Disclosed are methods for the therapeutic administration of bispecific scFv conjugates as single doses at at least weekly intervals. In certain embodiments the conjugate is MM-111 and is administered at intervals of every two weeks or every three weeks. In other embodiments a single loading dose of MM-111 is administered to a human patient followed at at least weekly intervals by a least a single maintenance dose of MM-111. The loading dose is larger than the maintenance dose.