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Relative cell viability rate of PLAC8-overexpressing PC-9 cells treated with gefitinib and U0126. CCK-8 assays were used to detect the proliferation of OENC and PLAC8-overexpressing cells treated with DMSO (control treatment group) or with the gefitinib alone or in combination with ERK inhibitor, U0126. NS, non-significant; PLAC8, placenta-specific protein 8; OENC, overexpression negative control. *P<0.05 and **P<0.01.
