KITLG and oral mucositis: TECs express receptors (FGFR2IIB), for KGF and upon KGF treatment organization of the cortex and medulla was restored in mice.[3, 153] However, its efficacy in humans is questionable as oral mucositis patients receiving KGF failed to increase thymic function.[154] Other biological factors, such as stem cell factor (SCF) and the FMS‐like tyrosine kinase 3 ligand (FLT3LG), act on the hematopoietic compartment to increase thymopoesis.[155]