SLC31A1 expression has a substantial link with tumor purity, and it is markedly positively correlated with infiltrating levels of B lymphocytes, CD8 + T cells, CD4 + T cells, macrophages, neutrophils, and dendritic cells in BC, based on the “Gene of TIMER” module study (Fig. 5D). The gene discussed is SLC31A1; the disease is breast cancer.