Cited by 132Mast cells and histamineGastrointestinal Tumor Research and TreatmentAcute Myeloid Leukemia Research

Systemic mastocytosis in adults: 2023 update on diagnosis, risk stratification and management

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Pardanani, Animesh·2023·American Journal of Hematology

Abstract

OVERVIEW: Systemic mastocytosis (SM) results from clonal proliferation of mast cells (MC) in extracutaneous organs. DIAGNOSIS: The major criterion is 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 expression, and presence of activating KIT mutations. RISK STRATIFICATION: Establishing SM subtype as per the International Consensus Classification/World Health Organization classification systems is an important first step. Patients either have indolent/smoldering SM (ISM/SSM) or advanced SM, including aggressive SM (ASM), SM with associated myeloid neoplasm (SM-AMN), and mast cell leukemia. Identification of poor-risk mutations (i.e., ASXL1, RUNX1, SRSF2, NRAS) further refines the risk stratification. Several risk models are available to help assign prognosis in SM patients. MANAGEMENT: Treatment goals for ISM patients are primarily directed toward anaphylaxis prevention/symptom control/osteoporosis treatment. Patients with advanced SM frequently need MC cytoreductive therapy to reverse disease-related organ dysfunction. Tyrosine kinase inhibitors (TKI) (midostaurin, avapritinib) have changed the treatment landscape in SM. While deep biochemical, histological and molecular responses have been documented with avapritinib treatment, its efficacy as monotherapy against a multimutated AMN disease component in SM-AMN patients remains unclear. Cladribine continues to have a role for MC debulking, whereas interferon-α has a diminishing role in the TKI era. Treatment of SM-AMN primarily targets the AMN component, particularly if an aggressive disease such as acute leukemia is present. Allogeneic stem cell transplant has a role in such patients. Imatinib has a therapeutic role only in the rare patient with an imatinib-sensitive KIT mutation.

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  • A tryptase > 20 ng/mL serves as a minor criterion to diagnose systemic mastocytosis.

    “A tryptase > 20 ng/mL serves as a minor criterion to diagnose systemic mastocytosis and an increase in tryptase > 20% + 2 during an acute event is a required criterion in the diagnosis of mast cell activation syndrome.”
  • Only a small subset of SM patients (approximately 10%) present with an aggressive variant, with clinical manifestations primarily dictated by C-findings.

    “Only a small subset of SM patients (approximately 10%) present with an aggressive variant, with clinical manifestations primarily dictated by the presence of C-findings (53).”
  • In cases with less specific manifestations (gastrointestinal symptoms, fatigue, neurologic/neuropsychiatric manifestations), recommendations for testing BST are not standardized.

    “In all these cases, the recommendations for testing BST are not standardized (53–55, 65).”

    From Defining “Normal” basal serum tryptase levels: a context-dependent approach to improve diagnostics in systemic mastocytosis (2025) · cites this paper as [53]

    The Diagnosis and Serum tryptase level sections (sections 2 and 2.3; page not provided) discuss symptoms that can raise suspicion of systemic mastocytosis and how basal serum tryptase is used diagnostically. Neither states whether recommendations for testing basal serum tryptase in people with gastrointestinal, fatigue, or neurologic/neuropsychiatric symptoms are standardized; searches for testing indications and those symptoms found no such passage. (LLM, conf=0.72)

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2 of the 155 references couldn’t be matched to a known paper.

Research works printed but not linked: 1

  1. Travis WD, Li CY, Yam LT, Bergstralh EJ, Swee RG. Significance of systemic mast cell disease with associated hematologic disorders. Cancer. 1988;62(5):965-972.

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Authors
Pardanani, A.
Affiliations
Mayo Clinic (US)
Corresponding author
Pardanani, Animesh
Venue
American Journal of Hematology
Publisher
Wiley
Published
2023-05-22
Volume
98
Issue
7
Pages
1097-1116
ISSN
  • 0361-8609 (ISSN-L)
  • 1096-8652
OpenAlex
W4377226862
Cited by
132
References
155
Citations by year
2026: 27 · 2025: 54 · 2024: 22 · 2023: 12 · 2021: 4 · 2020: 3 · 2018: 3 · 2017: 2 · 2016: 2 · 2014: 2 · 2013: 1
FWCI
12.60
Type
journal article
Language
en
Open access
Locations
  • American Journal of Hematology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Mast cells and histamine
  • Health Sciences › Medicine › Gastroenterology › Gastrointestinal Tumor Research and Treatment
  • Health Sciences › Medicine › Hematology › Acute Myeloid Leukemia Research
Keywords
systemic mastocytosis, KIT mutations, risk stratification, mast cell leukemia, indolent systemic mastocytosis, tyrosine kinase inhibitors, avapritinib, midostaurin, cladribine, interferon-alpha, imatinib, allogeneic stem cell transplantation, anaphylaxis, osteoporosis, ASXL1, RUNX1, SRSF2, NRAS
MeSH terms
Imatinib Mesylate, Adult, Humans, Leukemia, Mast-Cell, Mast Cells, Risk Assessment, Mastocytosis, Systemic

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