To further evaluate whether overexpression of AXL increased HER3 phosphorylation in HNSCC cells, we overexpressed AXL in the cetuximab-sensitive cell lines HN30 (HN30-AXL) and PCI37A (PCI37A-AXL) via stable transfection. This evidence concerns the gene ERBB3 and head and neck squamous cell carcinoma.