FABP4 and urothelial carcinoma: Indeed, recent studies have demonstrated a wider expression of FABP4 in an array of cells and tissues, including macrophages upon their differentiation from monocytes, human bronchial epithelial cells, arterial endothelial cells, trophoblasts, liver, skeletal muscle fibres, lipoblastoma and liposarcoma, and human urothelial carcinomas (Shum et al. 2006; Biron-Shental et al. 2007; Lee et al. 2007; Ferrell et al. 2008; Boiteux et al. 2009; Elmasri et al. 2009; Scifres et al. 2011).