Bioespecifica Union refers to a Molecule which comprises a component a and a component dii4 Union Binding to VEGF, where these components comprise a single immunoglobulin variable Domain dii4 binding domain and a simple variable immunoglobulin Binding to VEGF. It also relates to a host cell and a Pharmaceutical composition.These molecules are useful in the treatment of cancerREFERIDA A UNA MOLECULA DE UNION BIOESPECIFICA QUE COMPRENDE UN COMPONENTE DE UNION A DII4 Y UN COMPONENTE DE UNION A VEGF, DONDE DICHOS COMPONENTES COMPRENDEN UN DOMINIO VARIABLE SENCILLO DE INMUNOGLOBULINA DE UNION A DII4 Y UN DOMINIO VARIABLE SENCILLO DE INMUNOGLOBULINA DE UNION A VEGF. TAMBIEN ESTA REFERIDA A UNA CELULA HOSPEDERA Y A UNA COMPOSICION FARMACEUTICA. DICHAS MOLECULAS SON UTILES EN EL TRATAMIENTO DEL CANCER