ORPHA:85435
Rheumatoid factor-positive polyarticular juvenile idiopathic arthritis
Also known as: Juvenile idiopathic rheumatoid factor-positive polyarthritis · Juvenile polyarthritis with rheumatoid factor · Rheumatoid factor-positive polyarticular JIA
Publications
188
71.5th percentile
Trials
0
Interventional, condition-specific
Researchers
2,847
Distinct authors in sample
Gene link
—
Readiness
2/6
Stages with a signal
Clinical definition (Orphanet)
A rare form of juvenile arthritis characterized by distal and symmetrical polyarthritis (more than 5 joints) with presence of rheumatoid factor and possible evolution towards the appearance of erosions and joint destruction.
How rare: 1-9 / 100 000 — about one to nine people per hundred thousand.
Cross-references
Joined from Mondo / Orphanet. MeSH labels may enter searches; UMLS / OMIM / NCIT are stored for reference.
- MONDO:0019435
- UMLS:C3890733
- NCIT:C119034
Additional Mondo synonyms (6)
juvenile idiopathic rheumatoid factor-positive polyarthritis · polyarthritis with rheumatoid factor · polyarticular JIA, RF+ · polyarticular juvenile idiopathic arthritis, RF+ · polyarticular juvenile idiopathic arthritis, rheumatoid Factor Positive · rheumatoid factor-positive polyarticular JIA
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
No specific-condition interventional trial, but broader-category trials exist — discuss eligibility with a clinician.
- Gene identifiedNot found
No GenCC disease–gene assertion in this build
- LiteraturePresent
188 matched papers (134 in last 10 years) Source
- Phenotype characterisedNot checked
Not yet enriched from Monarch / HPO
- Animal modelNot checked
Not yet enriched from Monarch / Alliance
- Orphan designationNot checked
FDA/EMA orphan-drug designation not enriched yet
- Interventional trialPartial
None under the specific name; 10 for broader category polyarticular juvenile idiopathic arthritis
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?
188
188 papers have ever been published on this condition (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=5449) is 41.
188 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).
134 in the last 10 years · high confidence · 71.5th percentile (publications denominator)
Phrase hits: 188 · MeSH hits: 0
Who's working on it?
2,847
Distinct author names in 188 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.
- 01
- 02
- 03
- 04
- 05
- 06Ravelli A22 papers · 2017
Pediatric Rheumatology, Instituto Giannina Gaslini, Genoa, Italy
Papers in Europe PMC - 07
- 08
- 09
- 10
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). 10 trials are registered for polyarticular juvenile idiopathic arthritis, the broader category — shown separately because they may or may not enrol this specific subtype.
Data as of 27 July 2026
No matched interventional trials. This is true for 73% of diseases in the trials denominator (5114 of 7003). Here are the researchers publishing on it.
high confidence · 36.5th 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.
10 interventional trials matched polyarticular juvenile idiopathic arthritis, the broader category — listed below. Those studies are not counted in the condition-specific total.
Broader category: polyarticular juvenile idiopathic arthritis
10
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
- NCT07184450·RECRUITING·Clinical Study of BCMA/CD70-targeted CAR-T Therapy for Refractory Pediatric Rheumatic Diseases
Conditions: Juvenile Dermatomyositis (JDM) · Polyarticular Juvenile Idiopathic Arthritis · Systemic Sclerosis (SSc) · Primary Sjogren's Syndrome·Matched via name phrase
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 2026-07-26This 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.
"Rheumatoid factor-positive polyarticular juvenile idiopathic arthritis" OR "Juvenile idiopathic rheumatoid factor-positive polyarthritis" OR "Juvenile polyarthritis with rheumatoid factor" OR "Rheumatoid factor-positive polyarticular JIA" OR "polyarthritis with rheumatoid factor" OR "polyarticular JIA, RF+" OR "polyarticular juvenile idiopathic arthritis, RF+" OR "polyarticular juvenile idiopathic arthritis, rheumatoid Factor Positive"
ClinicalTrials.gov query (quoted phrases + MeSH via query.cond, plus recall-expansion terms when used):
"Rheumatoid factor-positive polyarticular juvenile idiopathic arthritis" OR "Juvenile idiopathic rheumatoid factor-positive polyarthritis" OR "Juvenile polyarthritis with rheumatoid factor" OR "Rheumatoid factor-positive polyarticular JIA" OR "polyarthritis with rheumatoid factor" OR "polyarticular JIA, RF+" OR "polyarticular juvenile idiopathic arthritis, RF+" OR "polyarticular juvenile idiopathic arthritis, rheumatoid Factor Positive"
Study-type breakdown: 0 interventional · 0 observational · 0 expanded access. Only interventional studies enter the trial headline.
Parent-category trials query:
"polyarticular juvenile idiopathic arthritis"
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 2026-07-27T03:00:54.347Z