The present invention relates to a bispecific single chain antibody molecule comprising a first binding domain capable of binding to an epitope of human and non-chimpanzee primate CD3 epsilon chain, wherein the epitope is part of an amino acid sequence comprised in the group consisting of SEQ ID NOs. 2, 4, 6, and 8, and a second binding domain capable of binding to prostate-specific membrane antigen (PSMA). The invention also provides nucleic acids encoding said bispecific single chain antibody molecule as well as vectors and host cells and a process for its production. The invention further relates to pharmaceutical compositions comprising said bispecific single chain antibody molecule and medical uses of said bispecific single chain antibody molecule.Molekul bispecifičnog jednolančanog antitela koji sadži prvi vezujući domen koji se specifično vezuje za cpitop humanog i Callithrix jacchus, Saguinus oedipus ili Saimiri sciureus CD3ε (epsilon) lanac, gde je pomenuti epitop deo aminokiselinske sekvence sadržane u grupi koja se sastoji od SEQ ID NOs. 2, 4, 6, ili 8, i sadrži najmanje aminokiselinsku sekvencu Gln-Asp-Glv-Asn-Glu, i drugi vezujući domen koji se vezuje za antigen specifičan za membranu prostate (PSMA).Prijava sadrži još 17 patentnih zahteva.
