We confirmed a possible interaction between Notch and BCR signaling in B cell malignancies [26] as we observed the upregulation of several genes related to B cell activation (FYN, FGR, NEDD9 and SH2B2) and an increase of cell proliferation after DLL4 stimulation in NOTCH1-mutated MCL cells. The gene discussed is FGR; the disease is mantle cell lymphoma.