Candidate cell surface proteins, including c-Met, CD44v6, E-cadherin, EGFR, EMMPRIN and EpCAM, were identified based by a literature survey focusing on the percentage of positive tumors, the homogeneity of expression within the same tumor and whether the protein was expressed on the epithelium or the tumor stroma (Suppl. The gene discussed is EPCAM; the disease is neoplasm.