Single-agent capecitabine maintenance therapy after response to capecitabine-based combination chemotherapy in patients with metastatic breast cancer

摘要

We performed an analysis of the efficacy of capecitabine monotherapy as maintenance treatment for metastatic breast cancer (MBC) after response to capecitabine-based chemotherapy [capecitabine plus docetaxel (XT) or vinorelbine (XN)] as a first-line or a second-line treatment. Sixty-four Chinese patients with histologically confirmed MBC received capecitabine maintenance therapy after disease stabilization or maximal response to capecitabine-based combination chemotherapy. Single-agent capecitabine was administered at a dose of 1000 mg/m twice daily for 14 days, followed by a 7-day rest period, every 3 weeks. The median time to progression, the primary endpoint of the study, was 4.4 months (95% confidence interval, 3.4-5.4 months). Fifty-nine patients were evaluable for response. Capecitabine maintenance therapy produced an objective response rate of 5.1% (95% confidence interval, 3.9-6.3%). The incidence of grade 3/4 leukopenia (3.1%) and neutropenia (4.7%) was significantly lower (P<0.001) with capecitabine monotherapy than with combination chemotherapy (46.9 and 54.7%, respectively). Conversely, the incidence of grade 3 hand-foot syndrome was higher with capecitabine maintenance therapy than with combination therapy (14.1 vs. 0%, respectively; P=0.003). Capecitabine monotherapy is an effective maintenance treatment after response to capecitabine-based combination chemotherapy in MBC with a favorable safety profile.