Primary Nonsecretory Plasma Cell Leukemia With Multiple Chromosomal Abnormalities: A Case Report.

Area of Science:

• Hematology
• Oncology
• Genetics

Background:

• Primary nonsecretory plasma cell leukemia (PCL) is an exceptionally rare variant of multiple myeloma.
• Diagnosis is challenging due to the absence of typical myeloma markers.

Observation:

• A case of primary nonsecretory PCL in a patient with no prior multiple myeloma history is presented.
• The patient showed undetectable M-protein, minimal immunoglobulin and light chain levels, and no urine BJP.
• Flow cytometry revealed no cytoplasmic light chain expression.

Findings:

• Fluorescence in situ hybridization identified IgH/BCL1 and IgH/cMyc fusion genes in tumor cells.
• Loss of the p53 signal and a split signal for IgK were observed.
• Absence of a split signal for IgL was noted.

Implications:

• This case underscores the importance of comprehensive cytogenetic analysis in diagnosing rare plasma cell disorders.
• Identifying specific fusion genes and chromosomal abnormalities aids in understanding the pathogenesis of nonsecretory PCL.
• Further research into these genetic alterations may reveal novel therapeutic targets for this aggressive malignancy.