Abstract
A novel strategy to attach indole‐containing payloads to antibodies through a carbamate moiety and a self‐immolating, disulfide‐based linker is described. This new strategy was employed to connect a selective estrogen receptor down‐regulator (SERD) to various antibodies in a site‐selective manner. The resulting conjugates displayed potent, antigen‐dependent down‐regulation of estrogen receptor levels in MCF7‐neo/HER2 and MCF7‐hB7H4 cells. They also exhibited similar antigen‐dependent modulation of the estrogen receptor in tumors when administered intravenously to mice bearing MCF7‐neo/HER2 tumor xenografts. The indole‐carbamate moiety present in the new linker was stable in whole blood from various species and also exhibited good in vivo stability properties in mice.

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