MyD88L265P及CD79B基因突变对原发性中枢神经系统淋巴瘤预后的影响

Prognostic significance of MyD88L265P and CD79B mutations in primary central nervous system lymphoma

目的探究MyD88L265P及CD79B基因突变对原发性中枢神经系统淋巴瘤(PCNSL)患者预后的影响。方法收集2018年8月-2020年11月于兰州大学第二医院经开颅手术或立体定位活检术确诊的18例免疫功能正常(无HIV感染及免疫抑制药服用病史)的PCNSL患者临床资料进行回顾性分析。分别采用实时荧光定量PCR和一代基因测序技术检测18例PCNSL患者肿瘤组织中MyD88L265P和CD79B基因突变情况。针对可能与PCNSL首次无疾病进展生存期(PFS)和总生存期相关的指标行单因素分析,并采用Cox回归进行多因素分析。结果18例PCNSL肿瘤组织MyD88L265P突变率为38.9%,CD79B突变率为33.3%,MyD88L265P/CD79B共突变率为27.8%。单因素分析结果显示,病灶多发、病灶深部受累、肿瘤组织CD79B突变患者的PFS时间更短(P<0.05);多因素分析结果显示,病灶深部受累(HR=0.135,95%CI 0.023~0.799,P<0.05)、肿瘤组织CD79B突变(HR=0.149,95%CI 0.028~0.800,P<0.05)是PCNSL患者预后不良的独立危险因素。结论本组PCNSL患者肿瘤组织MyD88L265P、CD79B突变频率较高,这两种基因突变尤其是CD79B突变可能与PCNSL不良预后相关。

Objective To analyze the relationship between MyD88L265P and CD79B mutations in tumor tissue and the prognosis of primary central nervous system lymphoma(PCNSL).Methods 18 PCNSL patients with normal immune function(no history of HIV infection and immunosuppressants administration)who were diagnosed by craniotomy or stereotaxic biopsy in the Second Hospital of Lanzhou University from August 2018 to November 2020 were retrospectively analyzed.Real-time quantitative PCR and first-generation sequencing techniques were respectively used to detect MyD88L265P and CD79B mutations in tumor tissues of 18 PCNSL patients.Univariate analysis and Cox regression multivariate analysis were performed for indicators that may be associated with first progression-free survival(PFS)and overall survival in PCNSL.Results The mutation rate of MyD88L265P was 38.9%,the mutation rate of CD79B was 33.3%,and the co-mutation rate of MyD88L265P/CD79B was 27.8%in PCNSL tissue of 18 patients.Univariate analysis showed that the PCNSL patients with multiple lesions,deep involvement of lesions,and tissue CD79B mutation had a statistically significant shorter time of PFS(P<0.05).Multivariate analysis showed that deep lesion involvement(HR=0.135,95%CI 0.023-0.799,P<0.05)and CD79B mutation(HR=0.149,95%CI 0.028-0.800,P<0.05)in PCNSL tissue were independent prognostic factors for PCNSL patients.Conclusion The frequency of MyD88L265P and CD79B mutations was high in tumor tissues of 18 PCNSL patients,and these two gene mutations may be associated with poor prognosis of PCNSL,especially CD79B mutation.