S100A4 and neoplasm: KSX-476 and KSX-488 expressed tumor associated fibroblast (TAF) markers including platelet derived growth factor receptors (PDGFR)-α and -β, α-smooth muscle actin (α-SMA), fibroblast activation protein (FAP) and S100A4 (72–74), with some variance noted between the two cell cultures (Fig. 7B).