EGFR and tarsal-carpal coalition syndrome: Using three EGFR-expressing invasive canine TCC cell lines, K9TCC original (TCC original; minimal EGFR expression), K9TCC-PU AxA (TCC AXA; low EGFR expression) and K9TCC-PU Sh (TCC SH; intermediate EGFR expression), in vitro binding and in vitro NIR-PIT effects were evaluated.