A Phase I Study of AK138D1 in the Treatment of Advanced Solid Tumors

This study is comprised of two parts: the dose-escalation and dose-expansion stages. Dose-escalation stage aims to determine the MTD/MAD, while the dose-expansion stage is designed to establish the RP2D.

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;
• Subjects who have histologically or cytologically diagnosed locally advanced or metastatic solid tumor, which Is refractory to or intolerant to standard treatment;
• At least 1 measurable lesion as per RECIST v1.1 that is suitable for repeated accurate measurement.
• Adequate organ function.

Exclusion criteria

• Prior human epidermal growth factor receptor 3 (HER3) -targeted therapies, including antibodies, antibody-drug conjugates (ADCs), chimeric antigen receptor T-cell immunotherapy (CAR-T), and others;
• 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.
• Patients with a history of non-infectious pneumonitis requiring systemic corticosteroid therapy; a history of interstitial lung disease (ILD) (including pulmonary fibrosis or radiation pneumonitis); currently suffering from ILD/pneumonitis or suspected of having such diseases based on imaging during screening;
• 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 (HBsAg positive and HBV-DNA exceeding 1000 copies/mL (200 IU/mL) and above the lower limit of detection). For HBsAg-positive subjects, anti-hepatitis B therapy is required during the study; subjects with active hepatitis C (HCV antibody positive and HCV-RNA levels above the lower limit of detection) is also an exclusion;
• Known active pulmonary tuberculosis (TB); subjects with suspected active TB must undergo appropriate clinical assessment to rule out the presence of active disease;
• 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.