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ORPHA:98848

Indolent systemic mastocytosis

medium confidenceDisorder

Publications

692

82.6th percentile

Trials

10

Interventional, condition-specific

Researchers

1,083

Distinct authors in sample

Gene link

—

Readiness

3/6

Stages with a signal

Clinical definition (Orphanet)

A rare, usually benign, chronic, form of systemic mastocytosis (SM) characterized by an abnormal accumulation of neoplastic mast cells (MCs) mainly in the bone marrow (BM) but also in other organs or tissues such as preferably the skin.

How rare: 1-5 / 10 000 — about one to five people per ten thousand (still uncommon, but less ultra-rare).

Orphanet entry

Cross-references

Joined from Mondo / Orphanet. MeSH labels may enter searches; UMLS / OMIM / NCIT are stored for reference.

Additional Mondo synonyms (3)

ISM · indolent systemic mastocytosis (morphologic abnormality) · ism

Research stages

Trial readiness signals

Where this condition sits on an open-data research pipeline — not how close a treatment is, and not medical advice. Empty stages often mean “not in these databases under this Mondo ID,” not “impossible.”

3/6 stages with a signal

An interventional trial matched this condition name on ClinicalTrials.gov — see trials below.

  1. Gene identifiedNot found

    No GenCC disease–gene assertion in this build

  2. LiteraturePresent

    692 matched papers (465 in last 10 years) Source

  3. Phenotype characterisedPresent

    21 HPO annotations (e.g. Hematological neoplasm; Abnormal bone marrow cell morphology; Abnormal skin morphology) Source

  4. Animal modelNot found

    No Alliance genotype “model of” associations via Monarch for these Mondo IDs

  5. Orphan designationNot found

    No FDA or EMA orphan-drug designation matched this disease via UMLS or preferred name Source

  6. Interventional trialPresent

    10 matched on ClinicalTrials.gov (1 recruiting in sample)

Biology

Genes and phenotypes

Gene–disease validity from GenCC, plus phenotypes and animal models joined from Monarch Initiative via Mondo ID — not a clinical diagnosis aid.

Do we know what causes it?

Not yet — the cause hasn't been pinned down in GenCC.

No strong gene–disease assertion joined for this Orphanet entity.

Phenotypes (Monarch / HPO)

21

Associated phenotypes · MONDO:0020331

  • Hematological neoplasm
  • Abnormal bone marrow cell morphology
  • Abnormal skin morphology
  • Increased CD25+ mast cell proportion
  • Abnormal mast cell morphology

Showing 5 of 21 — open Monarch for the full list.

Animal models (Monarch / Alliance)

None returned for this Mondo ID. Empty here is not proof that no model organism work exists under another name or gene.

Monarch fetch 2026-07-29

Therapies

Designations, candidates, and chemicals

FDA OOPD and EMA orphan designations, Open Targets clinical candidates, and CTD chemical associations via MyDisease.info. These never change the interventional-trial headline.

Orphan designation (FDA · EMA)

No designation matched this disease via UMLS or preferred name on the FDA OOPD mirror or EMA orphan register. Absence here is not proof that none exists under another wording.

Open Targets candidates

No drugs or clinical candidates returned for this Mondo ID on Open Targets.

CTD chemicals (MyDisease.info)

No CTD chemical associations returned for this Mondo ID.

Literature

Is anyone studying this?

692

692 papers have been published on this condition. That is a real research literature — still far smaller than common diseases (breast cancer: over 700,000 papers). Median papers in the last 10 years for a rare disease in this dataset (publications denominator n=3967) is 59.

692 papers since the earliest indexed year in this search — median last-10-year count for a rare disease in this dataset is 59 (publications denominator n=3967).

465 in the last 10 years · medium confidence · 82.6th percentile (publications denominator)

Phrase hits: 692 · MeSH hits: 0

Open Europe PMC search

Who's working on it?

1,083

Distinct author names in 200 sampled papers — named people below.

Who's working on it?

People publishing on this condition (sampled Europe PMC records). Affiliation is the most recent found in that sample.

  1. 01
    Akin C20 papers · 2026

    Department of Internal Medicine, Allergy Immunology, University of Michigan, Ann Arbor, Mich. Electronic address: cemakin@med.umich.edu.

    Papers in Europe PMC
  2. 02
    Reiter A14 papers · 2026

    Department of Hematology and Oncology, University Hospital Mannheim, Heidelberg University, Mannheim, Germany.

    Papers in Europe PMC
  3. 03
    Castells M13 papers · 2026

    Division of Allergy and Clinical Immunology, Brigham and Women's Hospital, Boston, Mass; Harvard Medical School, Boston, Mass. Electronic address: mcastells@bwh.harvard.edu.

    Papers in Europe PMC
  4. 04
    Hartmann K13 papers · 2026

    Department of Dermatology, University of Cologne, Cologne, Germany; Division of Allergy, Department of Dermatology, and Department of Biomedicine, University of Basel, Basel, Switzerland.

    Papers in Europe PMC
  5. 05
    Valent P13 papers · 2025

    Department of Internal Medicine I, Division of Hematology and Hemostaseology, and Ludwig Boltzmann Institute for Hematology and Oncology, Medical University of Vienna, Vienna, Austria.

    Papers in Europe PMC
  6. 06
    Niedoszytko M12 papers · 2025

    Department of Allergology, Medical University of Gdańsk, Gdańsk, Poland.

    Papers in Europe PMC
  7. 07
    Sabato V12 papers · 2026

    Faculty of Medicine and Health Sciences, Department of Immunology-Allergology-Rheumatology, University of Antwerp and Antwerp University Hospital, Antwerp, Belgium.

    Papers in Europe PMC
  8. 08
    Siebenhaar F12 papers · 2026

    Dermatological Allergology, Department of Dermatology and Allergy, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany.

    Papers in Europe PMC
  9. 09
    George TI11 papers · 2026

    Department of Pathology, University of Utah School of Medicine, Salt Lake City, UT, USA.

    Papers in Europe PMC
  10. 10
    Bonadonna P10 papers · 2026

    Allergy Unit, Verona University Hospital, Verona, Italy.

    Papers in Europe PMC

Clinical research

Is a treatment being tested?

10

interventional trials for this specific condition

10 interventional trials matched this specific condition name; 1 currently recruiting in our sample. 27 trials are registered for systemic mastocytosis, the broader category — shown separately because they may or may not enrol this specific subtype.

Data as of 11 September 2026

10 interventional trials — more than 77.2% of diseases in the trials denominator have none at all (5501 of 7126; this disease is at the 92.5th percentile).

medium confidence · 92.5th percentile (trials denominator)

Recruiting interventional trials

From the matched ClinicalTrials.gov set

10 interventional trials matched after quoted-phrase search and title/condition post-filter.

Broader category: systemic mastocytosis

27

Interventional trials for the parent category, exclusive of NCT IDs already counted above. Eligibility for this subtype is not guaranteed.

Worth raising with a clinician. How we count trials.

Recruiting under the broader category

Observational and natural-history studies

6 observational studies match this condition. These do not test a treatment and are not counted in the interventional-trial headline, but they are genuine research: natural-history work often defines the endpoints needed for a future rare-disease trial, and families may be able to enroll.

Recruiting or not-yet-recruiting

Open the complete matched search on ClinicalTrials.gov

Other registries (secondary)

Broader net from EU CTIS, ISRCTN, and ICTRP when available — deduped against ClinicalTrials.gov IDs already counted above. Dual-model LLM relevance gates what we keep. These rows are not added to the interventional headline.

raw 5 · after dedupe 5 · already on CT.gov 0 · kept 0 · parent 0 · uncertain 5 · dropped 0 · fetched 2026-07-30

Source notes: ictrp: Error: ICTRP public search unavailable (WHO portal is SPA-only; SOAP needs partnership). Tried: https://apps.who.int/tri

No secondary-registry studies passed dual-model relevance for this condition name (after dedupe).

Uncertain / not reviewed (5)

Where to find support

Condition-specific patient organisations, when Orphanet lists them, are on the disease’s Orphanet page. We also link umbrella groups that support undiagnosed and ultra-rare families.

Orphanet entry for Indolent systemic mastocytosis — check Associations / patient organisations on that page.

India — NPRD

Last verified 2026-07-26

This ORPHAcode is not on our curated NPRD list (direct or Mondo-parent match). That does not decide clinical eligibility; families in India should ask a notified Centre of Excellence about current coverage.

Hand-curated for this project. ORPHAcode mappings are best-effort and may be incomplete or imprecise for umbrella categories. Parent (Mondo) matches mean the policy lists a broader category — confirm eligibility with a Centre of Excellence. Financial entitlements summarised from public policy statements and may change. This is not official government guidance.

How we counted this

Europe PMC query (preferred label + any corrected label + Orphanet and Mondo exact synonyms, stoplisted; unioned with resolved MeSH labels when available). UMLS / OMIM / NCIT cross-references are stored on the overview but are not added to the query string.

"Indolent systemic mastocytosis" OR "indolent systemic mastocytosis (morphologic abnormality)"

Run this search on Europe PMC

ClinicalTrials.gov query (quoted phrases + MeSH via query.cond, plus recall-expansion terms when used):

"Indolent systemic mastocytosis" OR "indolent systemic mastocytosis (morphologic abnormality)"

Interventional trials matched via: phrase (mesh = registered under a MeSH descriptor no name phrase would catch; recall-expansion = gene / selected parent terms used only for trials).

Study-type breakdown: 10 interventional · 6 observational · 0 expanded access. Only interventional studies enter the trial headline.

Parent-category trials query:

"systemic mastocytosis"

Query health: ok — strategies attempted: phrase; with hits: phrase

Run this search on ClinicalTrials.gov

Synonyms dropped by stoplist: ISM

Confidence reasoning

  • Preferred label is multi-word and distinctive
  • 1 synonym(s) dropped by stoplist (may under-count)
  • No label/synonym collisions with other diseases in this corpus

Ingested 2026-07-27T05:35:00.480Z