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SERENA-4: A Randomised, Multicentre, Double-Blind, Phase III Study of AZD9833 (an Oral SERD) Plus Palbociclib Versus Anastrozole Plus Palbociclib for the Treatment of Patients With Estrogen Receptor-Positive, HER2-Negative Advanced Breast Cancer Who Have Not Received Any Systemic Treatment for Advanced Disease

Primary Outcome Measures : Progression-free survival (PFS) assessed by the Investigator as defined by response evaluation criteria in solid tumors (RECIST) version 1.1 [ Time Frame: From randomization until progression per RECIST 1.1 as assessed by the investigator at local site or death due to any cause (up to 5 years) ] PFS is defined as the time from randomization to objective disease progression (as assessed by RECIST) or death.

Primary Outcome Measures : Progression-free survival (PFS) assessed by the Investigator as defined by response evaluation criteria in solid tumors (RECIST) version 1.1 [ Time Frame: From randomization until progression per RECIST 1.1 as assessed by the investigator at local site or death due to any cause (up to 5 years) ] PFS is defined as the time from randomization to objective disease progression (as assessed by RECIST) or death.