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ORPHA:429

Hypochondroplasia

medium confidenceDisorder

Publications

1,154

90.2th percentile

Trials

6

Interventional, condition-specific

Researchers

1,286

Distinct authors in sample

Gene link

FGFR3

Definitive

Readiness

3/6

Stages with a signal

Clinical definition (Orphanet)

A primary bone with micromelia characterized by disproportionate short stature, mild lumbar lordosis and limited extension of the elbow joints.

How rare: 1-9 / 100 000 — about one to nine people per hundred thousand.

Orphanet entry

Cross-references

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

Additional Mondo synonyms (1)

hypochondroplasia

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 identifiedPresent

    Definitive — FGFR3

  2. LiteraturePresent

    1,154 matched papers (503 in last 10 years) Source

  3. Phenotype characterisedNot checked

    Not yet enriched from Monarch / HPO

  4. Animal modelNot checked

    Not yet enriched from Monarch / Alliance

  5. Orphan designationNot checked

    FDA/EMA orphan-drug designation not enriched yet

  6. Interventional trialPresent

    6 matched on ClinicalTrials.gov (4 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?

Yes — we know a specific gene responsible (FGFR3).

GenCC classification: Definitive.

Phenotypes (Monarch / HPO)

Not enriched in this build — Monarch phenotype joins were not run for this record.

Animal models (Monarch / Alliance)

Not enriched in this build.

Literature

Is anyone studying this?

1,154

1,154 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=5449) is 41.

1,154 papers since the earliest indexed year in this search — median last-10-year count for a rare disease in this dataset is 41 (publications denominator n=5449).

503 in the last 10 years · medium confidence · 90.2th percentile (publications denominator)

Phrase hits: 1,154 · MeSH hits: 0

Open Europe PMC search

Who's working on it?

1,286

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
    Bober MB7 papers · 2025

    Division of Orthogenetics, Nemours/ A.I. duPont Hospital for Children, Wilmington, DE, USA.

    Papers in Europe PMC
  2. 02
    Irving M7 papers · 2026

    Department of Clinical Genetics Guy's and St Thomas NHS, London, UK.

    Papers in Europe PMC
  3. 03
    Dauber A6 papers · 2026

    Division of Endocrinology, Children's National Hospital, Washington, DC 20010, USA.

    Papers in Europe PMC
  4. 04
    Cheung MS5 papers · 2026

    Department of Paediatric Endocrinology, Great Ormond Street Hospital, London, UK.

    Papers in Europe PMC
  5. 05
    Fano V5 papers · 2025

    Department of Growth and Development, Garrahan Hospital, Buenos Aires, Argentina.

    Papers in Europe PMC
  6. 06
    Legeai-Mallet L5 papers · 2026

    INSERM U1163, Imagine Institute, Paris University , Paris,

    Papers in Europe PMC
  7. 07
    Merchant N5 papers · 2026

    Division of Pediatric Endocrinology, Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX, USA.

    Papers in Europe PMC
  8. 08
    Savarirayan R5 papers · 2026

    Victorian Clinical Genetics Services, Murdoch Children's Research Institute, University of Melbourne, Parkville, Victoria, Australia.

    Papers in Europe PMC
  9. 09
    Del Pino M4 papers · 2025

    Department of Growth and Development, Garrahan Hospital, Buenos Aires, Argentina.

    Papers in Europe PMC
  10. 10
    Hoover-Fong J4 papers · 2026

    McKusick-Nathans Department of Genetic Medicine, Johns Hopkins University, Baltimore, MD, USA.

    Papers in Europe PMC

Clinical research

Is a treatment being tested?

6

interventional trials for this specific condition

6 interventional trials matched this specific condition name; 4 currently recruiting in our sample.

Data as of 27 July 2026

6 interventional trials — more than 73% of diseases in the trials denominator have none at all (5114 of 7003; this disease is at the 89th percentile).

medium confidence · 89th percentile (trials denominator)

Recruiting interventional trials

From the matched ClinicalTrials.gov set

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

Observational and natural-history studies

5 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

Where to find support

We do not yet link condition-specific patient organisations. These umbrella groups support undiagnosed and ultra-rare families:

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.

"Hypochondroplasia"

Run this search on Europe PMC

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

"Hypochondroplasia"

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: 6 interventional · 5 observational · 0 expanded access. Only interventional studies enter the trial headline.

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

Run this search on ClinicalTrials.gov

Confidence reasoning

  • Preferred label is short or not clearly distinctive
  • No synonyms dropped by stoplist
  • No label/synonym collisions with other diseases in this corpus

Ingested 2026-07-26T13:49:18.444Z