A method for enhancing efficacy of a monoclonal antibody preparation is provided wherein antigens from patients are tested for their reactivity with said antibody. In accordance with the method of the invention and an amino acid sequence of an expressed protein is deduced from a nucleotide sequence determined by isolation and analysis of a target molecule gene in biopsy from patients and is compared with the previously determined amino acid sequence recognized by said monoclonal antibody preparation to thereby assess fitness of patients for administration of said monoclonal antibody preparation.
