 and 9.5 months, respectively, and corresponding PFS of 12.4 and 10.3 months.   Conclusion   All LSCLC patients who received two to three cycles of induction chemotherapy should receive radiotherapy as soon as possible after chemotherapy, regardless of their response to the induction chemotherapy.