Curcumin potentiates antitumor activity of gemcitabine in an orthotopic model of pancreatic cancer through suppression of proliferation, angiogenesis, and inhibition of nuclear factor-kappaB-regulated gene products - Kunnumakkara, A B; Guha, S; Krishnan, S; Diagaradjane, P; Gelovani, J; Aggarwal, B B (Cancer Res, 2007)