OncoSignal
Live from Open Targets Platform, fetched 2026-11-11 15:30 UTC. Every row links to its source record.

CDK12 cyclin dependent kinase 12

ENSG00000167258 · protein coding · Open Targets profile

Cyclin-dependent kinase that phosphorylates the C-terminal domain (CTD) of the large subunit of RNA polymerase II (POLR2A), thereby acting as a key regulator of transcription elongation. Regulates the expression of genes involved in DNA repair and is required for the maintenance of genomic stability. Preferentially phosphorylates 'Ser-5' in CTD repeats that are already phosphorylated at 'Ser-7', but can also phosphorylate 'Ser-2'. Required for RNA splicing, possibly by phosphorylating SRSF1/SF2. Involved in regulation of MAP kinase activity, possibly leading to affect the response to estrogen inhibitors. {ECO:0000269|PubMed:11683387, ECO:0000269|PubMed:19651820, ECO:0000269|PubMed:20952539, ECO:0000269|PubMed:22012619, ECO:0000269|PubMed:24662513}.

None of the 4 drugs recorded against CDK12 is approved yet

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.

2 small molecule drugs at Phase 2: RONICICLIB, AT-75192 small molecule drugs at Phase 1: AZD-5438, PHA-793887Small molecule 4Phase 2 2Phase 1 2

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 Withdrawn means the drug was pulled from the market or from development.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.

In 15 of 15 cancers, the evidence for CDK12 comes mainly from mutations found in tumours

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.

Inherited (germline) variantsMutations in tumours (somatic)
00.250.50.751prostate adenocarcinomaprostate adenocarcinomaprostate adenocarcinoma: somatic 0.84prostate carcinomaprostate carcinomaprostate carcinoma: somatic 0.61urinary bladder carcinomaurinary bladder carcinomaurinary bladder carcinoma: somatic 0.61colon adenocarcinomacolon adenocarcinomacolon adenocarcinoma: somatic 0.61endometrial endometrioid adenocarcinomaendometrial endometrioid adenocarcinomaendometrial endometrioid adenocarcinoma: somatic 0.61carcinoma of liver and intrahepatic bil…carcinoma of liver and intrahepatic biliary tractcarcinoma of liver and intrahepatic biliary tract: somatic 0.61skin squamous cell carcinomaskin squamous cell carcinomaskin squamous cell carcinoma: somatic 0.61ovarian endometrioid adenocarcinoma wit…ovarian endometrioid adenocarcinoma with squamous differentiationovarian endometrioid adenocarcinoma with squamous differentiation: somatic 0.61conjunctival intraepithelial neoplasmconjunctival intraepithelial neoplasmconjunctival intraepithelial neoplasm: somatic 0.61bile duct carcinomabile duct carcinomabile duct carcinoma: somatic 0.61nodular malignant melanomanodular malignant melanomanodular malignant melanoma: somatic 0.61skin basal cell carcinomaskin basal cell carcinomaskin basal cell carcinoma: somatic 0.61superficial spreading melanomasuperficial spreading melanomasuperficial spreading melanoma: somatic 0.61lung adenocarcinomalung adenocarcinomalung adenocarcinoma: somatic 0.45cervical squamous cell carcinomacervical squamous cell carcinomacervical squamous cell carcinoma: somatic 0.45

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, Structure with Ligand, High-Quality Ligand, Druggable Family
PROTAC
Literature, UniProt Ubiquitination, Database Ubiquitination, Half-life Data, Small Molecule Binder

gnomAD loss of function constraint: o/e 0.12701000273227692 (upper bound 0.19051000475883484). 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 1 registry trials, updated in the last three years, of the most advanced drugs against CDK12 (roniciclib, AT-7519), ranked by Phase 2+ trials. Live from ClinicalTrials.gov.

1 of 1 trials of drugs against CDK12 have sites only in United States

Registry trials of roniciclib, AT-7519 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; 1 of 1 have all sites in one country.

Sites only in this groupSites here and elsewhere
United StatesUnited States: 1 trials with sites only hereUnited States: 0 trials with sites here and elsewhere1

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.

5 trials of drugs against CDK12 were stopped early; 4 give no reason

Terminated, withdrawn and suspended interventional trials of roniciclib, AT-7519, AZD-5438, PHA-793887, 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 5 most recent of 5.

Paediatric incentives and obligations for CDK12's drugs

For roniciclib, AT-7519, AZD-5438, PHA-793887: 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.

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 4 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.

DrugTypeHighest stageIndicationsSource records
RONICICLIBSmall moleculephase 2small cell lung carcinoma, non-small cell lung carcinoma, cancerOpen Targets · ChEMBL
AT-7519Small moleculephase 2mantle cell lymphoma, B-cell chronic lymphocytic leukemia, plasma cell myelomaOpen Targets · ChEMBL
AZD-5438Small moleculephase 1–Open Targets · ChEMBL
PHA-793887Small moleculephase 1–Open Targets · ChEMBL