Relevance of different prognostic scores in primary CNS lymphoma in the era of intensified treatment regimens: A retrospective, multicenter analysis of 174 patients.

Objectives: Treatment intensification (including consolidative high‐dose chemotherapy with autologous stem cell transplantation [HDT‐ASCT]) significantly improved outcome in primary central nervous system lymphoma (PCNSL) patients. Methods: We conducted a multicenter, retrospective analysis of newly diagnosed PCNSL patients, treated with intensified treatment regimens. The following scores were evaluated in terms of overall survival (OS) and progression‐free survival (PFS): Memorial Sloan‐Kettering Cancer Center (MSKCC), International Extranodal Lymphoma Study Group (IELSG), and three‐factor (3F) prognostic score. Further, all scores were comparatively investigated for model quality and concordance. Results: Altogether, 174 PCNSL patients were included. One hundred and five patients (60.3%) underwent HDT‐ASCT. Two‐year OS and 2‐year PFS for the entire population were 73.3% and 48.5%, respectively. The MSKCC (p =.003) and 3F score (p <.001), but not the IELSG score (p =.06), had the discriminatory power to identify different risk groups for OS. In regard to concordance, the 3F score (C‐index [0.71]) outperformed both the MSKCC (C‐index [0.64]) and IELSG (C‐index [0.53]) score. Moreover, the superiority of the 3F score was shown for PFS, successfully stratifying patients in three risk groups, which also resulted in the highest C‐index (0.66). Conclusion: The comparative analysis of established PCNSL risk scores affirm the clinical utility of the 3F score stratifying the widest prognostic spectrum among PCNSL patients treated with intensified treatment approaches. [ABSTRACT FROM AUTHOR]