The goal of this clinical trial is to evaluate if KSHN001034 demonstrates safety, tolerability, and a comparable pharmacokinetic (PK) profile to the reference product, Faslodex® (fulvestrant), which is used for the treatment of hormone receptor-positive breast cancer. Participants will: Receive either the test product (KSHN001034) or the reference product (Faslodex®) administered intramuscularly (IM) or subcutaneously (SC) at doses of low, medium, or high , with doses conducted in 5 cohorts and these participants will be healthy postmenopausal female volunteers. Dosing will be administered in a sequential cohort-wise manner across five cohorts, with DSMB oversight for safety monitoring and dose escalation. Primary Endpoint: Safety and tolerability will be assessed based on the occurrence, severity, and relationship of adverse events (AEs), including serious adverse events (SAEs). Secondary Endpoint: Pharmacokinetic (PK) parameters will be evaluated, including Cmax (maximum concentration), Tmax (time to maximum concentration), AUC (area under the curve), and T1/2 (half-life).
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Number of participants with treatment-related Adverse events as assessed by CTCAE v5.0
Timeframe: up to 36 days after dosing