RGX-019-MMAE induced cytotoxicity in MERTK-expressing cancer cells and in xenografts, RGX-019-MMAE demonstrated anti-tumor efficacy including complete tumor regressions in various solid cancers such as TNBC as well as AML and MM. Anti-tumor efficacy was associated with increased overall survival...Collectively, RGX-019-MMAE’s robust anti-tumor efficacy in multiple aggressive tumors, and MERTK’s expression profile on cancer cells and normal tissue support further advancement of RGX-019-MMAE as a drug candidate for development in solid and liquid cancers.