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Comparative effectiveness of early-line nab-paclitaxel (nab-P) versus eribulin in patients (pts) with metastatic breast cancer (MBC): A U.S. real-world analysis.

293 Background: In a phase III study in MBC, nab-P demonstrated anti-tumor activity across lines of therapy. Eribulin is indicated for the treatment (Tx) of MBC in pts who have previously received ≥ 2 chemotherapeutic regimens. This analysis evaluated Tx patterns and effectiveness of nab-P and eribulin in pts with MBC in a real-world community-based setting.

METHODS: A retrospective cohort study was performed using fully de-identified data from a US electronic medical record platform of 1300 community oncology physicians. The analysis included women aged ≥ 18 years with MBC who started on nab-P or eribulin monotherapy as 1L or 2L Tx from 12/4/10 to 10/6/14 (≥ 1 cycle of nab-P or eribulin required). The primary objective was to examine duration of Tx (DOT, including time to Tx discontinuation [TTD]; censored if last administration > 30 days from the last date in the database) and time to next Tx (TTNT; day 1 from drug 1 to drug 2). Incidence of adverse events (AEs) and supportive care used during Tx were also examined.

RESULTS: Pt characteristics were similar between groups. Mean age was 59 years. Most pts had hormone receptor + (62%), HER2- (82%) disease, and 1L therapy (60%). More pts received nab-P vs eribulin. Slightly more pts receiving nab-P vs eribulin were treated in 1L (63% vs 55%). DOT, TTNT, and TTD were significantly longer in the nab-P vs eribulin group (Table). Thrombocytopenia and anemia were numerically lower in the nab-P vs eribulin group (P = 0.11 for each). Nausea/vomiting was less common with eribulin vs nab-P (P = 0.009). Granulocyte-colony stimulating factor, hydrating agents, and antiemetics were used less often in pts receiving nab-P (P < 0.01 for each).

CONCLUSIONS: DOT, TTNT, and TTD were significantly longer for pts treated with nab-P vs eribulin. Moreover, pts receiving nab-P experienced fewer hematologic AEs and utilized fewer doses of supportive care. [Table: see text].

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