• Wolfgang Janni, Emilio Alba, Thomas Bachelot, Sami Diab, Miguel Gil-Gil, Thaddeus J Beck, Larisa Ryvo, Rafael Lopez, Michaela Tsai, Francisco J Esteva, Pilar Zamora Auñón, Zdenek Kral, Patrick Ward, Paul Richards, Timothy J Pluard, Santosh Sutradhar, Michelle Miller, and Mario Campone.
• University of Ulm, Helmholtzstraße 18, 89081, Ulm, Germany. Wolfgang.Janni@uniklinik-ulm.de.
• Breast Cancer Res. Treat. 2018 Jun 1; 169 (3): 469-479.

PurposeThe phase 3 MONALEESA-2 study demonstrated that addition of ribociclib (RIB) to letrozole (LET) significantly improved progression-free survival (PFS) in patients (pts) with hormone receptor-positive (HR+), HER2-negative (HER2-) advanced breast cancer (ABC). Here, we evaluated duration of response (DoR), tumor shrinkage, PFS by treatment-free interval (TFI), and health-related quality of life (HRQoL).MethodsPostmenopausal women (N = 668) with HR+ , HER2- ABC and no prior systemic therapy for ABC were randomized to RIB (600 mg/day; 3 weeks on/1 week off) plus LET (2.5 mg/day; continuous) or placebo (PBO) plus LET. Primary end point was PFS; HRQoL was the secondary end point; DoR was exploratory end point and PFS by TFI was post hoc analysis.ResultsOf 501 pts with measurable disease and confirmed complete or partial response, median DoR was 26.7 months (95% CI, 24.0-NR) in the RIB arm versus 18.6 months (95% CI, 14.8-23.1) in the PBO arm. At 8 weeks, more pts in the RIB arm (32%) versus the PBO arm (17%) experienced best percentage change ≥ 60%. The average pain reduction was greater in the RIB arm (26%) versus the PBO arm (15%). PFS benefit was seen with RIB vs PBO, irrespective of TFI.ConclusionRIB plus LET versus PBO plus LET is associated with earlier and more durable tumor response, greater degree of tumor shrinkage and pain reduction, and PFS benefit irrespective of TFI. These data further support RIB plus LET as a first-line treatment option for postmenopausal women with HR+ , HER2- ABC.

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