APOD and cancer: The intersection of the secretome databases CBS Servers, Vesiclepedia, Human Cancer Secretome Database, and Plasma Proteome Database showed seven overlapping proteins: IL-8, Secretogranin II (SCG2), Neural Cell Adhesion Molecule 1 (NCAM1), Contactin 1 (CNTN1), Cell Adhesion Molecule 1 (CADM1), Neuronal pentraxin 1 (NPTX1), and Apolipoprotein D (APOD) (Figure 4a).