Hairy cell leukemia with CCND1/IGH fusion gene and BRAF V600E mutation

Zaid Abdel Rahman, Firas Muwalla, Liuyan Jiang, James Foran

Research output: Contribution to journalArticlepeer-review


A 75-year-old male evaluated for pancytopenia. Abnormal lymphocytes with hairy projections noted on peripheral blood. Bone marrow examination showed diffuse proliferation of CD20+ B-lymphocytes. Flowcytometry revealed monoclonal lambda-restricted B-cells expressing CD19, CD20, CD11c, CD103, CD25 and CD123, negative for CD5 and CD10. Additional staining showed positivity for cyclin-D1, Annexin-A1 and TRAP. FISH identified t(11;14). PCR was positive for BRAF V600E. Given the above findings, nonspecificity of t(11;14) and the presence of BRAF V600E; the diagnosis of HCL was favored. Patient achieved CR with infusional cladribine. Herein, we report the co-occurrence of CCND1/IGH and BRAF V600E in HCL, a rare scenario that could characterize a new subtype of HCL.

Original languageEnglish (US)
Article number100197
JournalLeukemia Research Reports
StatePublished - 2020


  • BRAF V600E
  • CCND1
  • Hairy cell
  • t(11;14)

ASJC Scopus subject areas

  • Hematology
  • Oncology


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