miR-103a-3p expression levels are increased in patients with cisplatin-resistant NSCLC. The level of miR-103a-3p was significantly increased in (A) the serum and (B) the tumors of patients with NSCLC that acquired resistance to cisplatin treatment compared with cisplatin-sensitive patients. (C) The level of miR-103a-3p was significantly increased in the cisplatin resistant cell line, A549/cisplatin, compared with the cisplatin-sensitive cell line, A549. (D) The level of miR-103a-3p was significantly increased in cisplatin resistant cell line, PC-9/cisplatin, compared with the cisplatin-sensitive cell line, PC-9. The levels of miR-103a-3p were assessed using reverse transcription-quantitative PCR. *P<0.05 and **P<0.01 with comparisons indicated by lines. miR, microRNA; NSCLC, non-small cell lung carcinoma; cDDP, cisplatin.