A, Schematic depicting experimental setup used for B-D. B-D, Immunoblots were performed using protein lysates from MCF7 cells plated onto ECM scaffolds (ECM) or uncoated surfaces with conditioned complete culture media from cancer cells (B), conditioned complete culture media from fibroblasts (C), or with disrupted decellularized ECM (D). Total Erk, phosphorylated Erk, AREG, TFF1, β-actin, and ER protein expression was detected.