An LUAD patient-derived xenograft (PDX) model (PHLC12) with wild-type and non-amplified epidermal growth factor receptor (EGFR) was tested for response to EGFR tyrosine kinase inhibitors (TKI)….Kinase activity of the BRAF protein isolated from X12CL was inhibited by treatment with the EGFR TKIs gefitinib and osimertinib, and expression of BRAF G469V in non-EGFR-expressing NR6 cells promoted growth in low serum, which was also sensitive to EGFR TKIs.