CCND1 cyclin D1
ENSG00000110092 · protein coding · Open Targets profile
Regulatory component of the cyclin D1-CDK4 (DC) complex that phosphorylates and inhibits members of the retinoblastoma (RB) protein family including RB1 and regulates the cell-cycle during G(1)/S transition (PubMed:1827756, PubMed:1833066, PubMed:19412162, PubMed:33854235, PubMed:8114739, PubMed:8302605). Phosphorylation of RB1 allows dissociation of the transcription factor E2F from the RB/E2F complex and the subsequent transcription of E2F target genes which are responsible for the progression through the G(1) phase (PubMed:1827756, PubMed:1833066, PubMed:19412162, PubMed:8114739, PubMed:8302605). Hypophosphorylates RB1 in early G(1) phase (PubMed:1827756, PubMed:1833066, PubMed:19412162, PubMed:8114739, PubMed:8302605). Cyclin D-CDK4 complexes are major integrators of various mitogenenic and antimitogenic signals (PubMed:1827756, PubMed:1833066, PubMed:19412162, PubMed:8302605). Also a substrate for SMAD3, phosphorylating SMAD3 in a cell-cycle-dependent manner and repressing its transcriptional activity (PubMed:15241418). Component of the ternary complex, cyclin D1/CDK4/CDKN1B, required for nuclear translocation and activity of the cyclin D-CDK4 complex (PubMed:9106657). Exhibits transcriptional corepressor activity with INSM1 on the NEUROD1 and INS promoters in a cell cycle-independent manner (PubMed:16569215, PubMed:18417529). {ECO:0000269|PubMed:15241418, ECO:0000269|PubMed:16569215, ECO:0000269|PubMed:1827756, ECO:0000269|PubMed:1833066, ECO:0000269|PubMed:18417529, ECO:0000269|PubMed:19412162, ECO:0000269|PubMed:33854235, ECO:0000269|PubMed:8114739, ECO:0000269|PubMed:8302605, ECO:0000269|PubMed:9106657}.
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 Withdrawn means the drug was pulled from the market or from development.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
- Small molecule
- Advanced Clinical, High-Quality Ligand, Druggable Family
- PROTAC
- UniProt Ubiquitination, Database Ubiquitination, Small Molecule Binder
gnomAD loss of function constraint: o/e 0.3452700078487396 (upper bound 0.6025000214576721). 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 241 registry trials, updated in the last three years, of the most advanced drugs against CCND1 (palbociclib), ranked by Phase 2+ trials. Live from ClinicalTrials.gov.
- François-Clément BIDARDInstitut Curie (France) · 2 of 3 trials Phase 2+
- Angela DeMicheleUniversity of Pennsylvania · 2 of 2 trials Phase 2+
- Antoine ItalianoInstitut Bergonié · 2 of 2 trials Phase 2+
- Cynthia X MaWashington University School of Medicine · 2 of 2 trials Phase 2+
- Douglas AdkinsWashington University School of Medicine · 2 of 2 trials Phase 2+
- Erica MayerDana-Farber Cancer Institute · 2 of 2 trials Phase 2+
- Evanthia GalanisAlliance Foundation Trials, LLC. · 2 of 2 trials Phase 2+
- Jessica TaoJohns Hopkins University · 2 of 2 trials Phase 2+
- Jin ZhouWest China Hospital · 2 of 2 trials Phase 2+
- Sibylle LoiblGerman Breast Group - GBG Forschungs GmbH · 2 of 2 trials Phase 2+
- zhiming shaoFudan University · 2 of 2 trials Phase 2+
- Alicia OkinesThe Royal Marsden Hospital · 1 of 2 trials Phase 2+
- Miguel Ángel Quintela-FandinoCentro Nacional de Investigaciones Oncológicas · 1 of 2 trials Phase 2+
- Nicholas TurnerRoyal Marsden NHS Foundation Trust · 1 of 2 trials Phase 2+
- Richard BairdCambridge University Hospitals · 1 of 2 trials Phase 2+
Registry trials of palbociclib 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; 151 of 224 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. 17 trials list no sites and are left out. Source: ClinicalTrials.gov, fetched live.
47 trials of drugs against CCND1 were stopped early; 2 give no reason
Terminated, withdrawn and suspended interventional trials of palbociclib, briciclib, 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 25 most recent of 47.
- terminated · 2026-09-24 · Tvardi Therapeutics, Incorporated · Palbociclib“The study was terminated prior to Phase 2 due to slow accrual.”
- terminated · 2026-07-22 · M.D. Anderson Cancer Center · Palbociclib“<75% participation”
- terminated · 2026-06-25 · SOLTI Breast Cancer Research Group · Palbociclib + Letrozole OR Fulvestrant“The study was prematurely halted because enrollment was significantly delayed compared with the original projections due to the evolving therapeutic landscape.”
- suspended · 2026-02-13 · Dana-Farber Cancer Institute · Palbociclib“Funding and drug supply to continue the study are pending.”
- terminated · 2025-11-24 · Sanofi · Palbociclib“Sponsor decision to prematurely stop the study, not linked to any safety concern.”
- terminated · 2025-11-12 · NiKang Therapeutics, Inc. · palbociclib“This study was terminated as a result of Sponsor portfolio reprioritization.”
- terminated · 2025-09-26 · Georgetown University · Palbociclib“lack of accrual”
- terminated · 2025-09-11 · Sanofi · Palbociclib“The study was terminated based on the review by an independent data monitoring committee of the prespecified interim analysis of the Phase 3 AMEERA-5 efficacy data. No new safety signals were observed.”
- terminated · 2024-12-27 · M.D. Anderson Cancer Center · Palbociclib“Despite modifications, accrual was poor and the closed”
- terminated · 2024-11-08 · Hoffmann-La Roche · Palbociclib“The decision to not open the Phase III portion was based on a strategic sponsor decision and not driven by any safety concerns.”
- withdrawn · 2024-09-19 · Brown University · Palbociclib Oral Product“Lack of accrual”
- terminated · 2024-09-03 · Pfizer · PF-06804103 + Palbociclib +Letrozole“The trial was terminated based on the stage in drug development and assessment of PF-06804103 relative to the leading external competition. The decision was not due to a safety concern.”
- suspended · 2024-08-19 · Ascentage Pharma Group Inc. · Palbociclib“Company Decision”
- terminated · 2024-08-01 · Dana-Farber Cancer Institute · Palbociclib“The study closed early due to discontinuation of ganitumab supply.”
- terminated · 2024-03-08 · Theodoros Foukakis · Palbociclib“Slow accrual”
- terminated · 2024-03-05 · University of Kansas Medical Center · Palbociclib 75mg, Palbociclib 100mg, Palbociclib 125mg, Palbociclib“Low accrual”
- terminated · 2024-03-04 · OHSU Knight Cancer Institute · Palbociclib“Low accrual”
- terminated · 2024-02-26 · Veru Inc. · matched by the registry's drug synonyms“Business decision”
- withdrawn · 2024-02-02 · University of Michigan Rogel Cancer Center · Palbociclib 125Mg Tab“funding was not secured”
- withdrawn · 2024-01-23 · OHSU Knight Cancer Institute · Palbociclib“Withdrawn due to a change in therapeutic interventions.”
- withdrawn · 2023-12-22 · Roswell Park Cancer Institute · Palbociclib“Issues recruiting”
- terminated · 2023-12-18 · Worldwide Innovative Network Association · Palbociclib“The SPRING trial had to be early terminated at the end of the Phase 1 portion of the study due to the absence of funding necessary for the performance of the Phase 2.”
- withdrawn · 2023-09-07 · Bradley A. McGregor, MD · Palbociclib“The overall protocol will be changed in a new amendment, which will be resubmitted under the new IND.”
- terminated · 2023-05-10 · Peter MacCallum Cancer Centre, Australia · Palbociclib“low recruitment”
- withdrawn · 2023-04-28 · Memorial Sloan Kettering Cancer Center · Palbociclib“The sponsor closed the study due to discontinuing their onapristone program”
Paediatric incentives and obligations for CCND1's drugs
For palbociclib, briciclib: 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: yes · CCND1 is on the list. Membership alone neither requires nor waives a pediatric study.Rule: 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-002146-PIP01-17-M04 (Palbociclib, Treatment of Ewing sarcoma): PM: decision on the application for modification of an agreed PIP, 13 Apr 2022; EMEA-002146-PIP02-18 (Palbociclib, Treatment of breast malignant neoplasms): W: decision granting a waiver in all age groups for all conditions or indications, 3 Jan 2019Rule: 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: no · No EU orphan designation names palbociclib, briciclibRule: 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 · Palbociclib Viatris: authorised since 19 Jun 2026; Ibrance: authorised since 9 Nov 2016Rule: 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 data download (dated snapshot), 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 palbociclib, briciclibRule: FDA's Pediatric Oncology Drug Approvals table names the drug. Source: FDA Pediatric Oncology Drug Approvals (content current as of 2026-03-03), 2026-11-11
- Registered studies open to children: yes · 16 interventional studies of palbociclib, briciclib include patients under 18; 6 are 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, 2026-11-11
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 |
|---|---|---|---|---|
| PALBOCICLIB | Small molecule | phase 4 | breast cancer, breast carcinoma, breast neoplasm, neoplasm, cancer, soft tissue sarcoma, head and neck squamous cell carcinoma, estrogen-receptor positive breast cancer, +88 more | Open Targets · ChEMBL |
| BRICICLIB | Small molecule | phase 1 | – | Open Targets · ChEMBL |