[Immunoscintigraphy of breast cancer xenografts. 99m-Tc-labeled anti-mucin monoclonal antibodies BM-7 and 12H12]. / Immunszintigraphie xenotransplantierter Mammakarzinome. 99mTc-markierte monoklonale Anti-Muzinantikörper BM-7 und 12H12.

The present study was undertaken to evaluate the correlation of the favorable in vitro characteristics of the anti-mucin Mabs 12H12 and BM-7 with high tumor accumulation in vivo. They were labeled with 99mTc; their biodistribution in nude mice bearing mammary tumor xenograft AR was examined and immunoscintigraphy was performed after 24 h. 99mTc-labeling of the Mabs 12H12 and BM-7 led to tumor uptakes of 20.7% and 8.8% ID/g, respectively, after 48 h. Tumor-to-muscle ratios were 31 (12H12) and 18 (BM-7). Tumor xenografts were clearly visualized in immunoscintigrams. Combination of Mab 12H12 and 99mTc provides high tumor-to-tissue ratios shortly after administration.