Clinical and Pathological Features That Predict High-Grade B-Cell Lymphomas (HGBCLs) with MYC and BCL2 or BCL6...

Area of Science:

• Hematology
• Oncology
• Genetics

Background:

• High-grade B-cell lymphomas (HGBCLs) with MYC and BCL2 or BCL6 translocations, known as double-hit lymphomas (DHL), represent aggressive hematologic malignancies.
• Accurate differentiation of DHL from non-DHL HGBCLs is crucial for determining appropriate, potentially more intensive, treatment strategies.
• Identifying predictive features can guide the selection of HGBCL cases for fluorescence in situ hybridization (FISH) testing, which may not be universally accessible or cost-effective.

Purpose of the Study:

• To identify predictive clinicopathological, morphological, and immunophenotypic features that can assist in selecting HGBCLs for FISH testing.
• To compare characteristics between DHL and non-DHL HGBCLs.
• To differentiate between MYC/BCL2 and MYC/BCL6 DHL subtypes.

Main Methods:

• A PRISMA systematic review and meta-analysis was performed.
• Data were extracted from 29 studies across four major databases (PubMed, Embase, Web of Science, Scopus).
• Risk ratios (RRs) were calculated to compare features between different lymphoma groups.

Main Results:

• DHL patients exhibited higher Ann Arbor stage, International Prognostic Index (IPI) score, and lactate dehydrogenase levels compared to non-DHL HGBCL patients.
• A germinal center B-cell-like (GCB) immunophenotype was significantly associated with DHL (RR 1.21, p=0.043).
• MYC/BCL6 DHL was more frequently associated with extranodal disease and central nervous system involvement compared to MYC/BCL2 DHL.

Conclusions:

• DHL is associated with features indicative of aggressive disease.
• The GCB immunophenotype is a significant histopathological predictor for MYC/BCL2 DHL.
• Further prospective studies are needed to establish a reliable screening strategy for DHL due to heterogeneity and variations in diagnostic criteria across studies.