# CD209

Source: https://onco.cc/targets/cd209/  
OnCo record `cd209` (Target). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

CD209 (CD209 antigen) is a gene that drives cell growth when it is altered. The public catalogues list it as an oncogene driver and a tumour suppressor, and it is called a cancer driver by mutation analysis of patient cohorts. Tied to Breast cancer, Gastric & gastro-oesophageal junction cancer and Non-small-cell lung cancer.

## Summary

Pathogen-recognition receptor expressed on the surface of immature dendritic cells (DCs) and involved in initiation of primary immune response. Thought to mediate the endocytosis of pathogens which are subsequently degraded in lysosomal compartments. The receptor returns to the cell membrane surface and the pathogen-derived antigens are presented to resting T-cells via MHC class II proteins to initiate the adaptive immune response.

IntOGen calls it a driver in 3 cohorts (2 activating, 1 loss-of-function), covering Invasive Breast Carcinoma, Lung Squamous Cell Carcinoma, Stomach Adenocarcinoma.

## Fields

- Kind: Target
- Last checked: 2026-09-23
- Also known as: CD209 molecule; CD209 antigen; DC-SIGN; hDC-SIGN; CDSIGN; DC-SIGN1; CLEC4L
- Tags: cancer-genes-wave
- Symbol: CD209
- Class: oncogene
- Biology: Pathogen-recognition receptor expressed on the surface of immature dendritic cells (DCs) and involved in initiation of primary immune response. Thought to mediate the endocytosis of pathogens which are subsequently degraded in lysosomal compartments. The receptor returns to the cell membrane surface and the pathogen-derived antigens are presented to resting T-cells via MHC class II proteins to initiate the adaptive immune response. On dendritic cells (DCs) it is a high affinity receptor for ICAM2 and ICAM3 by binding to mannose-like carbohydrates. May act as a DC rolling receptor that mediates transendothelial migration of DC presursors from blood to tissues by binding endothelial ICAM2. Forms a first contact between DC and resting T cell, througth ICAM3 binding, facilitating the downstream DC-T cell clustering process and DC-induced proliferation of resting T Cells. Location: Membrane raft; Cell membrane; Secreted (UniProt). Locus 19p13.2 (HGNC).
- Where found: Breast cancer: IntOGen driver in 1 cohort (BRCA); Gastric & gastro-oesophageal junction cancer: IntOGen driver in 1 cohort (STAD); Non-small-cell lung cancer: IntOGen driver in 1 cohort (LUSC)

## 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: IntOGen calls it an activating (Act) driver in 2 cohorts; IntOGen calls it a loss-of-function (LoF) driver in 1 cohort. Evidence tier "cohort-driver" is the strongest of those signals.
- Prevalence not recorded: none of the sources gives a positivity rate.

## Sources

- HGNC HGNC:1641: https://www.genenames.org/data/gene-symbol-report/#!/hgnc_id/HGNC:1641
- UniProt Q9NNX6: https://www.uniprot.org/uniprotkb/Q9NNX6/entry
- NCBI Gene 30835: https://www.ncbi.nlm.nih.gov/gene/30835
- Ensembl ENSG00000090659: https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000090659

## Connected records

- collections: [IntOGen](https://onco.cc/collections/intogen/)
- cancers: [Breast cancer (all types)](https://onco.cc/cancers/breast-cancer/), [Gastric & gastro-oesophageal junction cancer](https://onco.cc/cancers/gastric/), [Non-small-cell lung cancer](https://onco.cc/cancers/nsclc/)

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JSON: https://onco.cc/api/v1/entities/cd209.json