GZMB and colorectal carcinoma: A band at ∼ 35 kDa corresponding to GrB was found by Western blotting (WB) in 4 (HT-29, Caco-2, HCT 116 and HCT-8) out of 7 (57.1 %) CRC cells (Fig. 1a, upper panel) and in 4 out of 4 (100 %) CSCs (Fig. 1b, right panel).