The present invention relates to a humanised sequence binding the
receptor tyrosine kinase ErbB3 / HER3 for the generation of anti-
ErbB3 / HER3 antibodies in different formats, such as, for example, immunoglobulins, bispecific antibodies, in particular bispecific T-
cell engagers, or
antibody-
drug conjugates (ADCs) or fusion immunoproteins, for the treatment of
solid tumours depending on the expression of the
ErbB3
receptor.