FABP4 and rotator cuff syndrome: In addition to the key adipogenic transcription factors, CCAAT/enhancer-binding protein alpha (C/EBPα) and peroxisome proliferator-activated receptor gamma (PPARγ), the Wnt signaling pathway and fatty acid-binding protein 4 (FABP4) have been suggested to play roles in regulating fatty infiltration following a rotator cuff tear [47,48].