We used the TIMER database to study the correlation between SIRT7 and various immunocytochemical markers of immune cells (CD8+ T cells, T cells, B cells, monocytes, TAMs, M1 and M2 macrophages, neutrophils, natural killer cells, and dendritic cells) in different breast cancer subtypes (luminal, basal, and HER2+). This evidence concerns the gene ERBB2 and breast cancer.