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A randomized double-blind, placebo-controlled study of LEE011 in combination with letrozole for the treatment of postmenopausal women with hormone receptor positive, HER2-negative, advanced breast cancer who received no prior therapy for advanced disease (CLEE011A2301)

Primary objective: Progression free survival (PFS) of treatment with letrozole plus LEE011 compared to treatment with letrozole plus placebo .Secondary objectives: Overall survival (OS), overall response rate (OR), overall clinical benefit rate,…