Zai Lab Limited, a biopharmaceutical company, engages in discovering or licensing, developing, and commercializing proprietary therapeutics that address medical needs in the fields of oncology, autoimmune, and infectious diseases in China. The company offers Niraparib, an oral small molecule poly ADP ribose polymerase 1/2 inhibitor for the treatment of multiple solid tumors, including ovarian and other types of lung cancer; and Optune, a cancer therapy for the treatment of glioblastoma multiforme. It also develops Ripretinib, a switch control inhibitor for the treatment of KIT and/or PDGFRa-driven cancers, including gastrointestinal stromal tumors, systemic mastocytosis, and other cancers; REGN1979 for the treatment of diffuse large B-cell lymphoma and follicular lymphoma; Margetuximab an immune-optimized anti-HER2 monoclonal antibody for the treatment of breast and gastric cancers; and INCMGA0012, an investigational monoclonal antibody for the treatment of MSI-high endometrial cancer.