An Epidemiological, Prospective Cohort Study to Generate Real-world Evidence in Patients with HR*/HER2- Advanced Breast Cancer Treated in the First-line Setting as per Current Standard of Care with an Endocrine-based Palbociclib Combination Therapy

A Phase III, Double-blind, Randomised Study to Assess Switching to AZD9833 (a Next Generation, Oral SERD) + CDK4/6 Inhibitor (Palbociclib or Abemaciclib) vs Continuing Aromatase Inhibitor (Letrozole or Anastrozole)+ CDK4/6 Inhibitor in HR+/HER2-MBC Patients With Detectable ESR1Mutation Without Disease Progression During 1L Treatment With Aromatase Inhibitor+ CDK4/6 Inhibitor- A ctDNA Guided Early Switch Study