MYC蛋白高表达弥漫大B细胞淋巴瘤45例分子特征分析

Molecular characteristics of diffuse large B-cell lymphoma with high expression of MYC:analysis of 45 cases

目的探讨MYC蛋白高表达弥漫大B细胞淋巴瘤(diffuse large B cell lymphoma,DLBCL)的分子特征。方法收集45例DLBCL临床资料。采用免疫组化EnVision法将患者分为MYC蛋白高表达/低表达组。所有样本均行DNA靶向测序,并使用LymphGen在线工具进行分子分型。运用Lymph2Cx法对细胞起源进行测定。采用χ^(2)检验和Fisher精确检验分析MYC蛋白高表达与临床病理参数的相关性。绘制生存曲线并使用Cox单因素、多因素回归分析生存相关因素。结果DLBCL病例分为MYC蛋白高表达组(n=17)和低表达组(n=28),与MYC蛋白低表达组相比,MYC蛋白高表达组PIM1、MYD88、CD79B、CD58和PRDM1的突变率较高(76.5%vs 28.6%,70.6%vs 32.1%,58.8%vs 28.6%,29.4%vs 3.6%,29.4%vs 3.6%,P均<0.05);分子亚型以MCD亚型多见(58.8%vs 10.7%,P=0.001);COO亚型GCB少见(17.6%vs 50.0%,P=0.030)。MYC蛋白高表达患者的总生存期显著缩短(P<0.05);Cox多因素分析显示,年龄是DLBCL的独立预后因素(P<0.05)。结论MYC蛋白高表达多为MCD型和ABC型,常见PIM1、MYD88、CD79B、CD58和PRDM1突变。MYC蛋白高表达的患者预后较差。

Purpose To explore the molecular features of diffuse large B-cell lymphoma(DLBCL)with high expression of MYC.Methods The clinical data of 45 cases of DLBCL were collected.Immunohistochemical EnVision method was used to classify the patients into the group with high expression of MYC and the group with low expression of MYC.All samples were subjected to DNA targeted sequencing and molecular typing was performed using the LymphGen online tool.Cellular origin was determined by using the Lymph2Cx method.The correlation between MYC overexpression and clinicopathological parameters was analyzed by the χ^(2) test and Fisher precise test.Survival curves were drawn and survival-related factors were analyzed using Cox univariate and multivariate regression.Results Cases were classified into DLBCL with high expression of MYC(n=17)and DLBCL with low expression of MYC(n=28).Compared to the group with low expression of MYC,the group with high expression of MYC had more PIM1,MYD88,CD79B,CD58 and PRDM1 mutations(76.5%vs 28.6%,70.6%vs 32.1%,58.8%vs 28.6%,29.4%vs 3.6%,29.4%vs 3.6%,P<0.05),MCD were more frequently found(58.8%vs 10.7%,P=0.001),GCB were rarely found(17.6%vs 50.0%,P=0.030).Overall survival was significantly shorter in DLBCL with high expression of MYC(P<0.05).Cox multifactorial analysis showed that age was an independent prognostic factor for DLBCL(P<0.05).Conclusion Patients with high expression of MYC were frequently characterized as MCD and ABC,and PIM1,MYD88,CD79B,CD58 and PRDM1 mutations were common.Patients with high expression of MYC had a poorer prognosis.