Indeterminate cell histiocytosis in association with later occurrence of acute myeloblastic leukaemia

Area of Science:

• Dermatology
• Hematology
• Oncology

Background:

• Indeterminate cell histiocytosis (ICH) is a rare dendritic cell proliferation.
• Associations between ICH and hematologic malignancies are infrequently reported.
• The potential for clonal evolution in ICH remains incompletely understood.

Observation:

• A 39-year-old male presented with diffuse indeterminate cell histiocytosis.
• Six years post-diagnosis, the patient developed acute myeloblastic leukaemia (AML).
• Treatment included cyclophosphamide, etoposide, and vinblastine.

Findings:

• Cytomorphology and immunophenotype analyses indicated a clonal evolution from ICH to AML.
• The patient's AML presented with dyspnea, hyperpyrexia, and lung parenchymal infiltration.
• The leukaemogenic potential of etoposide is discussed in the context of ICH progression.

Implications:

• This case suggests a possible leukaemogenic role for indeterminate cell histiocytosis.
• The findings raise questions about the long-term risks associated with etoposide therapy in ICH patients.
• Further research is warranted to explore the mechanisms of clonal evolution in ICH and its association with AML.