The humanized antibody Rebmab200 and its murine origin MX35 completely co-typed by FACS and no binding differences were observed, including binding to the known NaPi2b-positive ovarian cancer cell lines OVCAR-3 and SK-OV-6, the renal cancer cell line SK-RC-18 and the lung cancer cell line SK-LC-1. This evidence concerns the gene SLC34A2 and ovarian carcinoma.