Abstract
Patients with systemic mastocytosis (SM) may acquire an associated hematologic non-mast cell (MC)-lineage disease (AHNMD). In most cases, a myeloid neoplasm is diagnosed, whereas the occurrence of a lymphoproliferative disease is an extremely rare event. We report on a patient with indolent SM associated with small lymphocytic lymphoma (SLL). The patient presented with lymphadenopathy, maculopapular exanthema, and elevated serum tryptase. The bone marrow biopsy showed focal MC aggregates together with SLL. As assessed by immunostaining, neoplastic MC were found to exhibit CD117 and CD25 but did not display CD5 or CD20, whereas SLL cells were found to coexpress CD5 and CD20 but did not express MC antigens. The KIT mutation D816V was detected in sorted CD34(+) cells and unfractionated marrow cells but not in CD5(+) SLL cells, confirming the coexistence of 2 distinct neoplasms.
Publication types
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Case Reports
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Research Support, Non-U.S. Gov't
MeSH terms
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Antineoplastic Combined Chemotherapy Protocols / therapeutic use
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Biomarkers, Tumor / metabolism
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Bone Marrow Cells / metabolism
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Bone Marrow Cells / pathology
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DNA Mutational Analysis
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DNA, Neoplasm / analysis
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Flow Cytometry
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Humans
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Leukemia, Lymphocytic, Chronic, B-Cell / drug therapy
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Leukemia, Lymphocytic, Chronic, B-Cell / genetics
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Leukemia, Lymphocytic, Chronic, B-Cell / metabolism
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Leukemia, Lymphocytic, Chronic, B-Cell / pathology*
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Male
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Mastocytosis, Systemic / drug therapy
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Mastocytosis, Systemic / genetics
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Mastocytosis, Systemic / metabolism
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Mastocytosis, Systemic / pathology*
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Middle Aged
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Neoplasms, Multiple Primary / genetics
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Neoplasms, Multiple Primary / metabolism
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Neoplasms, Multiple Primary / pathology*
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Proto-Oncogene Proteins c-kit / genetics
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Proto-Oncogene Proteins c-kit / metabolism
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Treatment Outcome
Substances
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Biomarkers, Tumor
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DNA, Neoplasm
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Proto-Oncogene Proteins c-kit