Effects of triptolide from Tripterygium wilfordii on ERalpha and p 53 expression in two human breast cancer cell lines - Liu, J; Jiang, Z; Xiao, J; Zhang, Y; Lin, S; Duan, W; Yao, J; Liu, C; Huang, X; Wang, T; Liang, Z; Wang, R; Zhang, S; Zhang, L (Phytomedicine, 2009)