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ORPHA:763

Pycnodysostosis

medium confidenceDisorder

Also known as: Pyknodysostosis

Publications

14,283

96.8th percentile

Trials

0

Interventional, condition-specific

Researchers

986

Distinct authors in sample

Gene link

CTSK

Definitive

Readiness

3/6

Stages with a signal

Clinical definition (Orphanet)

Pycnodysostosis is a genetic lysosomal disease characterized by osteosclerosis of the skeleton, short stature and brittle bones.

How rare: 1-9 / 1 000 000 — roughly one to nine people per million. In a city the size of Kolkata, perhaps a few dozen.

Orphanet entry

Cross-references

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

Additional Mondo synonyms (1)

pycnodysostosis

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 — CTSK

  2. LiteraturePresent

    14,283 matched papers (9,264 in last 10 years) Source

  3. Phenotype characterisedPresent

    91 HPO annotations (e.g. Brachydactyly; Abnormality of the dentition; Increased susceptibility to fractures) 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 (CTSK).

GenCC classification: Definitive.

Phenotypes (Monarch / HPO)

91

Associated phenotypes · MONDO:0009940

  • Brachydactyly
  • Abnormality of the dentition
  • Increased susceptibility to fractures
  • Mild conductive hearing impairment
  • Midface retrusion

Showing 5 of 91 — 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?

14,283

14,283 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.

14,283 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).

9,264 in the last 10 years · medium confidence · 96.8th percentile (publications denominator)

Phrase hits: 1,014 · MeSH hits: 0

Open Europe PMC search

Who's working on it?

986

Distinct author names in 200 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
    Gjørup H4 papers · 2024

    Department of Oral and Maxillofacial Surgery, Center for Oral Health in Rare Diseases, Aarhus University Hospital, Aarhus, Denmark.

    Papers in Europe PMC
  2. 02
    Doherty MA3 papers · 2024

    NIDO∣danmark, Gødstrup, Denmark. Electronic address: nido@rm.dk.

    Papers in Europe PMC
  3. 03
    Ebeling PR3 papers · 2025

    Department of Medicine School of Clinical Sciences Monash University Clayton Australia.

    Papers in Europe PMC
  4. 04
    Ersu R3 papers · 2026

    Marmara University, School of Medicine, Department of Otorhinolaryngology, Fevzi Çakmak Parish MuhsinYazıcıoğlust. No: 10, Kaynarca, Pendik, Istanbul, Turkey. Electronic address: rersu@yahoo.com.

    Papers in Europe PMC
  5. 05
    Ferlias N3 papers · 2024

    Section of Orthodontics, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark.

    Papers in Europe PMC
  6. 06
    Gupta N3 papers · 2024

    Department of Paediatrics (Division of Genetics), All India Institute of Medical Sciences, Ansari Nagar, New Delhi, India.

    Papers in Europe PMC
  7. 07
    Haagerup A3 papers · 2022

    NIDO∣danmark, Gødstrup, Denmark; Department of Clinical Medicine, Aarhus University, Denmark. Electronic address: annehaag@rm.dk.

    Papers in Europe PMC
  8. 08
    Jana M3 papers · 2024

    Ananya Panda, Shivanand Gamanagatti, Manisha Jana, Arun Kumar Gupta, Department of Radiodiagnosis, All India Institute of Medical Sciences, Ansari Nagar, New Delhi 110029, India.

    Papers in Europe PMC
  9. 09
    Kabra M3 papers · 2024

    Department of Paediatrics (Division of Genetics), All India Institute of Medical Sciences, Ansari Nagar, New Delhi, India.

    Papers in Europe PMC
  10. 10
    Kaur H3 papers · 2025

    Department of Radiodiagnosis, Dayanand Medical College & Hospital, India.

    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.

medium 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.

See who's working on it — people publishing on this disease are often the practical next contact when no trial is listed.

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 2026-07-29

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 Pycnodysostosis — check Associations / patient organisations on that page.

India — NPRD

Last verified 2026-07-26

Likely covered — the policy lists Osteopetrosis as a category (Group 1), and this condition is a form of it. Confirm eligibility with a Centre of Excellence.

Group 1 — one-time curative treatment

Up to ₹50 lakh per patient

Financial support for treatment at notified Centres of Excellence (figures evolved from the original ₹20 lakh Group-1 ceiling).

Policy figures change. Verify current MoHFW / CoE guidance before relying on any amount. Verify

Centres of Excellence (15)
  • All India Institute of Medical Sciences (AIIMS) — New Delhi, Delhi
  • Maulana Azad Medical College — New Delhi, Delhi
  • Sanjay Gandhi Post Graduate Institute of Medical Sciences — Lucknow, Uttar Pradesh
  • Post Graduate Institute of Medical Education and Research (PGIMER) — Chandigarh, Chandigarh
  • Centre for DNA Fingerprinting & Diagnostics with Nizam’s Institute of Medical Sciences — Hyderabad, Telangana
  • King Edward Memorial Hospital — Mumbai, Maharashtra
  • Institute of Post-Graduate Medical Education and Research (IPGMER) — Kolkata, West Bengal
  • Centre for Human Genetics with Indira Gandhi Hospital — Bengaluru, Karnataka
  • Institute of Child Health and Hospital for Children (ICH & HC) — Chennai, Tamil Nadu
  • All India Institute of Medical Sciences (AIIMS) — Jodhpur, Rajasthan
  • Sree Avittam Thirunal Hospital (SAT), Government Medical College — Thiruvananthapuram, Kerala
  • All India Institute of Medical Sciences (AIIMS) — Bhopal, Madhya Pradesh
  • Regional Institute of Medical Sciences (RIMS) — Imphal, Manipur
  • All India Institute of Medical Sciences (AIIMS) — Patna, Bihar
  • Assam Medical College & Hospital — Dibrugarh, Assam

Voluntary contributions / crowdfunding (separate from CoE funding): https://rarediseases.mohfw.gov.in/

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.

("Pycnodysostosis" OR "Pyknodysostosis") OR ("CTSK" OR "CTSK syndrome" OR "CTSK-related")

Run this search on Europe PMC

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

"Pycnodysostosis" OR "Pyknodysostosis"

Study-type breakdown: 0 interventional · 0 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 2026-07-26T15:15:50.603Z