Extended adjuvant treatment of patients with HER2+ early breast cancer with neratinib: a multi-centric, prospective, non-interventional study (NIS) in Germany and Austria (ELEANOR) - R. Bartsch; D. Lüftner; M. Balic; G. Rinnerthaler; C. Jackisch; V. Müller; M. Schmidt; N. Harbeck (Breast, 2021)