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ORPHA:572385

Brachydactyly type B1

low confidenceSubtype of disorder

Query health: suspect — Only one of 2 strategies returned hits (phrase).

Publications

5,511

Trials

0

Interventional, condition-specific

Researchers

384

Distinct authors in sample

Gene link

ROR2

Definitive

Readiness

3/6

Stages with a signal

Clinical definition (Orphanet)

A rare subtype of brachydactyly type B characterized by hypoplasia or aplasia of the distal phalanges of digits 2-5 with or without nail , in association with fusion of the middle and distal phalanges, a broad or bifid thumb, and occasionally distal and proximal symphalangism or syndactyly. The feet are less severely affected than the hands.

How rare: <1 / 1 000 000 — fewer than one in a million. In a city the size of Kolkata, that might mean on the order of fifteen people.

Orphanet entry

Cross-references

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

Additional Mondo synonyms (3)

BDB1 · ROR2 brachydactyly type B · brachydactyly type B caused by mutation in ROR2

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

No matched interventional trial; the gene is known and literature exists — preclinical or natural-history work may still be the practical next step.

  1. Gene identifiedPresent

    Definitive — ROR2

  2. LiteraturePresent

    5,511 matched papers (3,128 in last 10 years) Source

  3. Phenotype characterisedPresent

    21 HPO annotations (e.g. Micropenis; Cutaneous finger syndactyly; Hypoplastic sacrum) 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 trialNot found

    No matched interventional trial under our ClinicalTrials.gov rules

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 (ROR2).

GenCC classification: Definitive.

Phenotypes (Monarch / HPO)

21

Associated phenotypes · MONDO:0007220

  • Micropenis
  • Cutaneous finger syndactyly
  • Hypoplastic sacrum
  • Joint contracture of the hand
  • Hemivertebrae

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?

5,511

5,511 papers — among the better-studied rare conditions, though still a fraction of common-disease literature (breast cancer: over 700,000). Median papers in the last 10 years for a rare disease in this dataset (publications denominator n=3967) is 59.

5,511 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).

3,128 in the last 10 years · low confidence

Phrase hits: 54 · MeSH hits: 0

Open Europe PMC search

Who's working on it?

384

Distinct author names in 54 sampled papers — named people below.

Who's working on it?

No interventional trial matched this name; these authors publish on it in the sampled literature — a practical starting point for contact.

  1. 01
    Wang Y4 papers · 2023

    Department of Endocrinology, Genetics and Metabolism, Beijing Children's Hospital, National Center for Children's Health, Capital Medical University, Beijing, China.

    Papers in Europe PMC
  2. 02
    Shao J3 papers · 2022

    Department of Orthopedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China.

    Papers in Europe PMC
  3. 03
    Yang Y3 papers · 2012

    Genetic Disease Research Branch, National Human Genome Research Institute, 49 Convent Drive, MSC 4472, Bethesda, MD, 20892, USA. yingzi@mail.nih.gov.

    Papers in Europe PMC
  4. 04
    Zhao H3 papers · 2021

    Department of Orthopedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China.

    Papers in Europe PMC
  5. 05
    Zhao S3 papers · 2022

    Department of Orthopedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China.

    Papers in Europe PMC
  6. 06
    Zhao Z3 papers · 2021

    Department of Orthopedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China.

    Papers in Europe PMC
  7. 07
    Andre P2 papers · 2012

    Genetic Disease Research Branch, National Human Genome Research Institute, Bethesda, Maryland 20892, USA.

    Papers in Europe PMC
  8. 08
    Cao L2 papers · 2022

    College of Kinesiology, Shenyang Sport University, No. 36 Jinqiansong East Road, Sujiatun District, Shenyang, 110102, China. lhcao@cmu.edu.cn.

    Papers in Europe PMC
  9. 09
    Chen S2 papers · 2021

    Department of Pediatrics, The Second Affiliated Hospital of Guangxi Medical University, Guangxi, China.

    Papers in Europe PMC
  10. 10
    Cheng X2 papers · 2021

    Department of Orthopedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China.

    Papers in Europe PMC

Clinical research

Is a treatment being tested?

0

interventional trials for this specific condition

No interventional trial testing a treatment matched this specific condition name on ClinicalTrials.gov (observational studies and pan-disease registries are listed separately when present).

Data as of 11 September 2026 · last trial check 11 September 2026

No matched interventional trials. This is true for 77.2% of diseases in the trials denominator (5501 of 7126). Here are the researchers publishing on it.

low confidence · 38.6th percentile (trials denominator)

Recruiting interventional trials

From the matched ClinicalTrials.gov set

No interventional trial testing a treatment was found for this specific condition name on ClinicalTrials.gov.

Broader category brachydactyly also has no matched interventional trial. See who's working on it — people publishing on this disease are often the practical next contact when no trial is listed.

Broader category: brachydactyly

0

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

Parent-category matching found a broader label but no interventional trials under it. How we count trials.

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 0 · after dedupe 0 · already on CT.gov 0 · kept 0 · parent 0 · uncertain 0 · 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).

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 Brachydactyly type B1 — 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.

("Brachydactyly type B1" OR "ROR2 brachydactyly type B" OR "brachydactyly type B caused by mutation in ROR2") OR (MESH:"Brachydactyly, Type B1") OR ("ROR2" OR "ROR2 syndrome" OR "ROR2-related")

Run this search on Europe PMC

MeSH descriptor terms unioned into the query: Brachydactyly, Type B1

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

"Brachydactyly type B1" OR "ROR2 brachydactyly type B" OR "brachydactyly type B caused by mutation in ROR2" OR "Brachydactyly, Type B1"

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

Parent-category trials query:

"brachydactyly"

Query health: suspect — strategies attempted: phrase, mesh; with hits: phrase

Run this search on ClinicalTrials.gov

Synonyms dropped by stoplist: BDB1

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
  • Publication count (5511) is implausibly high for prevalence class "<1 / 1 000 000" — treat as possible over-matching, not a measure of research intensity

Ingested 2026-07-27T18:32:58.842Z