Relative mRNA expression levels of IL-6R, STAT3, PD-L1 and VEGF-A. The expression levels of IL-6R, STAT3, PD-L1 and VEGF-A were evaluated in CT-26 cell line treated by 25 μg/ml of TEX or TEX-miR-34a transfection following 24 h. Amplification of PCR was normalized against 60S ribosomal protein L13 RNA (*P < 0.05, ** P < 0.01). IL-6R: Interleukin 6 receptor, STAT3: Signal transducer and activator of transcription 3, PD-L1: Programmed death-ligand 1, VEGF-A: Vascular endothelial growth factor-A