LBA1010 Background: Taxane-based chemotherapy (CT) improves progression-free survival (PFS) in patients (pts) with newly diagnosed HER2-negative metastatic BC (MBC). SU, an oral multitargeted tyrosine kinase inhibitor (MTKI), demonstrated antitumor activity in combination with D in a phase I/II study in pts with MBC. A randomized, open-label, multicenter phase III trial in pts with newly diagnosed ABC tested the hypothesis that addition of a MTKI to D improves PFS vs. D alone. Methods: Eligible pts (female; ≥18 yrs) had an ECOG PS ≤1, and newly diagnosed HER2-negative MBC or ABC. If (neo)adjuvant therapy included a taxane, relapse must have occurred ≥12 mos after CT. Pts were randomized (1:1) to treatment (tx) with D 75 mg/m2 iv on day 1 and SU 37.5 mg/day po from day 2–15 q3w (Schedule 2/1; Arm A), or to D 100 mg/m2 iv 1-hr infusion q3w (Arm B) that could be given until progression. If D was discontinued in Arm A for reasons other than progressive disease (PD), single-agent SU 37.5 mg daily was permitted until PD. Median, independently assessed, PFS (primary endpoint) was compared between tx arms using stratified and unstratified log-rank tests. Overall objective response rate (ORR), overall survival (OS), pt-reported outcomes, and safety were secondary endpoints. Results: As of the data cutoff (February 1, 2010), the ITT population comprised 593 pts (SU+D, n=296; D, n=297). The trial did not meet its primary endpoint of prolonging PFS based on the independent radiologic assessment or in prolonging OS. Baseline characteristics were well balanced. Median relative dose intensity (RDI) was 94.2% and 92.4% for SU+D, and 92.6% for D arms, respectively. Median PFS was 8.6 mos (95% CI 8.2–10.3) in the SU+D arm vs 8.3 mos (95% CI 7.7–9.6) for the D arm (HR 0.922). Median OS was 24.8 mos (95% CI 21.5–33.1) in SU+D arm vs 25.5 mos (95% CI 22.8–27.8) for D arm (HR 1.207). ORR was significantly better for SU+D (51%) vs. D (39%) (p=0.0018). Frequent all causality grade 3/4 adverse events (≥10%) were neutropenia (46%), hand–foot syndrome (17%), and fatigue (12%) in the SU+D arm and neutropenia (44%) in the D arm. Conclusions: Based on these data, SU+D is not a recommended treatment option for patients with newly diagnosed ABC. Strategies using antiangiogenic TKIs that increase RR but not OS may need to be revisited. [Table: see text]

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Background Everolimus (EVE), an mTOR inhibitor has shown activity in HER2+ advanced breast cancer (ABC) in both preclinical and clinical studies. In the pivotal BOLERO-1 trial (NCT00876395), the progression-free survival (PFS) was not significantly different between the EVE + trastuzumab (TRAS) + paclitaxel (PAC) combination and placebo (PBO) + TRAS + PAC in the full HER2+ population (EVE, 15.0 mo vs PBO, 14.5 mo; HR=0.89; 95% CI: 0.73-1.08; p=0.1166). Although not reaching protocol defined level for statistical significance, the hormone receptor negative (HR-) subpopulation appeared to benefit from EVE, with a 7.2 mo PFS benefit vs PBO arm (EVE, 20.3 mo vs PBO, 13.1 mo; HR=0.66; 95% CI: 0.48-0.91; p=0.0049). The final exploratory overall survival (OS) analysis from the study is presented here. Methods In this phase 3 randomized trial, 719 women with HER2+ ABC without prior TRAS or chemotherapy in the metastatic setting were randomized 2:1 to receive either EVE (10 mg/d) or placebo (PBO) and weekly PAC+TRAS, stratified by visceral metastasis (lung, liver, peritoneal or pleural: yes vs no) and prior adjuvant or neo-adjuvant treatment with TRAS (yes vs no). As the primary objectives (PFS on full population and on HR- subpopulation) of BOLERO-1 were not met, the key secondary endpoint of OS was not formally statistically tested. However, given the results of PFS, in particular in the HR- subpopulation, a change to the OS analysis plan was made by introducing one final exploratory OS analysis at the time of study termination. Results At data cutoff (Dec 31, 2015), the median duration of exposure was 40.8 weeks (range: 0.6-320.4) in the EVE arm and 48.1 weeks (range: 1.1-308.0) in the PBO arm. After a median follow-up of 60.3 mo, 350 deaths were recorded in the full population, 238 (49.6%) in the EVE arm and 112 (46.9%) pts in the PBO arm. In the full population, the median OS was comparable in the EVE vs PBO arms (48.6 mo vs 50.0 mo respectively; HR = 1.13; 95% CI: 0.90-1.42). In the HR- subpopulation, 138 deaths were recorded; 88 (42.3%) pts in the EVE arm and 50 (48.5%) pts in the PBO arm. In the HR- subpopulation, the median OS in the EVE arm was longer compared to PBO arm (57.0 mo vs 41.6 mo respectively; HR = 0.83; 95% CI: 0.59-1.18). Stomatitis, diarrhea, alopecia, cough, rash, pyrexia, neutropenia, and fatigue were the most frequent adverse events (AEs) reported in EVE arm (≥35%). AEs leading to dose interruption and/or change were reported in 441 (93.4%) pts in EVE arm and 165 (69.3%) pts in the PBO arm respectively. Overall, AEs leading to treatment discontinuation were reported in 262 (55.5%) pts in EVE arm and 98 (41.2%) pts in PBO arm. Serious AEs were reported in 171 (36.2%) pts in the EVE arm and 40 (16.8%) pts in the PBO arm respectively. On treatment AE related deaths were reported for 3.6% pts in the EVE arm and 0% pts in the PBO arm. Conclusions The median OS was similar in the EVE vs PBO arms for overall population. However, a prolongation of 15.4 mo in median OS of HR- subpopulation was observed in the EVE arm vs PBO arm in this exploratory analysis. Pts in the EVE arm had a manageable safety, consistent with the safety profile of EVE and no new safety signals were identified. Citation Format: Yardley D, Hurvitz S, Jiang Z-f, Toi M, Burris H, Buyse M, Slamon D, Makhson A, Elsaid A, Lerzo G, Hellerstedt B, Nuzzo F, Sohn J, Manzyuk L, Cabaribere D, Lincy J, Weimann A, Noel-Baron F, Pacaud L, Andre F. Everolimus plus trastuzumab and paclitaxel as first-line therapy in women with HER2+ advanced breast cancer: Overall survival results from BOLERO-1 [abstract]. In: Proceedings of the 2016 San Antonio Breast Cancer Symposium; 2016 Dec 6-10; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2017;77(4 Suppl):Abstract nr P4-22-13.