MCM3AP-AS1 overexpression enhances CDDP resistance in GC cells. (A) The overexpression efficiency of MCM3AP-AS1 in NCI-N87/CDDP and AGS/CDDP cells was assessed by reverse transcription-quantitative PCR. (B) Migratory (magnification, ×200) and (C) invasive abilities (magnification, ×200) of CDDP-resistant GC cells was detected after overexpressing MCM3AP-AS1 by wound healing and Transwell assays, respectively. (D) Cell viability of NCI-N87/CDDP and AGS/CDDP cells was measured after overexpressing MCM3AP-AS1 by Cell Counting Kit-8 assay. (E) The IC50 of NCI-N87/CDDP and AGS/CDDP cells was tested after overexpressing MCM3AP-AS1 by drug-sensitivity assay. *P<0.05 vs. pcDNA3.1. MCM3AP-AS1, MCM3AP antisense RNA 1; CDDP, cisplatin; GC, gastric cancer; OD, optical density.