PMEL premelanosome protein
ENSG00000185664 · protein coding · Open Targets profile
Forms physiological amyloids that play a central role in melanosome morphogenesis and pigmentation. The maturation of unpigmented premelanosomes from stage I to II is marked by assembly of processed amyloidogenic fragments into parallel fibrillar sheets, which elongate the vesicle into a striated ellipsoidal shape. In pigmented stage III and IV melanosomes, the amyloid matrix serves as a platform where eumelanin precursors accumulate at high local concentrations for pigment formation. May prevent pigmentation-associated toxicity by sequestering toxic reaction intermediates of eumelanin biosynthesis pathway. {ECO:0000269|PubMed:11694580, ECO:0000269|PubMed:21962903, ECO:0000269|PubMed:26387950, ECO:0000269|PubMed:26694611, ECO:0000269|PubMed:28272432, ECO:0000269|PubMed:30988362}.
Each band is a group of drugs. It runs from the kind of drug on the left to the furthest stage that drug has reached in any disease on the right. Thicker bands mean more drugs.
Approved bands are highlighted. Withdrawn means the drug was pulled from the market or from development. A combined phase counts as the later one (Phase 1/2 is shown as Phase 2). Hover a band for the drug names. Source: Open Targets Platform, fetched live.
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
- UniProt loc high conf, GO CC high conf, UniProt SigP or TMHMM
- Other modalities
- Approved Drug
gnomAD loss of function constraint: o/e 0.8168399930000305 (upper bound 1.026900053024292). 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 19 registry trials, updated in the last three years, of the most advanced drugs against PMEL (tebentafusp), ranked by Phase 2+ trials. Live from ClinicalTrials.gov.
- Rino SeedorThomas Jefferson University · 2 of 2 trials Phase 2+
- Anthony JoshuaSt Vinents Hospital sydney · 1 of 2 trials Phase 2+
- Jonathan ZagerMoffitt Cancer Center · 1 of 1 trials Phase 2+
- Josep Maria PiulatsInstitut Catala d'Oncologia (ICO) Hospitalet · 1 of 1 trials Phase 2+
- Lynn FeunUniversity of Miami · 1 of 1 trials Phase 2+
- Mark MiddletonConsultant Medical Oncologist and Professor of Experimental Cancer Medicine · 1 of 1 trials Phase 2+
- Paul NathanMount Vernon Cancer Centre, Northwood, UK · 1 of 1 trials Phase 2+
- Richard D. CarvajalNorthwell Health Cancer Institute, NY, USA · 1 of 1 trials Phase 2+
- Serge LeyvrazCharité Hospital, Berlin, Germany · 1 of 1 trials Phase 2+
- Soo ParkUniversity of California, San Diego · 1 of 1 trials Phase 2+
- Francois-Clement BIDARDInstitut Curie · 0 of 1 trials Phase 2+
Registry trials of tebentafusp 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; 11 of 19 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.
2 trials of drugs against PMEL were stopped early; 1 give no reason
Terminated, withdrawn and suspended interventional trials of tebentafusp, imc-gp100, 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 2 most recent of 2.
- withdrawn · 2026-11-06 · University of California, San Diego · matched by the registry's drug synonyms“Lack of funding”
- withdrawn · 2024-07-24 · Immunocore Ltd · Tebentafusp (IMCgp100)No reason given
Paediatric incentives and obligations for PMEL's drugs
For tebentafusp: 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 · PMEL 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: no · No EMA paediatric investigation plan decision names tebentafuspRule: An EMA PIP decision (agreement, modification or waiver) lists the drug as its active substance, exact name. Source: EMA data download (dated snapshot), 2026-11-11
- EU orphan designation: yes · EU/3/21/2397 positive 19 Feb 2021: Treatment of uveal melanomaRule: 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 EU/3/21/2397, 2026-11-11
- Authorised in the EU: yes · Kimmtrak: authorised since 1 Apr 2022, orphan medicineRule: 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 Kimmtrak, 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 tebentafuspRule: 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: no · No interventional study of tebentafusp includes patients under 18Rule: 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 2 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 |
|---|---|---|---|---|
| TEBENTAFUSP | Protein | approval | gastric cancer, uvea neoplasm, uveal cancer, neoplasm, melanoma, cutaneous melanoma, uveal melanoma, clear cell sarcoma | Open Targets · ChEMBL |
| IMC-GP100 | Unknown | early phase 1 | melanoma | Open Targets · ChEMBL |