https://www.selleckchem.com/products/Estradiol.html Autoimmune hepatitis (AIH), primary biliary cirrhosis (PBC) and primary sclerosing cholangitis (PSC) result from the interaction between genetic and environmental factors, but greatly differ in clinical phenotype and target of autoimmune injury. In AIH the autoimmune damage attacks the hepatocytes, leading to a clinically evident hepatitis. The aim of treatment in AIH is to obtain complete remission and to prevent further progression; the backbone of treatment is immunosuppressive therapy, including steroids, required in the long term for the majority of patients. Unfortunately, there is no curative treatment for AIH, and a significant number of patients eventually progress to end-stage liver including liver transplantation (LT). This article is protected by copyright. All rights reserved.CA9 is a member of the carbonic anhydrases' family, that is often expressed in cancer cells under hypoxic condition. However, the role of CA9 in the molecular mechanisms of tongue squamous cell carcinoma (TSCC) pathogenesis remains unclear. CA9 expression was analysed using the TCGA database, and its influence on survival was performed using Kaplan-Meier, LASSO and COX regression analyses. The correlation between CA9 and immune infiltration was investigated by CIBERSORT and ESTIMATE. Moreover, the relationship between CA9 expression and downstream molecular regulation pathways was analysed by GSEA, GO and WGCNA. CA9 expression correlated with clinical prognosis and tumour grade in TSCC. Moreover, CA9 expression potentially contributes to the regulation of cancer cell differentiation and mediates tumour-associated genes and signalling pathways, including apoptosis, hypoxia, G2M checkpoint, PI3K/AKR/mTOR signalling and TGF-beta signalling pathways. However, the follicular helper T cells, regulatory T cells, immune and stromal scores showed no significance between high and low CA9 expression groups. These findings suggested that CA9