A Study of GensSci098 in Subjects With Graves' Disease

Inclusion Criteria: * Age ≥ 18 years. * Voluntary signed informed consent. * Confirmed diagnosis of diffuse toxic goiter (Graves' disease). * Abnormal thyroid function tests (e.g., elevated T4, and suppressed TSH). * No prior or recent use of antithyroid medications (discontinued for at least 4 weeks). * Female participants must be postmenopausal, surgically sterile, or using a highly effective method of contraception. * Male participants must agree to practice abstinence, use a highly effective method of contraception， or have undergone vasectomy. * Ability to comply with the follow-up schedule and understand and adhere to the study requirements. Exclusion Criteria: * Non-diffuse toxic goiter-induced hyperthyroidism. * Previous radioactive iodine treatment or thyroid surgery. * History or risk of thyroid storm. * Use of thyroid hormone medications within the past 6 weeks. * accompanied by active thyroid eye disease. * Thyroid eye disease treated with radiation/surgery,or need for urgent surgery surgical or medical intervention. * Optic nerve lesions or corneal damage. * Use of steroids or immunosuppressants within the past 3 months,or those who have used biologics within 6 months * Inability to quit smoking during the study. * Allergy to the study drug or monoclonal antibodies. * Participation in another clinical trial within the past 3 months. * Abnormal electrocardiogram. * Significant hepatic or renal dysfunction. * Pregnancy,breastfeeding,or positive pregnancy test. * Positive for HIV,syphilis,hepatitis B,or hepatitis C. * History of drug or substance abuse. * Other autoimmune diseases requiring treatment. * History of malignant tumors. * Splenectomy or major surgery within the past 6 months. * Severe cardiovascular,pulmonary,hepatic,renal,neurological,or hematological diseases. * Other conditions deemed unsuitable by investigators.