Correlation between the C3AR1 expression in stomach adenocarcinomas and the infiltration degree of immune cells. (A) Expression of C3AR1 was negatively correlated with tumor purity, and positively correlated with CD8+ T cells, monocytes, neutrophils, and dendritic cells. (B) Influence of the infiltration degree of B cells, CD8+T cells, CD4+T cells, macrophages, neutrophils, and dendritic cells on stomach adenocarcinoma prognosis.