A Phase 2 Study to Evaluate the Efficacy, Safety and Pharmacokinetics of YL202 in Patients With BC

Exclusion Criteria22

• Have prior treatment with an agent targeting HER3.
• Have prior intolerance to treatment with topoisomerase I inhibitor or an ADC that consists of topoisomerase I inhibitor.
• Have been enrolled in another clinical study concurrently unless it is an observational clinical study or in the follow-up phase of an interventional study.
• Have insufficient washout period for prior anticancer therapy prior to first dose of the study drug.
• Have major surgery (excluding diagnostic surgery) within 4 weeks prior to the first dose of study drug or anticipation of major surgery during the study.
• Have prior allogeneic bone marrow transplant or prior solid organ transplant.
• Have received treatment with systemic steroids.
• Have received any live vaccine within 4 weeks prior to the first dose of study drug or intend to receive a live vaccine during the study.
• Leptomeningeal metastases or carcinomatous meningitis, spinal cord compression.
• Brain metastases with the exceptions.
• Have uncontrolled or clinically significant cardiovascular and cerebrovascular disease.
• Have clinically significant concomitant pulmonary diseases.
• Have a diagnosis of Gilbert's syndrome.
• Have pleural effusion, abdominal effusion.
• Have a history of gastrointestinal perforation and or fistula within 6 months prior to the first dose.
• Have serious infection.
• Patients with human immunodeficiency virus (HIV) infection.
• Have active hepatitis B virus (HBV) or hepatitis C virus (HCV) infection.
• Have any other primary malignancy within 5 years prior to the first dose of study drug.
• Have unresolved toxicities from prior anticancer therapy.
• Have a history of severe hypersensitivity reactions to the drug substance, inactive ingredients in the drug product, or other monoclonal antibodies.
• Lactating women, or women who are confirmed to be pregnant by pregnancy test within 3 days prior to the first dose.