Analysis of the TCGA-BRCA (The Cancer Genome Atlas-breast invasive carcinoma) database on the GDC (Genomic Data Commons) data portal of the National Cancer Institute consisting of 110 matched patients (n = 110) showed that there was no difference in mRNA expression of either FPN (Figure 1f) or Lcn-2 (Figure 1g) in breast cancer tissue compared to healthy breast tissue. Here, SLC40A1 is linked to breast cancer.