Treatment With Tucatinib in Patients With an Isolated Brain Progression of a Metastatic Breast Cancer

300 mg orally twice daily

Initial loading: 840 mg Maintenance: 420 mg, 3-weekly

"Intravenous formulation :~Initial loading: 8 mg/kg Maintenance: 6 mg/kg, 3-weekly~Subcutaneous formulation:~600 mg (fixed dose regardless of patient's body weight), 3-weekly"

Anastrozole (1 mg/day) or letrozole (2.5 mg/day) or fulvestrant (2x250 mg at day 1 and day 15 then every 4 weeks after the first injection)

"Initial loading:~1200 mg Pertuzumab / 600 mg Trastuzumab (regardless of body weight)~Maintenance:~600 mg Pertuzumab / 600 mg Trastuzumab (regardless of body weight), 3-weekly"