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- W2624659532 abstract "1000 Background: Abemaciclib, an oral, selective inhibitor of CDK4 & 6, dosed on a continuous schedule, demonstrated clinical activity as monotherapy in patients (pts) with treatment refractory hormone receptor positive (HR+) metastatic breast cancer (MBC). The tolerability and activity of abemaciclib + fulvestrant (F) supported Phase 3 evaluation. Methods: MONARCH 2 is a double-blind Phase 3 trial of abemaciclib + F vs placebo (P) + F in women with HR+/HER2- advanced breast cancer. Women who progressed on (neo)adjuvant endocrine therapy (ET), ≤12 months from end of adjuvant ET, or on first line ET for MBC and who had not received chemotherapy for metastatic disease were eligible. Pts were randomized 2:1 to receive abemaciclib at 150 mg Q12H (or 200 mg prior to amendment) or P plus F (500 mg, per label) and stratified by metastatic site (visceral, bone only, or other) and resistance to prior ET (primary vs secondary). Pre/perimenopausal pts received a gonadotropin-releasing hormone agonist. The primary objective was investigator-assessed progression-free survival (PFS). Secondary endpoints included objective response rate (ORR) and other efficacy and safety endpoints. Assuming a hazard ratio (HR) of 0.703 in favor of abemaciclib + F, 378 events were needed for 90% power at one sided α=.025. Results: 669 pts were randomized to abemaciclib + F (N=446) and to P + F (N=223). 56% of pts had visceral disease, 72% had measurable disease, 25% had primary ET resistance, and 82% were postmenopausal. In the ITT population 379 PFS events were observed with a median PFS of 16.4 m for abemaciclib + F and 9.3 m for P + F (HR: 0.553; 95% CI: 0.449, 0.681, P<.0000001 by log-rank test). In pts with measurable disease, the ORR was 48.1% (3.5% complete response [CR]) for abemaciclib + F and 21.3% (0% CR) for P + F. The most frequent treatment emergent adverse events for abemaciclib + F vs P + F were diarrhea (86.4% vs 24.7%), neutropenia (46.0% vs 4.0%), nausea (45.1% vs 22.9%), and fatigue (39.9% vs 26.9%). Conclusions: Abemaciclib + fulvestrant was an effective treatment in patients with HR+/HER2- advanced breast cancer who progressed on endocrine therapy with significantly improved PFS and ORR. Clinical trial information: NCT02107703." @default.
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- W2624659532 date "2017-05-20" @default.
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- W2624659532 title "MONARCH 2: Abemaciclib in combination with fulvestrant in patients with HR+/HER2- advanced breast cancer who progressed on endocrine therapy" @default.
- W2624659532 doi "https://doi.org/10.1200/jco.2017.35.15_suppl.1000" @default.
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