GZMB and cancer: In addition, in vitro experiments of loss and gain of GrB function performed in CRC (including also CRC patient-derived Cancer Stem Cells), bladder and pancreatic carcinoma cells showed that GrB deficiency was associated to the loss of the EMT phenotype and the inhibition of invasion through matrigel, further supporting a role for GrB in tumor EMT promotion and cancer cell invasion (18, 21).