Additionally we decided to analyze nine markers of well-known tumor specificity (ERBB2, ESR1, PGR, PLAT, SCGB2A1, SCGB2A2, SERPINE1, SERPINE2 and TFF1) and six candidate markers for CTC detection that were previously identified by our research group (COL3A1, GHR, CALB1, LPHN1, FN1 and EDNRA) [27]. The gene discussed is SERPINE2; the disease is neoplasm.