Focus on HER3 in cancer: Summary
HER3 is a key component of HER2-mediated tumorigenesis
- HER3 is a requirement for HER2 signaling in cancer2
- HER3 enables HER2 signaling by dimerizing with HER2
- Effects of HER2:HER3 signaling include:
- Activation of the PI3K signaling pathway2
- Escape from HER2 inhibition6
HER3 represents a potential therapeutic target
- Methods of targeting could include:
- Targeting HER2:HER3 dimerization22
- Targeting HER3 ligands
- Targeting downstream signaling pathways2
Additional clinical research is needed to better clarify the role of HER3 in cancer.

