Primary Central Nervous System Lymphomas: A Single-center Experience

Abstract

Objectives: Primary central nervous system lymphoma (PCNSL) is a rare and aggressive form of non-Hodgkin lymphoma (NHL). This study aimed to investigate the characteristics, treatment approaches, and outcomes of patients with PCNSL in a single institution. Methods: We retrospectively analyzed 11 patients with PCNSL treated at our institution between October 2022 and July 2024. Patient demographics, clinical characteristics, treatment modalities, and outcomes were evaluated. Results: The median age of the patients was 65 years, with male predominance (63.64%). The median follow-up duration was 10 months. All patients were immunocompetent, and 90.91% had diffuse large B-cell lymphoma. At diagnosis, 81% of the patients were considered fit to receive HDMTX treatment. R-MPV was the most common first-line treatment (45.45%). The complete re- sponse rate to initial treatment was 80%. The treatment-related mortality was 9.09%. Autologous stem cell transplantation (ASCT) was performed in 72.73% of the patients, with rituximab-thiotepa-carmustine as the predominant conditioning regimen (62.50%). Treatment-related toxicities occurred in 50% of patients, and 87.50% of patients experienced transplant-related complications. The transplantation-related mortality rate was 25%. The relapse rate was 25% among the patients undergoing ASCT. The mortality rate was 36.36%, and cerebellar involvement was significantly associated with a higher mortality rate (p=0.045). Conclusion: This study demonstrated the efficacy of methotrexate-based regimens and ASCT in the treatment of PCNSL and achieved high complete response rates. However, the significant incidence of treatment-related toxicities and mortality under- scores the persistent challenges of managing this disease. In addition, the association between cerebellar involvement and in- creased mortality requires further investigation. Larger prospective studies are needed to validate these findings.