MTA1 and prostate cancer: What about Gnetin C? Gnetin C comparative in vitro experiments with resveratrol and pterostilbene as reference stilbenes showed more potent MTA1 inhibition (in both mRNA and protein levels) and greater MTA1-mediated cytotoxicity in various prostate cancer cells such as DU145, PC3M, 22RV1 and VCAP.