CD276 and colonic neoplasm: Antibodies used to capture these targeted exosome biomarkers are specific to membrane proteins for: exosomes in general (CD63 and HLA-ABC), exosomes from colon cancer cells (EGFR and STAMP1), lung cancer (SPD, SPA and osteopontin) and tumor-associated exosomes [EpCam, CD276 (B7H3) and 10 other known tumor-associated antigens and cancer-testis antigens].