First safety results of an international phase II study evaluating oral vinorelbine as a single agent as first-line chemotherapy for metastatic breast cancer patients with bone metastases (NorBreast-228 trial).

1048 Background: Oral chemotherapy (CT) is an attractive treatment option for hormone receptor positive, metastatic breast cancer (MBC) patients (pts) pretreated by a hormone therapy. In our phase II study, we evaluated the role of single-agent Oral Vinorelbine (OV) as first-line CT in pts presenting bone metastases without visceral involvement. In this abstract, first safety results of this trial are presented. Methods: Main eligibility criteria included: age ≥18 years, documented bone involvement previously untreated by CT, hormone receptor positive disease previously treated by at least one hormone therapy, HER2-negative disease, Karnofsky PS ≥70 and absence of visceral metastases. Study treatment (until progression): OV 80 mg/m2 weekly (following a first cycle at 60 mg/m2 and dose escalation to 80 in the absence of grade 3 or 4 toxicity). One cycle was defined as four weeks of treatment. Results: Main pts characteristics in the full population were (n=70): median age: 60.6 years (34% ≥65 years); media...