Expression of Muc-1 core protein on human MM, breast cancer, and ovarian cancer cell lines. Human MM (ARH-77, OCI My-5, RPMI 8226, and S6B45), breast cancer (MCF.7 and ZR-75), and ovarian cancer (OVC.3 and 36M) cell lines were examined by flow cytometry for cell surface expression of Muc-1 core protein by staining with the VU-4H5 MoAb relative to an isotype control MoAb.