Effects of PGE2, PGE3, and 17-HDHA on HER2, HER3, and c-Myc expression in E0771 cells. After treatment of E0771 cells with PGE2 (1 μM), PGE3 (1 μM), 17-HDHA (1 μM), or DMSO as control, cells were harvested, and Western blotting was performed to detect HER2, HER3, c-Myc, and β-actin expression.