Another possible mode of antiproliferative action of PoPEx could be extrapolated from ellagic acid experiments, which showed that tannins, as selective protein kinase C (PKC) inhibitors, suppress the PKC activity [97] or induce the cyclin-dependent kinase (Cdk) inhibitory protein p21 and G1 arrest in cancer cell lines [98]. Here, PRRT2 is linked to cancer.