TAP1 and hepatocellular carcinoma: A specific Gli inhibitor GANT-61 significantly suppressed HH signaling to reverse sorafenib resistance in CD44-positive HCC, suggesting HH signaling pathway can influence HCC drug resistance.273 Further experiments by Zhou et al. confirmed that Gli1/2 binds to the promoter of transporter associated with antigen processing 1 (TAP1) gene, indicating that TAP1 is one of target genes of HH signaling pathway in HCC cell lines.