ERBB2 and breast cancer: Results of qualitative interviews with patients, supported by interviews with experienced oncologists, indicate that individuals with HR+/HER2- advanced breast cancer experience a myriad of concepts related to both disease and treatment, with fatigue/tiredness, hair loss, general pain, and lump in breast reported most frequently and shortness of breath, fatigue/tiredness, general pain, and vomiting reported as the most bothersome.