Mice bearing Trop-2+ human gastric carcinoma xenografts (NCI-N87) were given 2 treatments 7 days apart...Animals treated with the ADCs having a DAR of 6.89 had a significantly improved median survival time...These results demonstrate that even in tumors that continued to grow after exposure to SN-38 via a non-specific ADC, a significantly enhanced therapeutic response could be achieved when treated with the Trop-2-specific IMMU-132.