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Background
1L=first line; AI=aromatase inhibitor; CDK4/6i=cyclin-dependent kinase 4/6 inhibitor; ET=endocrine therapy; HR=hazard ratio; ITT=intent to treat; LHRH=luteinizing hormone-releasing hormone; mBC=metastatic breast cancer; mOS=median overall survival; NR=not reached; NSAI=nonsteroidal aromatase inhibitor; OS=overall survival; PFS=progression-free survival; QTcF=QT interval corrected by Fridericia’s formula.
 
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