FGFR1 and mantle cell lymphoma: Moreover, we also found the expression of KDM2B to be downregulated in shFGFR1 MCL cells (Fig. S4E), and ectopic expression of KDM2B rescued the expression of EZH2 (Fig. S4F), confirming FGFR1 mediated regulation of KDM2B and EZH2 in MCL.