The study will include multiple cohorts: triple-negative breast cancer (TNBC), HR-positive HER2-negative breast cancer, and other solid tumors.
Participants will receive SC-101 at a dose of 7.5 mg/m² once weekly, with treatment cycles lasting 28 days. The study aims to assess tumor response and safety until disease progression or other reasons for treatment discontinuation.
Eligibility requires patients to have locally advanced or metastatic tumors that have either relapsed after standard treatment, are resistant to treatment, or are not amenable to standard treatment. NECTIN4 gene amplification must be confirmed via tumor tissue testing.
Imaging assessments will be conducted every 8 weeks to evaluate tumor response. Safety follow-up will be performed 30 days after the last dose, with additional survival follow-ups every 12 weeks thereafter.
