Sunitinib in combination with trastuzumab for the treatment of advanced breast cancer: activity and safety results from a phase II study

Thomas Bachelot, Jose A Garcia-Saenz, Sunil Verma, Maya Gutierrez, Xavier Pivot, Mark F Kozloff, Catherine Prady, Xin Huang, Reza Khosravan, Zhixiao Wang, Rossano Cesari, Vanessa Tassell, Kenneth A Kern, Jean-Yves Blay, Ana Lluch, Thomas Bachelot, Jose A Garcia-Saenz, Sunil Verma, Maya Gutierrez, Xavier Pivot, Mark F Kozloff, Catherine Prady, Xin Huang, Reza Khosravan, Zhixiao Wang, Rossano Cesari, Vanessa Tassell, Kenneth A Kern, Jean-Yves Blay, Ana Lluch

Abstract

Background: This phase II study evaluated the efficacy and safety/tolerability of sunitinib plus trastuzumab in patients with HER2-positive advanced breast cancer (ABC).

Methods: Eligible patients received sunitinib 37.5 mg/day and trastuzumab administered either weekly (loading, 4 mg/kg; then weekly 2 mg/kg) or 3-weekly (loading, 8 mg/kg; then 3-weekly 6 mg/kg). Prior trastuzumab and/or lapatinib treatment were permitted. The primary endpoint was objective response rate (ORR).

Results: Sixty patients were enrolled and evaluable for safety; 57 were evaluable for efficacy. The majority of patients (58%) had received no prior chemotherapy in the metastatic setting. The ORR was 37%; the clinical benefit rate (CBR; percent objective response plus stable disease ≥ 24 weeks) was 56%. Among patients who were treatment-naïve or had received only adjuvant therapy, the ORR was 44% and the CBR was 59%. Overall, median overall survival had not been reached and the 1-year survival rate was 91%. The majority of adverse events (AEs) were mild to moderate in severity. Forty percent of patients experienced AEs related to measured left ventricular ejection fraction (LVEF) declines, which occurred more frequently in patients who had received prior anthracycline treatment. Ten percent of patients exhibited symptoms related to LVEF declines. One patient died on study from cardiogenic shock. Antitumor response and several safety parameters appeared to correlate with sunitinib exposure.

Conclusions: Sunitinib plus trastuzumab demonstrated antitumor activity in patients with HER2-positive ABC, particularly those who were treatment-naïve or had only received prior adjuvant treatment. Sunitinib plus trastuzumab had acceptable safety and tolerability in patients with HER2-positive ABC who had not received prior anthracycline therapy.

Trial registration: NCT00243503.

Figures

Figure 1
Figure 1
Antitumor activity of sunitinib plus trastuzumab. (A) Maximum reduction in target lesion size by patient, with confirmed responses based on RECIST indicated. Broken gray lines indicate cut-offs for progressive disease and partial responses. (B) and (C) Kaplan–Meier estimates of (B) progression-free survival and (C) overall survival. RECIST, Response Evaluation Criteria in Solid Tumors.

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