A rare disorder where mast cells accumulate in organs, causing a wide range of allergic and systemic symptoms.
✦ AI summary
Systemic mastocytosis (SM) is a rare condition where a type of immune cell called mast cells builds up abnormally in the bone marrow and sometimes other organs, most often driven by a genetic change in the KIT gene called D816V [9]. Doctors diagnose it by combining bone marrow findings, specific mast cell markers, blood tryptase levels, and genetic testing, and newer, more sensitive genetic tests are being developed to catch even low levels of the mutation [1][9][12]. SM ranges from milder "indolent" forms, where care focuses on preventing severe allergic reactions and managing symptoms, to more advanced forms that can overlap with blood cancers and require stronger treatments, including targeted pills that block the KIT mutation, chemotherapy-like drugs, or in select cases stem cell transplant [1][9]. Case reports show SM can look very different from person to person — sometimes with obvious skin changes, sometimes hidden with no skin symptoms at all, and sometimes evolving over many years or alongside other blood disorders like leukemia [3][5][7][10]. Beyond the disease itself, related research shows people with SM or elevated tryptase can experience wider symptoms like fatig
This is an AI-generated summary of the sources below — not medical advice. Always talk to a doctor or pharmacist about your own situation.
Systemic Mastocytosis in Adults: 2026 Update on Diagnosis, Risk Stratification and Management.
Systemic mastocytosis (SM) results from clonal proliferation of mast cells (MC) in extra-cutaneous organs. The major criterion is the presence of multifocal MC clusters in the bone marrow and/or extracutaneous organs. Minor diagnostic criteria include elevated serum tryptase level, MC CD25/CD2/CD30…
Unresponsive Systemic Mastocytosis in a Young AML With RUNX1::RUNX1T1 Fusion With Rare KIT c.1255_1257delGAC Mutation: A Clinical Deadlock.
Systemic mastocytosis (SM) with associated acute myeloid leukemia (AML) is a rare malignancy usually linked to KIT p.D816V mutations. We report a 17-year-old female with RUNX1::RUNX1T1 -positive AML and florid mast cell proliferation harboring a rare KIT exon 8 deletion (p.Asp419del). Diagnosis requ…
Chronic Myelomonocytic Leukemia: History, Pathobiology, Diagnostic Controversies, and Evolving Classification.
Chronic myelomonocytic leukemia (CMML) is a clonal myelodysplastic/myeloproliferative neoplasm characterized by sustained monocytosis, recurrent gene mutations, and a risk of transformation to acute myeloid leukemia (AML). This review examines the historical evolution of CMML as a diagnostic entity,…
Honeybee venom immunotherapy: An Australian center experience of more than 15 years.
Honeybee venom is a leading cause of anaphylaxis, and venom immunotherapy (VIT) reduces the risk of future severe reactions to stings. To retrospectively evaluate treatment practices and outcomes of honeybee VIT (HB-VIT) in an Australian center. Patients who underwent HB-VIT between July 2010 and Ju…
Hereditary alpha-tryptasemia demonstrates relative basophil enrichment without signs of cellular hyperreactivity.
Hereditary alpha-tryptasemia (HαT) is an autosomal dominant trait caused by increased tryptase alpha/beta 1 (TPSAB1) copy number, resulting in elevated serum tryptase levels. Although often asymptomatic, HαT is associated with anaphylaxis, flushing, and connective tissue abnormalities. Although mast…
Assessing real-world natural history of indolent systemic mastocytosis: A retrospective matched cohort study.
Indolent systemic mastocytosis (ISM) is the most common form of systemic mastocytosis, accounting for more than 80% of cases. Patients with ISM experience severe, unpredictable symptoms, including potentially life-threatening anaphylaxis. As a chronic condition, understanding its longitudinal natura…
Non-immunoglobulin E-mediated mechanisms of anaphylaxis.
Anaphylaxis attributable to non-immunoglobulin E (IgE)-mediated mechanisms represents an increasingly recognized and clinically challenging subset of severe hypersensitivity reactions. This review synthesizes recent advances in the understanding of IgE-independent pathways, with emphasis on literatu…