Suzhou Zelgen Biopharmaceuticals Co., Ltd., together with its subsidiaries, engages in the research, development, manufacture, sale, and distribution of medicines in the People's Republic of China. The company offers donafenib tablets for hepatocellular carcinoma and iodine-refractory differentiated thyroid cancer; recombinant human thrombin for hemostasis; and jacktinib tablets for intermediate and high-risk myelofibrosis. It also develops drug candidates in the NDA, Phase III, or registration clinical trial stages, such as gecacitinib hydrochloride tablets for severe alopecia areata, moderate to severe atopic dermatitis, ankylosing spondylitis, ruxolitinib-intolerant and relapsed/refractory myelofibrosis, moderate to severe plaque psoriasiste, idiopathic pulmonary fibrosis, severe alopecia areata, nonsegmental vitiligo, and myelofibrosis; and recombinant human thyroid-stimulating hormone for injection. In addition, the company is developing drug candidates in Phase I/II clinical trial stages consisting of donafenib tablets for liver cancer and anti-tumor immunotherapy; gecacitinib hydrochloride cream for mild to moderate alopecia areata and atopic dermatitis, and nonsegmental vitiligo; ZG19018 and ZG2001 tablets for KRAS G12C and KRAS mutation late-stage solid tumors; and ZG005, ZGGS18, ZGGS15, ZG0895, and ZG006 powders for injections for late-stage solid tumors.