[Pathobiology and its clinical relevance in diffuse large B-cell lymphoma].

Diffuse large B-cell lymphoma (DLBCL) is a clinically and biologically heterogeneous disease. Remarkable effort has been exerted in the classification of DLBCL and the development of its corresponding treatment. The prognosis of patients with DLBCL receiving rituximab combination chemotherapy significantly improved in the early 2000s. However, approximately 40% of patients still develop recurrence, and the prognosis of these patients is extremely poor. Recently, the use of polatuzumab vedotin and CAR T-cell therapies has improved patient prognosis. However, it is extremely important to identify the patient group who can benefit from the efficacy of these treatments. In relation to this, the molecular pathogenesis of DLBCL should be further evaluated. Recent advancements in the genetic analysis technology have led to the discovery of unknown genetic abnormalities and gene expression patterns. The elucidation and subdivision of the molecular pathology based on these findings will be the foundation of future personalized medicine.