外周血淋巴细胞与单核细胞比值变化对食管癌调强放疗预后影响

Effect of peripheral blood lymphocyte-to-monocyte ratio on prognosis of esophageal cancer patients treated with intensity-modulated radiotherapy

目的观察放疗过程中食管癌患者外周血淋巴细胞与单核细胞比值(LMR)变化趋势,分析LMR变化与预后及放射性损伤间关系,为准确评估放疗反应和疗效提供预测指标。方法回顾分析2013-2015年符合入组条件患者248例,收集放疗前、放疗期间和结束时每周外周血常规检测结果,详细记录淋巴细胞计数及单核细胞计数并计算LMR,按照每项观察指标的中位数进行分级。采用Kaplan-Meier法、Cox、Logistic模型对病变长度、病变部位、临床分期以及LMR等数据进行统计学分析。结果LMR在放疗期间呈指数下降趋势。单因素分析显示LMR平均值为总生存(P=0.011)及无进展生存(P=0.017)的影响因素,LMR平均值对局部控制率的影响也接近有统计学意义(P=0.053),但对食管癌放疗后放射性食管炎及放射性肺炎未见明显影响。多因素分析结果的分层分析仍发现LMR平均值较高者预后较好,Logistic分析发现食管病变长度和照射方式是LMR平均值的影响因素。结论LMR在放疗期间呈指数下降趋势,下降幅度越大提示患者预后不良。照射范围越大,LMR下降幅度越大,对预后影响也越明显。

Objective To observe the variation trend of the peripheral blood lymphocyte-to-monocyte ratio (LMR) during radiotherapy in patients with esophageal cancer and analyze the relationship between LMR and the radiation-induced injury, aiming to provide parameters for accurate evaluation of radiotherapy responses and clinical efficacy. Methods Clinical data of 248 eligible patients undergoing definitive radiotherapy in our department from January 2013 to December 2015, 248 were retrospectively analyzed. The routine peripheral blood examination was performed weekly before, during and at the end of radiotherapy. The absolute number of lymphocyte and monocyte was recorded to calculate the LMR. The standard classification of LMR value was conducted based on the median value of each parameter. All data including the lesion length, lesion location, clinical stage and LMR were analyzed using the Kaplan-Meier, cox and logistic regression methods, respectively. Results LMR displayed an exponential decline during radiotherapy. Univariate analysis showed that the average LMR value was the influential factor of overall survival (P=0.011) and progression-free survival (P=0.017). The mean LMR value almost exerted significant effect upon local control rate (P=0.053). No significant correlation was observed between the mean LMR value and radioactive esophagitis and pneumonitis. Stratified analysis based on the results of multivariate analysis demonstrated that patients with higher average LMR value still had longer survival. Logistic regression model revealed that the length of esophageal lesion and irradiation pattern were the influential factors of the mean LMR value. Conclusions LMR value displays an exponential decline during radiotherapy. The greater amplitude prompts the worse prognosis. The wider the irradiation field and the greater decrease in LMR exert more obvious impact on the prognosis.