Ursolic acid inhibits nuclear factor-κB activation induced by carcinogenic agents through suppression of IκBα kinase and p65 phosphorylation: correlation with down-regulation of cyclooxygenase 2, matrix metalloproteinase 9, and cyclin D1 - Shishodia, S; Majumdar, S; Banerjee, S; Aggarwal, B B (Cancer Res, 2003)