Collecting together (Figure S2) the three levels of protein intersection (GPR19-BRCA1 and metabolism–18 proteins; GPR19-ATM and metabolism–9 proteins; and GPR19-CHEK2 and metabolism–9 proteins) created a functional STRING (https://string-db.org/: accessed on 21 February 2023) interaction network (Figure 3D) strongly associated with cancer physiology (Figure 3E), i.e., the most enriched (FDR 1.03 × 10−10) associated PubMed Reference text was “Oncogene-Driven Metabolic Alterations in Cancer” [49] (Figure 3F). Here, CHEK2 is linked to cancer.