本研究的目的是在激素受体阳性/人表皮生长因子受体-2阴性（ HR +/HER2- ）不可切除的局部晚期或转移性乳腺癌参与者中，比较sacituzumab tirumotecan作为单一药物，以及与pembrolizumab联合治疗的医师选择（ TPC ）。 主要假设是Sacituzumab tirumotecan作为单一药物和Sacituzumab tirumotecan加上pembrolizumab a
适应症：Breast Neoplasms
入组条件
纳入标准
- Has unresectable locally advanced or metastatic centrally-confirmed hormone receptor positive (HR+)/human epidermal growth factor receptor 2 negative (HER2-) breast cancer
- Has radiographic disease progression on one or more lines of endocrine therapy for unresectable locally advanced/metastatic HR+/HER2- breast cancer, with one in combination with a CDK4/6 inhibitor
- Is a chemotherapy candidate
- Has an eastern cooperative oncology group (ECOG) performance status of 0 to 1 assessed within 7 days before randomization
- Has adequate organ function
- Human immunodeficiency virus (HIV)-infected participants must have well controlled HIV on antiretroviral therapy
- Participants who are Hepatitis B surface antigen (HBsAg) positive are eligible if they have received HBV antiviral therapy for at least 4 weeks, and have undetectable HBV viral load
- Participants with a history of Hepatitis C virus (HCV) infection are eligible if HCV viral load is undetectable
排除标准
- Has breast cancer amenable to treatment with curative intent
- Has experienced an early recurrence (\<6 months after completing adjuvant/neoadjuvant chemotherapy) and therefore is eligible to receive second-line (2L) treatment
- Has symptomatic advanced/metastatic visceral spread at risk of rapidly evolving into life-threatening complications
- Has received prior chemotherapy for unresectable locally advanced or metastatic breast cancer
- Active autoimmune disease that has required systemic treatment in the past 2 years
- History of (noninfectious) pneumonitis/interstitial lung disease that requires steroids, or has current pneumonitis/interstitial lung disease
- Has an active infection requiring systemic therapy
入组条件维持 ClinicalTrials.gov 原始英文登记资料，实际入组资格以研究团队的正式评估与受试者知情同意书为准。资料来源：ClinicalTrials.gov，每两周自动更新，最后同步：2026年10月8日。