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ORPHA:64739

Ovarian hyperstimulation syndrome

low confidenceDisorder

Also known as: OHSS

Publications

17,025

Trials

54

Interventional, condition-specific

Researchers

1,031

Distinct authors in sample

Gene link

FSHR

Strong

Readiness

5/6

Stages with a signal

Clinical definition (Orphanet)

A rare non-malformative gynecological disease affecting pre-menopausal women usually following treatment with ovarian stimulating hormones, characterized by ovarian enlargement and, to varying degrees, shift of serum from the intravascular space to the third space, mainly into the peritoneal, pleural, and to a lesser extent to the pericardial cavities. Presenting symptoms include abdomen distention, pain, nausea, and vomiting. Severity ranges from mild to life-threatening and is complicated by increased risk of thrombosis, acute hepato-renal failure, acute respiratory distress syndrome, and ovarian torsion and rupture.

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 (1)

ovarian hyperstimulation syndrome

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.”

5/6 stages with a signal

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

  1. Gene identifiedPresent

    Strong — FSHR

  2. LiteraturePresent

    17,025 matched papers (10,152 in last 10 years) Source

  3. Phenotype characterisedPresent

    21 HPO annotations (e.g. Ovarian cyst; Increased circulating gonadotropin level; Hirsutism) Source

  4. Animal modelPresent

    1 genotype model (Mus musculus) Source

  5. Orphan designationNot found

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

  6. Interventional trialPresent

    54 matched on ClinicalTrials.gov (2 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 (FSHR).

GenCC classification: Strong.

Phenotypes (Monarch / HPO)

21

Associated phenotypes · MONDO:0011972

  • Ovarian cyst
  • Increased circulating gonadotropin level
  • Hirsutism
  • Ascites
  • Nausea and vomiting

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

Animal models (Monarch / Alliance)

1

Model associations linked to this Mondo ID

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

16

Drugs / clinical candidates · MONDO_0011972

CTD chemicals (MyDisease.info)

6 associated chemicals · 10 pathways. Therapeutic evidence is listed first when present — not a treatment recommendation.

  • 17 alpha-Hydroxyprogesterone Caproate · therapeutic
  • Bromocriptine · therapeutic
  • Dextrans · therapeutic
  • Estradiol · therapeutic
  • Indomethacin · therapeutic
  • Clomiphene · marker/mechanism

Pathways: cAMP signaling pathway; Neuroactive ligand-receptor interaction; Ovarian steroidogenesis; Signal Transduction; Signaling by GPCR; Class A/1 (Rhodopsin-like receptors); Hormone ligand-binding receptors; GPCR downstream signaling

MyDisease.info · MONDO:0011972

Literature

Is anyone studying this?

17,025

17,025 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.

17,025 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).

10,152 in the last 10 years · low confidence

Phrase hits: 8,960 · MeSH hits: 290

Open Europe PMC search

Who's working on it?

1,031

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
    Mathur R6 papers · 2026

    Developmental Biology and Medicine, School of Medical Sciences, The University of Manchester, Manchester, United Kingdom.

    Papers in Europe PMC
  2. 02
    Chen X5 papers · 2026

    Department of Clinical Epidemiology, Shengjing Hospital of China Medical University, Shenyang, China.

    Papers in Europe PMC
  3. 03
    Li R5 papers · 2026

    Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing, 100191, China.

    Papers in Europe PMC
  4. 04
    Huang X4 papers · 2026

    Center of Reproductive Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China.

    Papers in Europe PMC
  5. 05
    Kim JH4 papers · 2026

    Fertility Center, CHA Bundang Women's Medical Center, CHA University Bundang Medical Center, Seongnam, South Korea.

    Papers in Europe PMC
  6. 06
    Wang J4 papers · 2026

    Department of Endocrinology, Shandong Provincial Hospital & Medical Integration, and Practice Center, Shandong University, Jinan, Shandong, China.

    Papers in Europe PMC
  7. 07
    Wang T4 papers · 2026

    The First Clinical Medical College, Shandong University of Traditional Chinese Medicine, Jinan, China.

    Papers in Europe PMC
  8. 08
    Wang Y4 papers · 2026

    Center of Reproductive Medicine, Shengjing Hospital of China Medical University, Shenyang, China.

    Papers in Europe PMC
  9. 09
    Zhang C4 papers · 2026

    Clinical and Translational Neuroscience Unit, Department of Neurology, Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, 520 East 70th Street, Starr Pavilion, 607, New York, NY, 10021, USA.

    Papers in Europe PMC
  10. 10
    Zhang X4 papers · 2026

    School of Public Health, Wenzhou Medical University, Wenzhou, Zhejiang, 325000, China.

    Papers in Europe PMC

Clinical research

Is a treatment being tested?

54

interventional trials for this specific condition

54 interventional trials matched this specific condition name; 2 currently recruiting in our sample.

Data as of 11 September 2026 · last trial check 28 July 2026

54 interventional trials — more than 77.2% of diseases in the trials denominator have none at all (5501 of 7126; this disease is at the 97.3th percentile).

low confidence · 97.3th percentile (trials denominator)

Recruiting interventional trials

From the matched ClinicalTrials.gov set

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

Observational and natural-history studies

10 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.

None of the matched observational studies is currently listed as 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 27 · after dedupe 27 · already on CT.gov 0 · kept 0 · parent 0 · uncertain 27 · 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 (27)

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 Ovarian hyperstimulation syndrome — 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.

("Ovarian hyperstimulation syndrome") OR (MESH:"Ovarian Hyperstimulation Syndrome") OR ("FSHR" OR "FSHR syndrome" OR "FSHR-related")

Run this search on Europe PMC

MeSH descriptor terms unioned into the query: Ovarian Hyperstimulation Syndrome

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

"Ovarian hyperstimulation syndrome"

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

Study-type breakdown: 54 interventional · 10 observational · 0 expanded access. Only interventional studies enter the trial headline.

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

Run this search on ClinicalTrials.gov

Synonyms dropped by stoplist: OHSS

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 (17025) is extremely high with unknown/missing prevalence — treat as possible over-matching, not proven research intensity

Ingested 2026-07-27T01:10:53.341Z