LAUSR

Immunotherapy has an important role in the intervention of breast cancer, but single-agent efficacy of immunotherapy is poor, owing in part to influence of the surrounding tumour microenvironment. Hepatitis A virus cellular receptor-1 (HAVCR1), plays vital roles in immune microenvironment in pancreatic adenocarcinoma, but not clear in breast cancer. The present study aimed to characterize the role of HAVCR1 in immune microenvironment of breast cancer. The Cancer Genome Atlas was used to evaluate functional role of HAVCR1. Kaplan-Meier plotter and Tumor Immune Estimation Resource were applied to illustrate correlation of HAVCR1 with the prognosis and immune infiltration of breast cancer. In Pietenpol subtype, high HAVCR1 levels indicated a favourable overall survival (OS) (HR=0.08, 95%CI:0.01-0.61, P=0.0024) in mesenchymal stem–like breast cancer. However, it was connected to worse OS (HR=2.29, 95%CI:1.04-5.04, P=0.035) in immunomodulatory subtype. Significant correlation was found between HAVCR1 expression level and immune infiltration in breast cancer, especially with B cells, CD8+ T cells, CD4+ T cells, macrophages, neutrophils and Dendritic cell (P<0.05), and other immune markers, such as PDCD1 and CTLA4 (P<0.05). Decreased of HAVCR1 in Mesenchymal stem cells, Natural killer T-cells and enriched of B cell, CD4+ memory T-cells, CD8+ T-cells, Type 1 T-helper cells, Type 2 T-helper cells significantly improved the prediction of OS (P<0.05). Decreased impression of HAVCR1 in B cells and CD8+ T-cells were correlated with worse OS (P<0.05). HAVCR1 is closely correlated with immune microenvironment and may serve as a potential tumour immunotherapy target for breast cancer.