PTPN9 regulates HER3 phosphorylation during trastuzumab treatment and loss of PTPN9 is a potential biomarker for trastuzumab resistance in HER2 positive breast cancer - Abul Azad; Maryam Arshad; Daniele Generali; Katharina Feldinger; Merel Gijsen; Carla Strina; Mariarosa Cappelletti; Daniele Andreis; Russell Leek; Syed Haider; Pirkko‐Liisa Kellokumpu‐Lehtinen; Ioannis Roxanis; et al. (Cancer Communications)