A Study of AK138D1 Alone or in Combination With Ivonescimab in Advanced Breast Cancer

This is a multicenter, open-label Phase Ib/II study of AK138D1 as monotherapy or in combination with ivonescimab in patients with advanced breast cancer. The Phase Ib portion is designed to evaluate the safety, tolerability, and preliminary antitumor activity of AK138D1 in combination with ivonescimab. The Phase II portion is designed to evaluate the safety and efficacy of AK138D1 as monotherapy or in combination with ivonescimab.

Inclusion criteria

• The subject must sign the written informed consent form (ICF) voluntarily;
• At enrollment, aged ≥ 18 to ≤ 75 years, both males and females are eligible;
• ECOG performance status score of 0 or 1;
• Has a life expectancy of ≥ 3 months;
• At least 1 measurable lesion as per RECIST v1.1 that is suitable for repeated accurate measurement.
• Adequate organ function.

Exclusion criteria

• Concomitant participation in another clinical study, unless it is a non-interventional clinical study or the follow-up period of an interventional study;
• Presence of active central nervous system (CNS) metastases.
• Live vaccines or attenuated live vaccines administered within 4 weeks prior to the first dose, or planned to be administered during the study; use of inactivated vaccines is allowed;
• Untreated subjects with active hepatitis B or active hepatitis C;
• Known active pulmonary tuberculosis (TB); subjects with suspected active TB must undergo appropriate clinical assessment to rule out the presence of active disease;
• Known active syphilis infection;
• Subjects with known allergy to any component of any study drug; and with a history of known severe hypersensitivity reactions to other monoclonal antibodies;
• Other reasons for ineligibility as evaluated by the investigator.