We found that 4′,7-dihydroxyflavylium chloride (P7) and the natural apigeninidin can reduce cell viability, whereas 4′,7-dihydroxyflavylium chloride (P7) and 4′-hydroxy-7-O-β-D-glucopyranosyloxyflavylium chloride (P3) increase the activities of NFkB, CREB, and SOX transcription factors, leading to the upregulation of CDH1 promoter activity in PC-3 prostate cancer cells. The gene discussed is CDH1; the disease is prostate carcinoma.