A Phase I Study of MSB2311 in Advanced Solid Tumors

Inclusion Criteria: * Able to understand and willing to sign the ICF. * Male or female subject ≥ 18 years. * Histologically/cytologically confirmed, locally advanced unresectable or metastatic solid tumors that are refractory to standard therapy, or for which no standard therapy exists. * Subject has measurable disease per RECIST v1.1. * ECOG Performance Status 0 to 1 * Subjects with life expectancy of ≥ 3 month * No herbal/alternative medications prior to the first dose * Must have adequate hematological, hepatic and renal function as defined in the protocol. * Prior anti-tumor therapies of different kinds must have stopped before the first dose as defined by protocol * Effective contraception for both male and female subjects if the risk of conception exists Exclusion Criteria: * Pregnant or nursing females. * Any remaining AEs \> grade 1 from prior anti-tumor treatment as per CTCAE v4. 03, with exception of the residual hair loss; * Received a biologic G-CSF, GM-CSF or erythropoietin within 14 days prior to the first dose of study drug; * Subjects who had prior treatment with an anti-PD-L1 product * History of documented autoimmune disease except for autoimmune hypothyroidism and well-controlled Type 1 diabetes mellitus. * W/o autoimmune condition requiring systemic treatment with immunosuppressive medications within 14 days before the planned first dose of study drug. * Primacy central nervous system (CNS) malignancy or symptomatic CNS metastases are not allowed, with exceptions defined in protocol. * Major surgery within the 28-days from the screening * Subjects with idiopathic pulmonary fibrosis or unresolved active or chronic inflammatory pulmonary disease are excluded. * History of human immunodeficiency virus (HIV) infection, active hepatitis B or C. HBV carriers * History of primary immunodeficiency, stem cell or organ transplant, or previous clinical diagnosis of tuberculosis disease. * Clinically significant acute infections 4 weeks and any infection 2 weeks prior to the first dose administration. * Known allergies, hypersensitivity, or intolerance to protein-based therapies or with a history of any significant drug allergy * Subjects who experienced immunotherapy-related adverse events (irAE) grade ≥ 3, or who had to discontinue prior anti-PD-1 treatment due to irAEs of any grade. * Severe or uncontrolled cardiac disease requiring treatment as defined in protocol * Any other serious underlying medical, psychiatric, psychological, familial or geographical condition that, in the judgment of the investigator, might impair the subject's benefit from the trial treatment * Known history of hypersensitivity to any components of the MSB2311 product.