Safety, Pharmacokinetics, and Efficacy of AI-081, a Bispecific Antibody for PD-1 And VEGF in Advanced Solid Tumors

Inclusion Criteria: * Patient is ≥ 18 years of age on the day of signing informed consent. * Male or female, female patient of childbearing potential must have negative pregnancy test. * Patient must have a performance status of ≤ 1 on the ECOG Performance Scale. * Patients must have a histological or cytological diagnosis of solid tumors and have metastatic disease or locally advanced disease. * Measurable disease as determined by RECIST 1.1 * Patient must have adequate organ function as indicated by the following laboratory values * Patient has voluntarily agreed to participate by giving written informed consent. * Female patients enrolled in the study, if having childbearing potential (WOCBP) and sexually active, must agree to use adequate and effective birth control starting with the first dose of study drug through 90 days after the last dose of study therapy. * Male patients, if sexually active, must agree to use adequate and effective methods of contraception starting with the first dose of study drug through 90 days after the last dose of study therapy. Exclusion Criteria: * Patients who have not recovered to NCI CTCAE grade ≤ 1 from an adverse event (AE) due to cancer therapeutics except the chemotherapy-associated peripheral neuropathy (motor or sensory) or alopecia. Patients with ongoing and adequately controlled endocrine immune-related AEs are considered stable and eligible for enrollment. The washout period for treatment regimen containing monoclonal antibodies is 28 days. Palliative radiotherapy for painful metastases or metastases in potentially sensitive locations (e.g., epidural space) ≥ 7 days prior to the first dose of study drug. Best supportive care, such as thyroxine, insulin, steroid replacement treatment, blood transfusion and therapy for non-cancer condition are allowed. * Patients who are currently enrolled in any other clinical trial testing an investigational agent or device, or with concurrent anticancer treatment (except palliative bone-directed radiotherapy), immune therapy, or cytokine therapy or anticipated to require another antineoplastic therapy during the study. * Patients who are on chronic systemic steroid therapy at doses higher than 10 mg/day prednisone or equivalent within 7 days before first treatment. * Patients who have brain metastases or leptomeningeal metastases. * Patient with a different cancer other than the one treated under this protocol, which requires systemic treatments within 24 months prior to C1D1. * Patient has history of grade ≥3 allergic or hypersensitivity to IV infusion medications, or severe allergic reactions to food, pollen, oral medications, or atopic dermatitis or asthmatic episodes that required hospitalization. * Within past 6 months with history of significant cardiovascular acute myocardial infarction, acute coronary syndrome, ischemic or hemorrhagic stroke, revascularization procedures, acute pulmonary embolism or any disorders resulted in LVEF \< 40% at the time of screening or colitis, small bowel obstruction, hepatitis or pancreatitis adrenal insufficiency, or severe immunotherapy related AE (irAE≥ grade 3). * Patients who have acute infections which require systemic treatments within 14 days prior to C1D1. * Patients who, in the opinion of the treating Investigator, have a history or current evidence of any condition, therapy, or laboratory abnormality that might confound the results of the study, interfere with the patient's participation for the full duration of the study, or make study participation not in the best interest of the patient, in the opinion of the treating Investigator. Investigators should discuss the case with the Sponsor and/or study leaders. * Patients with known psychiatric or substance abuse disorders may interfere with cooperation with the requirements of the trial. * Patients who are pregnant or breastfeeding or plan pregnancy or fathering the child during the study or within 6 months after the last dosing of study drug * Patients with tumor surrounds important blood vessels or has obvious necrosis, cavitation, or invades surrounding important organs and blood vessels or otherwise with high risk of fatal hemorrhage * Uncontrolled hypertension: systolic pressure ≥ 150 millimeters of mercury (mmHg) or diastolic pressure ≥ 90 mmHg on repeated measurements that cannot be managed by standard antihypertension medications ≤ 28 days before the first dose of study drug(s). * Medical history of cardiovascular diseases, gastrointestinal perforation or gastrointestinal fistula within 6 months prior to the first dose. * Patients with clinically symptomatic pleural effusion, pericardial effusion, or ascites requiring frequent drainage. * With a history of interstitial lung disease, non-infectious pneumonitis, or uncontrolled systemic diseases, including diabetes, hypertension, pulmonary fibrosis, acute lung diseases, etc.