We found that fibroblast growth factor 2 (FGF2) expression is increased in marrow stromal cells during tyrosine kinase inhibitor (TKI) therapy and protects leukemia cells (Ware et al., 2013; Traer et al., 2014; Javidi-Sharifi et al., 2015; Traer et al., 2016). Here, FGF2 is linked to leukemia.