Abstract: The present invention refers to a method of treating tumor growth and metastasis in a mammal, the treating comprising administering allogeneic effector cells together with trifunctional bispecific or trispecific antibodies or a combination thereof having the following properties: a) binding to a T cell b) binding to at least one antigen on a tumor cell c) binding via their Fc portion in the case of trifunctional bispecific antibodies or via third specificity in the case of trispecific antibodies to Fc receptor positive cells; the antibodies redirecting the allogenic cells away from host tissues in order to substantially reduce or avoid a graft versus host disease.

Abstract: The present invention refers to a method of treating tumor growth and metastasis in a mammal, said treating comprising administering allogenic effector cells together with trifunctional bispecific or trispecific antibodies or a combination thereof having the following properties: a) binding to a T cell b) binding to at least one antigen on a tumor cell c) binding via their Fc portion in the case of trifunctional bispecific antibodies or via third specificity in the case of trispecific antibodies to Fc receptor positive cells said antibodies redirecting the allogenic cells away from host tissues in order to substantially reduce or avoid a graft versus host disease.

Abstract: A method of inducing immune tolerance in a first mammal to antigens of a second, non-syngeneic, mammal, is disclosed. The method is utilized to minimize graft rejection and/or reduce graft-versus-host diseases in transplantation procedures and to produce hematopoietic mixed chimeras. Methods of determining the activity of tyrphostins and the optimal concentration thereof in this method are also disclosed.