体重指数与恶性淋巴瘤关系病例对照研究的Meta分析

Body Mass Index and Risk of Malignant Lymphoma: A Meta-Analysis

目的采用Meta分析的方法探讨体重指数(BMI)与恶性淋巴瘤的关系。方法计算机检索Web of Science、PubMed、EMbase、CNKI、WanFang Data、VIP和CBM等国内外数据库,检索时间均从建库至2011年4月,查找BMI与恶性淋巴瘤发病关系的病例对照研究。由两位研究者按照纳入与排除标准进行资料提取和质量评价后,采用RevMan 5.0软件对各研究进行数据合并与分析。结果共纳入7个病例对照研究,合计8 416例恶性淋巴瘤患者和14 760例非恶性淋巴瘤的其他患者。7个纳入研究的质量评分均在4分以上,说明质量较可靠。Meta分析结果显示:低BMI人群的OR合并值为0.8[695%C(I0.79,0.95),P=0.003],超重人群的OR合并值为1.0[495%CI(0.98,1.11),P=0.16],肥胖人群的OR合并值为1.22[95%CI(1.04,1.43),P=0.01];对病理类型进行分层分析后发现,在弥漫性大B细胞淋巴瘤中肥胖者OR合并值为1.33[95%CI(1.18,1.50),P<0.000 01],而是否肥胖在滤泡性淋巴瘤和小淋巴细胞淋巴瘤/淋巴细胞白血病发生情况的亚组分析中,其差异无统计学意义。结论本Meta分析结果显示低BMI是恶性淋巴瘤的保护性因素,而肥胖是恶性淋巴瘤尤其是弥漫性大B细胞淋巴瘤发病的危险因素。

Objective To evaluate the relationship between body mass index （BMI） and malignant lymphoma by means of Meta-analysis. Methods Such databases as Web of Science, PubMed, EBbase, CNKI, Wanfang, VIP and CBM were searched from the date of their establishment to April 2011 to collect the case control studies on the relationship between BMI and malignant lymphoma. Two researchers independently selected studies, extracted data and assessed the quality according to the inclusive and exclusive criteria, and then conducted Meta-analyses by using RevManS.0 software for heterogeneity test and pooled OR calculation. Results Seven case control studies involving 8416 malignant lymphoma patients and 14760 other patients were included. The quality of all studies scored 4, indicating reliable quality. Meta-analyses of the low BMI, overweight and obesity population were OR=0.8, 95%CI 0.79 to 0.95, P=0.003; OR= 1.04, 95%CI 0.98 to 1.11, P=0.16; and OR=1.22 95%CI 1.04 to 1.43, P=0.01, respectively. The stratified Meta-analysis on histological subtypes showed that obesity was associated with a significantly increased risk of diffuse large B cell lymphoma （OR= 1.33 95%CI 1.18 to 1.50, P〈0.000 01）, but was not associated with the follicular lymphoma or small lymphocytic lymphoma/ chronic lymphocytic leukemia. Condusion These findings demonstrate that low BMI is associated with the decrease of malignant lymphoma, and obesity is an increasing risk of malignant lymphoma, especially, the diffuse large B cell lymphoma.