A phase 3 tRial comparing capecitabinE in combination with SorafenIb or pLacebo for treatment of locally advanced or metastatIc HER2-Negative breast CancEr (the RESILIENCE study): study protocol for a randomized controlled trial

José Baselga, Frederico Costa, Henry Gomez, Clifford A Hudis, Bernardo Rapoport, Henri Roche, Lee S Schwartzberg, Oana Petrenciuc, Minghua Shan, William J Gradishar, José Baselga, Frederico Costa, Henry Gomez, Clifford A Hudis, Bernardo Rapoport, Henri Roche, Lee S Schwartzberg, Oana Petrenciuc, Minghua Shan, William J Gradishar

Abstract

Background: Sorafenib is an oral multikinase inhibitor with antiangiogenic/antiproliferative activity. A randomized phase 2b screening trial in human epidermal growth factor receptor 2 (HER2)-negative advanced breast cancer demonstrated a significant improvement in progression-free survival (PFS) when sorafenib was added to capecitabine versus placebo (median 6.4 versus 4.1 months; hazard ratio = 0.58; P = 0.001). Most drug-related adverse events were Grade 1/2 in severity with the exception of Grade 3 hand-foot skin reaction/syndrome (44% versus 14%, respectively). These results suggest a role for the combination of sorafenib and capecitabine in breast cancer and supported a phase 3 confirmatory trial. Here we describe RESILIENCE - a multinational, double-blind, randomized, placebo-controlled, phase 3 trial - assessing the addition of sorafenib to first- or second-line capecitabine in advanced HER2-negative breast cancer.

Methods/design: Eligibility criteria include ≥18 years of age, ≤1 prior chemotherapy regimen for metastatic disease, and resistant to/failed taxane and anthracycline or no indication for further anthracycline. Prior treatment with a vascular endothelial growth factor inhibitor is not allowed. Patients with significant cardiovascular disease or active brain metastases are not eligible. Patients are stratified by hormone-receptor status, geographic region, and prior metastatic chemotherapy status and randomized (1:1) to capecitabine (1000 mg/m2 orally twice daily (BID), days 1 to 14 of 21) in combination with sorafenib (orally BID, days 1 to 21, total dose 600 mg/day) or matching placebo. Capecitabine and sorafenib/placebo doses can be escalated to 1250 mg/m2 BID and 400 mg BID, respectively, as tolerated, or reduced to manage toxicity. Dose re-escalation after a reduction is allowed for sorafenib/placebo but not for capecitabine. This dosing algorithm was designed to mitigate dermatologic and other toxicity, in addition to detailed guidelines for prophylactic and symptomatic treatment. Radiographic assessment is every 6 weeks for 36 weeks, and every 9 weeks thereafter. The primary endpoint is PFS by blinded independent central review (Response Evaluation Criteria in Solid Tumors 1.1 criteria). Secondary endpoints include overall survival, time to progression, overall response rate, duration of response, and safety. Enrollment began in November 2010 with a target of approximately 519 patients.

Discussion: RESILIENCE will provide definitive PFS data for the combination of sorafenib and capecitabine in advanced HER2-negative breast cancer and better characterize the benefit-to-risk profile.

Trial registration: Clinicaltrials.gov, NCT01234337.

Figures

Figure 1
Figure 1
Study design and treatment schema of RESILIENCE. *If treatment is well tolerated after Cycle 1; †if sorafenib/placebo 400 mg BID is well tolerated. BID, twice daily; DoR, duration of response; MBC, metastatic breast cancer; ORR, overall response rate; OS, overall survival; PFS, progression-free survival; po, oral; R, randomization; RESILIENCE, tRial comparing capecitabinE in combination with SorafenIb or pLacebo for treatment of locally advanced or metastatIc HER2-Negative breast CancEr; TTP, time to progression.

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