OnCo

EPHA3 (Ephrin type-A receptor 3) is a protein kinase, an enzyme that switches other proteins on by adding phosphate groups. The public catalogues list it as a drug target, an oncogene driver and a tumour suppressor, and an approved or late-stage drug is recorded against it. Tied to Neuroendocrine tumours, Thyroid cancer, Breast cancer and 5 more. This dossier gathers the 0 products (0 approved), 0 trials, 0 pathways and 0 resistance routes in the corpus that involve it, with external identifiers so it can be joined to UniProt, ChEMBL, Open Targets and the rest of biology.

Biology

Receptor tyrosine kinase which binds promiscuously membrane-bound ephrin family ligands residing on adjacent cells, leading to contact-dependent bidirectional signalling into neighboring cells. The signalling pathway downstream of the receptor is referred to as forward signalling while the signalling pathway downstream of the ephrin ligand is referred to as reverse signalling. Highly promiscuous for ephrin-A ligands it binds preferentially EFNA5. Upon activation by EFNA5 regulates cell-cell adhesion, cytoskeletal organisation and cell migration. Also activated by EFNA1, inhibiting epithelial-to-mesenchymal transition of cardiac cells and playing a role in heart development. Involved in the retinotectal mapping of neurons. Location: Cell membrane; Secreted (UniProt). Locus 3p11.1 (HGNC).

Where it is found
  • Neuroendocrine tumours: Open Targets association 0.62 with neuroendocrine neoplasm (MONDO_0019496)
  • Thyroid cancer: Open Targets association 0.62 with thyroid cancer (MONDO_0002108)
  • Breast cancer: IntOGen driver in 1 cohort (BRCA)
  • Oesophageal cancer: IntOGen driver in 1 cohort (ESCA)
  • Prostate cancer: IntOGen driver in 1 cohort (PRAD)
  • Gastric & gastro-oesophageal junction cancer: IntOGen driver in 1 cohort (STAD)
Class: kinase · Gene: EPHA3 · Facts checked 2026-09-23 · Target page

External identifiers

Built from HGNC, Ensembl, UniProt and ChEMBL ids

Products by modality and phase

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Resistance routes

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Companion diagnostics

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Preclinical models

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Literature

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Query for this target: (TITLE:"EPHA3" OR ABSTRACT:"EPHA3" OR TITLE:"EPH receptor A3" OR ABSTRACT:"EPH receptor A3" OR TITLE:"Ephrin type-A receptor 3" OR ABSTRACT:"Ephrin type-A receptor 3" OR TITLE:"HEK4" OR ABSTRACT:"HEK4" OR TITLE:"ETK1" OR ABSTRACT:"ETK1" OR TITLE:"TYRO4" OR ABSTRACT:"TYRO4") AND (cancer OR tumor OR tumour OR oncology OR carcinoma OR lymphoma OR leukemia OR leukaemia OR myeloma OR sarcoma OR melanoma OR glioma). Results are unfiltered search hits about EPHA3, not a curated reading list.

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The dossier as machine-readable JSON: identifiers from HGNC, Ensembl, UniProt and ChEMBL, products with status, trials, pathways, hotspots, open questions and assays. The full entity record is in the open API at /api/v1/entities/epha3.json. Licence CC BY-NC 4.0.