Methods of isolating, enriching, capturing, identifying, or detecting the presence of, cancerous cells in a sample, e.g., a blood sample from a subject, by detecting the presence of one or more cancer cell surface markers selected from the group consisting of cadherin 1 (CDH1), CDH2, CDH3, CDH4, CDH5, CDH9, CDH11, CDH17, CDH19, protocadherin 9 (PCDH9) and/or PCDH beta 13 (PCDHb13), and optionally an additional cancer cell surface marker, e.g., EpCAM, MUC1, EphB4, EGFR, CEA, and/or HER2.