Co-activation of MET, AXL, ERBB2, and EPHA2 (Figure 4), and co-activation of DDR1 with EGFR (Figure 3B), DDR2, HCK, PDGFRA, and FGR (Figure 6) is evidence that simultaneous activation of multiple tyrosine kinases may be common in lung cancer. This evidence concerns the gene PDGFRA and lung carcinoma.