FLT4 and granular cell tumor: As such, most SEM tissues showed specifically high levels of BTK, CSK, FGFR3, KIT, ABL2, RET, PARP2, RAF1, and PDK1, while non-seminomatous GCT were positive for AURKA / B, FGFR1 / 4, YES1, MET, ERBB2, EGFR, FLT4, PDGFRA / B, AXL, and SRC (Additional file 3: Fig. S3B).