Diffuse large B cell lymphoma (DLBCL) is the most common type of non-Hodgkin lymphoma (NHL), accounting for approximately 25% of NHL cases. It is a heterogeneous group of diseases. BCL2, BCL6, and MYC are the most frequent mutated genes in DLBCL. Double-hit lymphoma (DHL) is an aggressive form of DLBCL with an unmet treatment need, in which MYC rearrangement is present with either BCL2 or BCL6 rearrangement. Patients typically present with a rapidly growing mass with B symptoms. DHL has been linked to very poor outcomes when treated with RCHOP chemotherapy. Dual-expressor lymphoma is a form of DLBCL with overexpression of MYC and BCL2/BCL6. There is a paucity of prospective trials evaluating the treatment of DHL. Retrospective series suggest that more aggressive treatment regimens such as DA-EPOCH and hyper CVAD may be more efficacious. However, there remains a lack of consensus regarding optimal treatment for DHL. Further clinical trials, including novel agents, are needed for improvement in outcomes.
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