ANTIMERS AND ANTIMERIC CONJUGATION

There is disclosed an antibody and antibody-drug conjugate for targeting drug delivery as well as a class of chemicals, termed an "antimer." The antimer is designed to "fit" the drug by combining multiple non-covalent interactions between functional groups on the drug and opposing functional groups on the antimer. The net result on the antibody-antimer-drug conjugate is a drug stably bound to the antimer so as not to dissociate during in vivo administration, but not so tightly bound to allow drug dissociation from the conjugate without significant loss of activity and retaining the drug's ability to bind to a higher affinity site on the or within the target cell.