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ORPHA:99970

Dedifferentiated liposarcoma

low confidenceSubtype of disorder

Also known as: DDLS

Publications

4,016

Trials

36

Interventional, condition-specific

Researchers

1,447

Distinct authors in sample

Gene link

—

Readiness

2/6

Stages with a signal

Clinical definition (Orphanet)

Dedifferentiated liposarcoma (DDLS) is a high-grade subtype of liposarcoma (LS) that progresses from well-differentiated liposarcoma (WDLS), and most often occurs in the retroperitoneum. It is defined as a region of nonlipogenic sarcoma associated with WDLS. .

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 (2)

DDLPS · dedifferentiated liposarcoma

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

    4,016 matched papers (3,102 in last 10 years) Source

  3. Phenotype characterisedNot found

    No HPO disease–phenotype associations via Monarch for these Mondo IDs

  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 trialPresent

    36 matched on ClinicalTrials.gov (11 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)

None returned for this Mondo ID. That often means “not linked under this ID,” not “no clinical features.”

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

37

Drugs / clinical candidates · MONDO_0020563

CTD chemicals (MyDisease.info)

No CTD chemical associations returned for this Mondo ID.

Literature

Is anyone studying this?

4,016

4,016 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=3967) is 59.

4,016 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).

3,102 in the last 10 years · low confidence

Phrase hits: 4,016 · MeSH hits: 0

Open Europe PMC search

Who's working on it?

1,447

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
    Ichikawa J8 papers · 2026

    Department of Orthopaedic Surgery, Interdisciplinary Graduate School of Medicine, University of Yamanashi, Chuo, Japan.

    Papers in Europe PMC
  2. 02
    Kawasaki T8 papers · 2026

    Department of Pathology, Saitama Medical Center, Saitama Medical University, Kawagoe, Japan.

    Papers in Europe PMC
  3. 03
    Wako M8 papers · 2026

    Department of Orthopaedic Surgery, Interdisciplinary Graduate School of Medicine, University of Yamanashi, Chuo, Japan.

    Papers in Europe PMC
  4. 04
    Wang Y8 papers · 2026

    Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610213, China.

    Papers in Europe PMC
  5. 05
    Onohara K7 papers · 2025

    Department of Radiology, Interdisciplinary Graduate School of Medicine, University of Yamanashi, Chuo, Japan.

    Papers in Europe PMC
  6. 06
    Wang X6 papers · 2026

    Department of Joint Surgery, The 940th Hospital of Joint Logistic Support Force of Chinese People's Liberation Army, Lanzhou, Gansu 730050, P.R. China.

    Papers in Europe PMC
  7. 07
    Li W5 papers · 2026

    Department of Retroperitoneal Tumor and Anorectal Surgery, Peking University International Hospital Beijing 100044, China.

    Papers in Europe PMC
  8. 08
    Li Y5 papers · 2026

    Department of Radiology, Peking University Third Hospital, Beijing, China.

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

    Department of Medical Oncology, Cancer Center, West China Hospital, Sichuan University, Chengdu, China.

    Papers in Europe PMC
  10. 10
    Ochiai S5 papers · 2025

    Department of Orthopaedic Surgery, National Hospital Organization (NHO) Kofu National Hospital, Kofu, Japan.

    Papers in Europe PMC

Clinical research

Is a treatment being tested?

36

interventional trials for this specific condition

36 interventional trials matched this specific condition name; 11 currently recruiting in our sample. 98 trials are registered for liposarcoma, the broader category — shown separately because they may or may not enrol this specific subtype.

Data as of 11 September 2026

36 interventional trials — more than 77.2% of diseases in the trials denominator have none at all (5501 of 7126; this disease is at the 96.4th percentile).

low confidence · 96.4th percentile (trials denominator)

Recruiting interventional trials

From the matched ClinicalTrials.gov set

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

Broader category: liposarcoma

98

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

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.

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 8 · after dedupe 8 · already on CT.gov 0 · kept 0 · parent 0 · uncertain 8 · 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 (8)

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 Dedifferentiated liposarcoma — 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.

"Dedifferentiated liposarcoma" OR "DDLPS"

Run this search on Europe PMC

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

"Dedifferentiated liposarcoma" OR "DDLPS"

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

Parent-category trials query:

"liposarcoma"

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

Run this search on ClinicalTrials.gov

Synonyms dropped by stoplist: DDLS

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 (4016) is extremely high with unknown/missing prevalence — treat as possible over-matching, not proven research intensity

Ingested 2026-07-27T06:48:28.785Z