STAT3 and hepatocellular carcinoma: MIAT and PD-L1 are upregulated in HCC; MIAT promotes STAT3 by inhibiting miR-411-5p, increasing PD-L1 transcription. MIAT knockdown enhances T cell cytotoxicity, while miR-411-5p inhibition reverses STAT3 and PD-L1 reduction.