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Objective: Molecular methods have practical difficulties in identifying sub-groups of diffuse large B-cell lymphoma (DLBCL) in routine clinical practice. The goal of this study was to subclassify DLBCL patients into sub-groups by immunohistochemical method and to evaluate the effects of sub-groups on prognosis. Methods: For this purpose, the lymph node biopsy specimens of 40 patients with DLBCL have stained with monoclonal antibody immunostains of cluster of differentiation 10, B-cell lymphoma 6 and multiple myeloma oncogene 1 (MUM1). Results: As a result, 6 (15%) patients have germinal centre B-cell like (GCB) phenotype and 34 (85%) patients have non-GCB phenotype. The overall survival (OS) and event-free survival (EFS) was 31.00 ± 15.49 months and 27.66 ± 17.95 months in GCB phenotype, respectively. The OS and EFS were 23.79 ± 17.82 months and 20.97 ± 17.12 months in non-GCB phenotype, respectively. Conclusion: Multiple myeloma oncogene 1 has reached statistical significance among immunostains, and was found negatively correlated with OS and EFS. If these markers are standardized in the future, more accurate treatment schedules will be determined. [ABSTRACT FROM AUTHOR]