Rituximab in relapsed or refractory hairy cell leukemia

Deborah A. Thomas, Susan O'Brien, Carlos Bueso-Ramos, Stefan Faderl, Michael J. Keating, Francis J. Giles, Jorge Cortes, Hagop M. Kantarjian

Research output: Contribution to journalArticlepeer-review

149 Scopus citations


The purpose of this study was to investigate the efficacy and safety of the monoclonal antibody, rituximab, in relapsed or refractory hairy cell leukemia (HCL). Fifteen patients with relapsed or primary refractory HCL after nucleoside analogs received rituximab 375 mg/m2 weekly for a total of 8 planned doses. An additional 4 doses could be administered to responders who had not achieved complete response (CR). The overall response rate was 80%. Eight patients (53%) achieved CR, 2 (13%) attained CR by hematologic parameters with residual marrow disease (1% to 5% marrow hairy cells), and 2 (13%) had a partial response. Of the 12 responders followed for a median of 32 months (range, 8 to 45+ months), 5 patients (42%) had progression of disease 8, 12, 18, 23, and 39 months from the start of therapy. Three patients failed to respond (after 4, 6, or 8 doses). Reductions in serum interleukin-2 receptor (sIL-2R) levels correlated with response. Toxicity was minimal, and no infectious episodes were observed. Rituximab has significant activity and minimal toxicity in HCL and warrants further study. Rituximab should be explored further in HCL with regard to eradication of minimal residual disease and in combination with nucleoside analogs.

Original languageEnglish (US)
Pages (from-to)3906-3911
Number of pages6
Issue number12
StatePublished - Dec 1 2003
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Immunology
  • Hematology
  • Cell Biology


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