Ascofuranone suppresses PMA-mediated matrix metalloproteinase-9 gene activation through the Ras/Raf/MEK/ERK- and Ap1-dependent mechanisms - Cho, H J; Kang, J H; Kwak, J Y; Lee, T S; Lee, I S; Park, N G; Nakajima, H; Magae, J; Chang, Y C (Carcinogenesis, 2007)