Comparative clinicopathological study of primary CNS diffuse large B-cell lymphoma and intravascular large B-cell lymphoma

Hiroshi Imai, Kazuyuki Shimada, Satoko Shimada, Masato Abe, Masataka Okamoto, Kunio Kitamura, Tomohiro Kinoshita, Taizo Shiraishi, Sigeo Nakamura

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


Primary CNS diffuse large B-cell lymphoma (CNS DLBCL) is confined to the CNS, and constitutes a distinct entity. In the present study a series of 40 Japanese patients with CNS DLBCL who presented with neurological, but not systemic symptoms, was reviewed. Median survival was 18.7 months. CD5, CD10, Bcl-6, MUM-1, and Bcl-2 were positive in 30%, 10%, 84%, 100%, and 93% of patients, respectively. All CD10-negative patients had non-germinal center B-cell type. There was no significant difference in survival among the immunophenotypic subgroups. CNS DLBCL appeared to be homogenous as a group, which prompted the comparison with another distinct extranodal entity, intravascular large B-cell lymphoma (IVLBCL) in Japanese patients. CNS DLBCL patients did not differ in age, sex, or immunophenotype, including CD5 positivity, from IVLBCL patients, but were significantly less likely to have poor prognostic parameters than IVLBCL patients: the international prognostic index score was low or low-intermediate in 86% of CNS DLBCL patients and high or high-intermediate in 98% of IVLBCL patients. Notably, despite this difference, their survival curves almost overlapped. The present study highlights the issue of clinical distinctiveness of aggressive extranodal lymphomas, the peculiar migration and localization of which should be further clarified.

Original languageEnglish
Pages (from-to)431-437
Number of pages7
JournalPathology International
Issue number7
Publication statusPublished - 07-2009

All Science Journal Classification (ASJC) codes

  • Pathology and Forensic Medicine


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