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ORPHA:2800

Extramammary Paget disease

low confidenceDisorder

Publications

3,159

Trials

12

Interventional, condition-specific

Researchers

1,086

Distinct authors in sample

Gene link

—

Readiness

2/6

Stages with a signal

Clinical definition (Orphanet)

A rare skin tumor characterized by predominantly intraepithelial growth of an adenocarcinoma which may either arise primarily in the skin (primary extramammary Paget disease) or result from intraepithelial spread of a visceral carcinoma (secondary extramammary Paget disease). The lesion is typically located in the anogenital region, presenting as a scaly, oozing, pruritic or painful erythematous plaque often resembling eczema. It may exhibit an invasive component with a significant risk of lymph node metastasis.

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 (6)

Extramammary Paget's disease · Paget disease Extramammary · Paget's disease of skin · Paget's disease of the skin · Paget's skin disease · extramammary Paget disease

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

    3,159 matched papers (1,247 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

    12 matched on ClinicalTrials.gov (8 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?

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?

3,159

3,159 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.

3,159 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).

1,247 in the last 10 years · low confidence

Phrase hits: 3,159 · MeSH hits: 0

Open Europe PMC search

Who's working on it?

1,086

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
    Li H7 papers · 2026

    Department of Dermatology and Venerology, Peking University First Hospital, Beijing, China.

    Papers in Europe PMC
  2. 02
    Nakamura Y7 papers · 2026

    Department of Dermatology, Keio University School of Medicine, Tokyo, Japan. Electronic address: yn1109@keio.jp.

    Papers in Europe PMC
  3. 03
    Zhang G7 papers · 2026

    Department of Dermatology and Venerology, Peking University First Hospital, Beijing, China.

    Papers in Europe PMC
  4. 04
    Yamazaki N6 papers · 2026

    Department of Dermatologic Oncology, National Cancer Center Hospital, Tokyo, Japan.

    Papers in Europe PMC
  5. 05
    Chen X5 papers · 2025

    Department of Gastroenterology, Shanghai Jiao Tong University Medical School Affiliated Ruijin Hospital, Shanghai, China.

    Papers in Europe PMC
  6. 06
    Fukushima S5 papers · 2026

    Department of Dermatology and Plastic Surgery, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan.

    Papers in Europe PMC
  7. 07
    Funakoshi T5 papers · 2024

    Department of Dermatology, Keio University School of Medicine, Tokyo, Japan.

    Papers in Europe PMC
  8. 08
    Kajihara I5 papers · 2026

    Department of Dermatology and Plastic Surgery, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan.

    Papers in Europe PMC
  9. 09
    Namikawa K5 papers · 2025

    Department of Dermatologic Oncology, National Cancer Center Hospital, Tokyo, Japan.

    Papers in Europe PMC
  10. 10
    Ogata D5 papers · 2025

    Department of Dermatologic Oncology, National Cancer Center Hospital, Tokyo, Japan.

    Papers in Europe PMC

Clinical research

Is a treatment being tested?

12

interventional trials for this specific condition

12 interventional trials matched this specific condition name; 8 currently recruiting in our sample. 5 trials are registered for Paget disease, the broader category — shown separately because they may or may not enrol this specific subtype.

Data as of 27 July 2026

12 interventional trials — more than 73% of diseases in the trials denominator have none at all (5114 of 7003; this disease is at the 92.5th percentile).

low confidence · 92.5th percentile (trials denominator)

Recruiting interventional trials

From the matched ClinicalTrials.gov set

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

Broader category: Paget disease

5

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.

Observational and natural-history studies

1 observational study matches 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.

"Extramammary Paget disease" OR "Extramammary Paget's disease" OR "Paget disease Extramammary" OR "Paget's disease of skin" OR "Paget's disease of the skin" OR "Paget's skin disease"

Run this search on Europe PMC

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

"Extramammary Paget disease" OR "Extramammary Paget's disease" OR "Paget disease Extramammary" OR "Paget's disease of skin" OR "Paget's disease of the skin" OR "Paget's skin disease"

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: 12 interventional · 1 observational · 0 expanded access. Only interventional studies enter the trial headline.

Parent-category trials query:

"Paget disease"

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 (3159) is extremely high with unknown/missing prevalence — treat as possible over-matching, not proven research intensity

Ingested 2026-07-26T21:14:41.764Z