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Mutational profile and prognostic significance of TP53 in diffuse large B-cell lymphoma patients treated with R-CHOP: report from an International DLBCL Rituximab-CHOP Consortium Program Study

机译:TP53在R-CHOP治疗的弥漫性大B细胞淋巴瘤患者中的突变谱和预后意义:国际DLBCL利妥昔单抗-CHOP联合计划研究报告

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摘要

TP53 mutation is an independent marker of poor prognosis in patients with diffuse large B-cell lymphoma (DLBCL) treated with cyclophosphamide, hydroxydaunorubicin, vincristine, and prednisone (CHOP) therapy. However, its prognostic value in the rituximab immunochemotherapy era remains undefined. In the present study of a large cohort of DLBCL patients treated with rituximab plus CHOP (R-CHOP), we show that those with TP53 mutations had worse overall and progression-free survival compared with those without. Unlike earlier studies of patients treated with CHOP, TP53 mutation has predictive value for R-CHOP–treated patients with either the germinal center B-cell or activated B-cell DLBCL subtypes. Furthermore, we identified the loop-sheet-helix and L3 motifs in the DNA-binding domain to be the most critical structures for maintaining p53 function. In contrast, TP53 deletion and loss of heterozygosity did not confer worse survival. If gene mutation data are not available, immunohistochemical analysis showing > 50% cells expressing p53 protein is a useful surrogate and was able to stratify patients with significantly different prognoses. We conclude that assessment of TP53 mutation status is important for stratifying R-CHOP–treated patients into distinct prognostic subsets and has significant value in the design of future therapeutic strategies.
机译:TP53突变是接受环磷酰胺,羟柔红霉素,长春新碱和泼尼松(CHOP)治疗的弥漫性大B细胞淋巴瘤(DLBCL)患者预后不良的独立标志。但是,其在利妥昔单抗免疫化学治疗时代的预后价值仍然不确定。在本研究的一大批接受利妥昔单抗加CHOP(R-CHOP)治疗的DLBCL患者中,我们显示具有TP53突变的患者与未接受TP53突变的患者相比,其总体生存率和无进展生存率均较差。与早期的CHOP研究不同,TP53突变对于生发中心B细胞或活化B细胞DLBCL亚型的R-CHOP治疗患者具有预测价值。此外,我们确定了DNA结合域中的环片螺旋和L3基序是维持p53功能的最关键结构。相反,TP53的缺失和杂合性的丧失并未赋予较差的存活率。如果没有基因突变数据,则免疫组织化学分析显示> 50%的细胞表达p53蛋白是一种有用的替代方法,并且能够将预后明显不同的患者分层。我们得出结论,对TP53突变状态的评估对于将R-CHOP治疗的患者分为不同的预后亚组非常重要,并且在未来治疗策略的设计中具有重要价值。

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