# CCND3

Source: https://onco.cc/targets/ccnd3/  
OnCo record `ccnd3` (Target). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

CCND3 (G1/S-specific cyclin-D3) is a protein that switches other genes on and off. The public catalogues list it as a drug target, an oncogene driver, a tumour suppressor and a biomarker, and clinical evidence ties its variants to diagnosis, prognosis or drug response. Tied to Non-Hodgkin lymphoma, Leukaemia, Breast cancer and 4 more.

## Summary

Regulatory component of the cyclin D3-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. 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. Hypophosphorylates RB1 in early G(1) phase.

CIViC holds 5 clinical evidence items and 0 assertions across 3 variants, naming Palbociclib. Open Targets scores its association with cancer at 0.65 (direct and indirect evidence; datatypes affected pathway 0.61, literature 0.93, genetic association 0.00, somatic mutation 0.97, animal model 0.47). IntOGen calls it a driver in 5 cohorts (3 activating, 2 loss-of-function), covering Burkitt Lymphoma, Diffuse Large B-Cell Lymphoma, NOS, Malignant Lymphoma, Non-Hodgkin Lymphoma.

## Fields

- Kind: Target
- Last checked: 2026-09-23
- Also known as: cyclin D3; G1/S-specific cyclin-D3
- Tags: cancer-genes-wave
- Symbol: CCND3
- Class: transcription
- Biology: Regulatory component of the cyclin D3-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. 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. Hypophosphorylates RB1 in early G(1) phase. Cyclin D-CDK4 complexes are major integrators of various mitogenenic and antimitogenic signals. Component of the ternary complex, cyclin D3/CDK4/CDKN1B, required for nuclear translocation and activity of the cyclin D-CDK4 complex. Shows transcriptional coactivator activity with ATF5 independently of CDK4. Location: Nucleus; Cytoplasm (UniProt). Locus 6p21.1 (HGNC).
- Where found: Non-Hodgkin lymphoma: Open Targets association 0.69 with non-Hodgkin lymphoma (MONDO_0018908); IntOGen driver in 2 cohorts (MLYM, NHL); Leukaemia: Open Targets association 0.54 with leukaemia (MONDO_0005059); Breast cancer: Open Targets association 0.53 with breast cancer (MONDO_0007254); Diffuse large B-cell lymphoma: Open Targets association 0.55 with diffuse large B-cell lymphoma (MONDO_0018905); CIViC evidence names this disease; Non-small-cell lung cancer: CIViC evidence names this disease; Burkitt lymphoma: CIViC evidence names this disease; IntOGen driver in 2 cohorts (BL)

## Notes

- Written by scripts/fetch-cancer-genes.ts from CIViC, Open Targets, IntOGen, HGNC and UniProt; the function text is UniProt's, condensed and in UK spelling. Roles: CIViC lists 1 therapies; IntOGen calls it an activating (Act) driver in 3 cohorts; IntOGen calls it a loss-of-function (LoF) driver in 2 cohorts; CIViC holds 5 clinical evidence items on its variants. Evidence tier "clinical-evidence" is the strongest of those signals.
- Prevalence not recorded: none of the sources gives a positivity rate.
- Diseases the sources name that have no OnCo cancer page yet, so they are not linked: T-cell Lymphoblastic Leukaemia/lymphoma.

## Sources

- HGNC HGNC:1585: https://www.genenames.org/data/gene-symbol-report/#!/hgnc_id/HGNC:1585
- UniProt P30281: https://www.uniprot.org/uniprotkb/P30281/entry
- NCBI Gene 896: https://www.ncbi.nlm.nih.gov/gene/896
- Ensembl ENSG00000112576: https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000112576

## Connected records

- collections: [CIViC](https://onco.cc/collections/civic/), [IntOGen](https://onco.cc/collections/intogen/), [Open Targets Platform](https://onco.cc/collections/open-targets/)
- cancers: [Acute lymphoblastic leukaemia](https://onco.cc/cancers/all-leukemia/), [Breast cancer (all types)](https://onco.cc/cancers/breast-cancer/), [Burkitt lymphoma](https://onco.cc/cancers/burkitt-lymphoma/), [Diffuse large B-cell lymphoma](https://onco.cc/cancers/dlbcl/), [Leukaemia (all types)](https://onco.cc/cancers/leukaemia/), [Non-Hodgkin lymphoma (all types)](https://onco.cc/cancers/non-hodgkin-lymphoma/), [Non-small-cell lung cancer](https://onco.cc/cancers/nsclc/)

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JSON: https://onco.cc/api/v1/entities/ccnd3.json