RARE DISEASERESEARCH ATLAS
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ORPHA:254688

Complete hydatidiform mole

low confidenceSubtype of disorder

Also known as: Complete molar pregnancy

Publications

2,003

Trials

2

Interventional, condition-specific

Researchers

1,017

Distinct authors in sample

Gene link

—

Readiness

2/6

Stages with a signal

Clinical definition (Orphanet)

A form of hydatiform mole characterized by abnormal hyperplastic trophoblasts and hydropic villi due to fertilization of an enucleated ovocyte by one or two haploid spermatozoa that can manifest with vaginal bleeding accompanied by nausea and frequent vomiting, hyperemesis gravidarum, risk of spontaneous miscarriage, hyperthyroidism, and has the potential of developing into choriocarcinoma.

How rare: How common this is has not been clearly measured.

Orphanet entry

Cross-references

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

Additional Mondo synonyms (4)

classical hydatidiform Mole · complete Mole · complete hydatid Mole · complete molar pregnancy

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.”

2/6 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

    2,003 matched papers (875 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

    2 matched on ClinicalTrials.gov

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)

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?

2,003

2,003 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.

2,003 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).

875 in the last 10 years · low confidence

Phrase hits: 2,003 · MeSH hits: 0

Open Europe PMC search

Who's working on it?

1,017

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
    Braga A9 papers · 2026

    Faculty of Medicine, Postgraduate Program in Medical Sciences, Fluminense Federal University, Rua Ataíde Parreiras, 100, Bairro de Fátima, Niterói, RJ 24070-090, Brazil; Department of Obstetrics and Gynecology, Rio de Janeiro Trophoblastic Disease Center, Maternity School of Rio de Janeiro Federal University, Rua Laranjeiras, 180, Laranjeiras, Rio de Janeiro, RJ 22240-003, Brazil; Postgraduate Program in Applied Health Sciences, Vassouras University, Av. Expedicionário Osvaldo de Almeida Ramos, 250, Bloco 03, 2 andar, Centro, Vassouras, RJ 27700-000, Brazil. Electronic address: antonio.braga@ufrj.br.

    Papers in Europe PMC
  2. 02
    Sun SY6 papers · 2026

    Department of Obstetrics, Paulista School of Medicine, Federal University of São Paulo (EPM-UNIFESP), Sao Paulo 04023-062, SP, Brazil.

    Papers in Europe PMC
  3. 03
    Bolze PA5 papers · 2026

    Centre Français de Référence des Maladies Trophoblastiques, CHU Lyon Sud, France.

    Papers in Europe PMC
  4. 04
    Cai L5 papers · 2026

    Department of Gynecology, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou City, Zhejiang Province, PR China.

    Papers in Europe PMC
  5. 05
    Kajiyama H5 papers · 2025

    Department of Obstetrics and Gynecology, Nagoya University Graduate School of Medicine, 65 Tsurumai-Cho, Showa-Ku, Nagoya, 466-8550, Japan.

    Papers in Europe PMC
  6. 06
    Niimi K5 papers · 2025

    Department of Obstetrics and Gynecology, Nagoya University Graduate School of Medicine, 65 Tsurumai-Cho, Showa-Ku, Nagoya, 466-8550, Japan. kaorun@med.nagoya-u.ac.jp.

    Papers in Europe PMC
  7. 07
    Nishiko Y5 papers · 2025

    Department of Obstetrics and Gynecology, Nagoya University Graduate School of Medicine, 65 Tsurumai-Cho, Showa-Ku, Nagoya, 466-8550, Japan.

    Papers in Europe PMC
  8. 08
    Nishino K5 papers · 2025

    Department of Obstetrics and Gynecology, Nagoya University Graduate School of Medicine, 65 Tsurumai-Cho, Showa-Ku, Nagoya, 466-8550, Japan.

    Papers in Europe PMC
  9. 09
    Qian J5 papers · 2026

    Department of Gynecology, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou City, Zhejiang Province, PR China. Electronic address: qianjianhua@zju.edu.cn.

    Papers in Europe PMC
  10. 10
    Wang X5 papers · 2026

    Department of Pathology, Liaocheng People's Hospital, Liaocheng, China.

    Papers in Europe PMC

Clinical research

Is a treatment being tested?

2

interventional trials for this specific condition

2 interventional trials matched this specific condition name; none in our sample are currently recruiting. 6 trials are registered for hydatidiform mole, the broader category — shown separately because they may or may not enrol this specific subtype.

Data as of 27 July 2026

2 interventional trials — more than 73% of diseases in the trials denominator have none at all (5114 of 7003; this disease is at the 82.4th percentile).

low confidence · 82.4th percentile (trials denominator)

Recruiting interventional trials

From the matched ClinicalTrials.gov set

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

No currently recruiting studies in the matched set. Open the same search on ClinicalTrials.gov.

Broader category: hydatidiform mole

6

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

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.

"Complete hydatidiform mole" OR "Complete molar pregnancy" OR "classical hydatidiform Mole" OR "complete Mole" OR "complete hydatid Mole"

Run this search on Europe PMC

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

"Complete hydatidiform mole" OR "Complete molar pregnancy" OR "classical hydatidiform Mole" OR "complete Mole" OR "complete hydatid Mole"

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

Parent-category trials query:

"hydatidiform mole"

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

Run this search on ClinicalTrials.gov

Confidence reasoning

  • Preferred label is multi-word and distinctive
  • No synonyms dropped by stoplist
  • No label/synonym collisions with other diseases in this corpus
  • Publication count (2003) is extremely high with unknown/missing prevalence — treat as possible over-matching, not proven research intensity

Ingested 2026-07-27T11:05:41.194Z