DPP4 and Nephroblastoma: Fascial fibroblasts resemble features of fibroblasts derived from hypertrophic scars and keloids, including high expression of NOV (nephroblastoma overexpressed, or CCN3), CD26 (DPP4), and FAP (fibroblast activating protein) [23] to produce more of the proteoglycan versican [80] but less collagenase (MMP1) [81].