ORPHA:634511
Mosaic Legius syndrome
Also known as: Mosaic NF1-like syndrome · Mosaic neurofibromatosis 1-like syndrome
Publications
5
21.1th percentile
Trials
0
Interventional, condition-specific
Researchers
47
Distinct authors in sample
Gene link
—
Readiness
1/6
Stages with a signal
Clinical definition (Orphanet)
A rare mosaic form of Legius syndrome characterized by findings typical of Legius syndrome, namely multiple café-au-lait macules (CALMs) with or without axillary or inguinal freckling. Mosaic form is caused by postzygotic pathogenic variants in SPRED1 gene. In mosaic Legius syndrome the allelic/tissue distribution of the pathogenic SPRED1-variant clearly suggests mosaicsm and/or the distribution of CALMs is segmental. The can be milder than in Legius syndrome.
Cross-references
Joined from Mondo / Orphanet. MeSH labels may enter searches; UMLS / OMIM / NCIT are stored for reference.
- MONDO:0859007
- UMLS:C5816780
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.”
1/6 stages with a signal
Research-stage checklist from open sources (GenCC, literature, Monarch when enriched, ClinicalTrials.gov). Not a prognosis or care recommendation.
- Gene identifiedNot found
No GenCC disease–gene assertion in this build
- LiteraturePresent
5 matched papers (5 in last 10 years) Source
- Phenotype characterisedNot found
No HPO disease–phenotype associations via Monarch for these Mondo IDs
- Animal modelNot found
No Alliance genotype “model of” associations via Monarch for these Mondo IDs
- Orphan designationNot found
No FDA or EMA orphan-drug designation matched this disease via UMLS or preferred name Source
- 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?
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
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?
5
5 papers have ever been indexed under this name. For scale, breast cancer has over 700,000. Median papers in the last 10 years for a rare disease in this dataset (publications denominator n=3967) is 59.
5 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).
5 in the last 10 years · high confidence · 21.1th percentile (publications denominator)
Phrase hits: 5 · MeSH hits: 0
Who's working on it?
47
Distinct author names in 5 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.
- 01Florian IA2 papers · 2022
Department of Neurosurgery, Iuliu Hatieganu University of Medicine and Pharmacy, 400006 Cluj-Napoca, Romania.
Papers in Europe PMC - 02Kehrer-Sawatzki H2 papers · 2022
Institute of Human Genetics, University Hospital Ulm, University of Ulm, Albert-Einstein-Allee 11, 89081, Ulm, Germany. hildegard.kehrer-sawatzki@uni-ulm.de.
Papers in Europe PMC - 03Armat I1 paper · 2022
Cardiovascular and Transplant Emergency Institute of Târgu Mureș, 540136 Targu Mures, Romania.
Papers in Europe PMC - 04Avery RA1 paper · 2021
Division of Ophthalmology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.
Papers in Europe PMC - 05Babovic-Vuksanovic D1 paper · 2021
Department of Clinical Genomics, Mayo Clinic College of Medicine, Rochester, MN, USA.
Papers in Europe PMC - 06Berman Y1 paper · 2021
Clinical Genetics, Royal North Shore Hospital, St. Leonards, NSW, Australia and University of Sydney, Sydney, Australia.
Papers in Europe PMC - 07Blakeley J1 paper · 2021
Johns Hopkins Comprehensive Neurofibromatosis Center, Baltimore, MD, USA.
Papers in Europe PMC - 08Cooper DN1 paper · 2022
Institute of Medical Genetics, Cardiff University, Heath Park, Cardiff, CF14 4XN, UK.
Papers in Europe PMC - 09Cunha KS1 paper · 2021
Department of Pathology, Universidade Federal Fluminense, Niteroi, Brasil.
Papers in Europe PMC - 10Evans DG1 paper · 2021
Department of Genomic Medicine, St Mary's Hospital, Manchester Academic Health Sciences Centre (MAHSC), Division of Evolution and Genomic Science, University of Manchester, Manchester, UK.
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.
high 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 2026-07-30
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).
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 Mosaic Legius syndrome — check Associations / patient organisations on that page.
India — NPRD
Last verified 2026-07-26This 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.
"Mosaic Legius syndrome" OR "Mosaic NF1-like syndrome" OR "Mosaic neurofibromatosis 1-like syndrome"
ClinicalTrials.gov query (quoted phrases + MeSH via query.cond, plus recall-expansion terms when used):
"Mosaic Legius syndrome" OR "Mosaic NF1-like syndrome" OR "Mosaic neurofibromatosis 1-like syndrome"
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 multi-word and distinctive
- No synonyms dropped by stoplist
- No label/synonym collisions with other diseases in this corpus
Ingested 2026-07-27T19:28:58.395Z