IL17RA interleukin 17 receptor A
ENSG00000177663 · protein coding · Open Targets profile
Receptor for IL17A and IL17F, major effector cytokines of innate and adaptive immune system involved in antimicrobial host defense and maintenance of tissue integrity. Receptor for IL17A (PubMed:17911633, PubMed:9367539). Receptor for IL17F (PubMed:17911633, PubMed:19838198). Binds to IL17A with higher affinity than to IL17F (PubMed:17911633). Binds IL17A and IL17F homodimers as part of a heterodimeric complex with IL17RC (PubMed:16785495). Also binds heterodimers formed by IL17A and IL17F as part of a heterodimeric complex with IL17RC (PubMed:18684971). Cytokine binding triggers homotypic interaction of IL17RA and IL17RC chains with TRAF3IP2 adapter, leading to TRAF6-mediated activation of NF-kappa-B and MAPkinase pathways, ultimately resulting in transcriptional activation of cytokines, chemokines, antimicrobial peptides and matrix metalloproteinases, with potential strong immune inflammation (PubMed:16785495, PubMed:17911633, PubMed:18684971, PubMed:21350122, PubMed:24120361). Involved in antimicrobial host defense primarily promoting neutrophil activation and recruitment at infection sites to destroy extracellular bacteria and fungi (By similarity). In secondary lymphoid organs, contributes to germinal center formation by regulating the chemotactic response of B cells to CXCL12 and CXCL13, enhancing retention of B cells within the germinal centers, B cell somatic hypermutation rate and selection toward plasma cells (By similarity). Plays a role in the maintenance of the integrity of epithelial barriers during homeostasis and pathogen infection. Stimulates the production of antimicrobial beta-defensins DEFB1, DEFB103A, and DEFB104A by mucosal epithelial cells, limiting the entry of microbes through the epithelial barriers (By similarity). Involved in antiviral host defense through various mechanisms. Enhances immunity against West Nile virus by promoting T cell cytotoxicity. Contributes to Influenza virus clearance by driving the differentiation of B-1a B cells, providing for production of virus-specific IgM antibodies at first line of host defense (By similarity). Receptor for IL17C as part of a heterodimeric complex with IL17RE (PubMed:21993848). {ECO:0000250|UniProtKB:Q60943, ECO:0000269|PubMed:16785495, ECO:0000269|PubMed:17911633, ECO:0000269|PubMed:18684971, ECO:0000269|PubMed:19838198, ECO:0000269|PubMed:21350122, ECO:0000269|PubMed:21993848, ECO:0000269|PubMed:24120361, ECO:0000269|PubMed:9367539}.
Each row is a cancer, strongest overall evidence first. The two dots show how strong the inherited (germline) and tumour-mutation (somatic) evidence is; the line between them is the gap.
Scores run from 0 (no evidence) to 1 (strongest). A missing dot at 0 means Open Targets holds no evidence of that kind. Source: Open Targets Platform, fetched live.
Tractability
- Antibody
- Approved Drug, UniProt loc high conf, GO CC high conf, UniProt SigP or TMHMM
- PROTAC
- Database Ubiquitination, Half-life Data
gnomAD loss of function constraint: o/e 0.6744499802589417 (upper bound 0.8979200124740601). Low values mean loss of function is poorly tolerated, a safety flag for inhibition.
Who runs trials of these drugs
Principal investigators and study chairs on 14 registry trials, updated in the last three years, of the most advanced drugs against IL17RA (brodalumab), ranked by Phase 2+ trials. Live from ClinicalTrials.gov.
- Elke de JongRadboud University Medical Center · 1 of 1 trials Phase 2+
- Varsha BhattBausch Health Americas, Inc. · 1 of 1 trials Phase 2+
- Jo LambertUniversity Ghent · 0 of 1 trials Phase 2+
- Jordan K KahleUniversity Hospitals Cleveland Medical Center · 0 of 1 trials Phase 2+
- Neil KormanUniversity Hospitals Cleveland Medical Center · 0 of 1 trials Phase 2+
Registry trials of brodalumab updated in the last three years, counted by the country group of their listed sites. A trial with sites in several groups counts in each; 9 of 14 have all sites in one country.
Site counts are not patients per country, and trials registered only outside ClinicalTrials.gov are not covered. Where sites are is a fact about the record, not a judgement of its quality. Europe is the EU and EEA, the UK and Switzerland. Source: ClinicalTrials.gov, fetched live.
16 trials of drugs against IL17RA were stopped early
Terminated, withdrawn and suspended interventional trials of brodalumab, newest update first, live from ClinicalTrials.gov. Each reason is quoted exactly as the registry gives it; we do not sort reasons into safety, efficacy or business. Dates are the last registry update. Showing the 16 most recent of 16.
- terminated · 2025-03-14 · LEO Pharma · Brodalumab“Early terminated due to difficulty recruiting participants”
- terminated · 2025-03-14 · LEO Pharma · Brodalumab“The recruitment was terminated early due to delays and slow recruitment that significantly jeopardized the trial timelines. There were no safety concerns related to the early termination of the trial.”
- terminated · 2022-09-21 · Amgen · Brodalumab“Study terminated early due to lack of efficacy observed following interim analysis in Q2 2015. Study Closed once all sites were closed in eClinical”
- terminated · 2022-02-28 · Amgen · matched by the registry's drug synonyms“Lack of efficacy for Brodalumab in Rheumatoid Arthritis (RA)”
- terminated · 2022-01-03 · Amgen · Brodalumab“The study was terminated early based on an imbalance in worsening Crohn's disease in active treatment groups”
- terminated · 2021-12-28 · Amgen · Brodalumab“The study was terminated early based on an imbalance in worsening Crohn's disease in active treatment groups.”
- withdrawn · 2021-09-30 · Kyowa Kirin Co., Ltd. · matched by the registry's drug synonyms“Due to the reconsideration of KHK4827's business in China, it. was decided to withdraw this clinical trial prior to enrollment of first participant.”
- withdrawn · 2020-09-04 · Rockefeller University · Brodalumab“Biomarker Samples Not Collected”
- terminated · 2020-01-06 · Bausch Health Americas, Inc. · 210 mg brodalumab, 140 mg brodalumab“Sponsor decision”
- terminated · 2020-01-03 · Bausch Health Americas, Inc. · 210 mg brodalumab, 140 mg brodalumab“Sponsor decision”
- terminated · 2020-01-03 · Bausch Health Americas, Inc. · 210 mg brodalumab, 140 mg brodalumab“Sponsor decision”
- terminated · 2019-07-30 · Bausch Health Americas, Inc. · matched by the registry's drug synonyms“Sponsor Decision”
- terminated · 2017-05-19 · Bausch Health Americas, Inc. · 210 mg brodalumab, 140 mg brodalumab“Sponsor Decision”
- terminated · 2016-06-01 · MedDerm Associates · 210mg Brodalumab, 140mg Brodalumab“Sponsor”
- withdrawn · 2015-06-19 · Amgen · Brodalumab 210 mg“Per Amgen's decision to discontinue co-development and co-commercialization of brodalumab, study is being cancelled/closed.”
- withdrawn · 2013-11-25 · Amgen · matched by the registry's drug synonyms“The study had been cancelled and replaced with protocol 20130250.”
Paediatric incentives and obligations for IL17RA's drugs
For brodalumab: what EMA and FDA publish about paediatric plans, orphan status and pediatric approvals, and how many registered studies take children. Each line is a yes, no or not published fact from the record linked under it; none of it is a forecast.
- FDA pediatric target list: no · IL17RA is not on the listRule: Target is on FDA's Pediatric Molecular Target List (relevant targets). Source: FDA Pediatric Molecular Target List (Listed as February 2026 on the FDA Pediatric Oncology page; the file served is 9.7.22_the_relevant_molecular_target_list.xlsx, whose Summary of Changes sheet is headed 'SEPTEMBER 2022 UPDATE' (footnote date 2022-09-01)), 2026-11-11
- EU paediatric investigation plan: yes · EMEA-001089-PIP02-13-M04 (brodalumab, Treatment of psoriasis): PM: decision on the application for modification of an agreed PIP, 14 Jun 2023Rule: An EMA PIP decision (agreement, modification or waiver) lists the drug as its active substance, exact name. Source: EMA EMEA-001089-PIP02-13-M04, 2026-11-11
- EU orphan designation: no · No EU orphan designation names brodalumabRule: An EU orphan designation lists the drug as its active substance (exact name) or belongs to a medicine that does; withdrawn and expired designations are listed with their status. Source: EMA data download (dated snapshot), 2026-11-11
- Authorised in the EU: yes · Kyntheum: authorised since 17 Jul 2017Rule: An EMA medicine record lists the drug as its active substance or INN, exact name; national-only authorisations are not in this file. Source: EMA EPAR Kyntheum, 2026-11-11
- FDA orphan designation: not published · FDA's orphan designation database turns away automated requests, so this app does not read it; search it by hand at the linkRule: Would be: an FDA orphan designation names the drug. Source: FDA orphan designations search
- FDA pediatric oncology approval: no · FDA's table lists no pediatric approval of brodalumabRule: FDA's Pediatric Oncology Drug Approvals table names the drug. Source: FDA Pediatric Oncology Drug Approvals (content current as of 2026-03-03), 2026-11-12
- Registered studies open to children: yes · 5 interventional studies of brodalumab include patients under 18; 1 is recruiting, not yet recruiting or activeRule: The registry's age group includes Child (birth to 17 years), which also counts studies that set no minimum age. Source: ClinicalTrials.gov search, 2026-11-12
Rare pediatric disease voucher. FDA, content current as of 29 Apr 2026: “As of February 3, 2026, enactment of the Consolidated Appropriations Act, 2026, the rare pediatric disease PRV program will sunset after September 30, 2029. FDA may not award any PRVs under this program after September 30, 2029.” Voucher sale prices are not shown here; they appear only as company-reported news. FDA: Rare Pediatric Disease Designation and Priority Review Voucher Programs
All 1 drugs and clinical candidates as a table
Each drug, stage and indication links to its Open Targets record, where the trials and approvals behind it are listed. Salt forms (for example a mesylate) are listed as Open Targets records them, as separate entries.
| Drug | Type | Highest stage | Indications | Source records |
|---|---|---|---|---|
| BRODALUMAB | Antibody | phase 4 | psoriasis vulgaris, psoriasis, pustular psoriasis, psoriatic arthritis, immune system disorder, ankylosing spondylitis, systemic sclerosis, palmoplantar pustulosis, +4 more | Open Targets · ChEMBL |