The present invention describes a bispecfic antibody composed of the variabledomains (VH and VL) of two antibodies,hERG1 mAb (which binds the extracellular domain S5-P of hERG1) and of (.beta.1integrin mAb TS2/16 or BV7, which bind the extracellulardomain of (.beta.1 integrin. The present invention relates also to a novelanti-hERG1 molecule bearing a Cys in position 95 of the VH domain.The invention describes also their application for diagnostic and therapeuticpurposes in oncology and other fields of medical sciences.