A Study of Penpulimab Combination Therapy in Patients With Advanced Nasopharyngeal Carcinoma

Inclusion Criteria: * Signed written informed consent form voluntarily. * Age over 18 years old (inclusive) and not more than 75 years old (inclusive), when signing the ICF. * Eastern Cooperative Oncology Group (ECOG) performance score 0 or 1. * Expected life expectance ≥ 3 months. * Histologically confirmed diagnosis of stage IVb NPC (AJCC 8th). * Metastatic NPC patients who have not recieved the first-line platinumbased chemotherapy. * At least one measurable tumor lesion per RECIST 1.1 criteria. * Subjects must provide an available tumor tissue sample taken within 3 years prior to enrollment. * Adequate organ function. * Females of childbearing potential who are sexually active with a nonsterilized male partner must use at least one highly effective method of contraception. * Nonsterilized males who are sexually active with a female partner of childbearing potential must use highly effective method of contraception from Day 1 and for 120 days after the last dose of investigational product. Exclusion Criteria: * Other invasive malignancies within 2 years, except for locally treatable (manifested as cured) malignancies, such as basal or skin squamous cell carcinoma, superficial bladder cancer, cervical or breast carcinoma in situ. * Is currently participating in a study of an investigational agent or using an investigational device. * Has known active central nervous system (CNS) metastases. * Has an active autoimmune disease that has required systemic treatment in the past 2 years (i.e. with use of disease modifying agents, corticosteroids or immunosuppressive drugs). Replacement therapy (e.g., thyroxine, insulin or physiologic corticosteroid replacement therapy for adrenal or pituitary insufficiency, etc.) is not considered a form of systemic treatment NOTE: Subjects with vitiligo or resolved childhood asthma/atopy would be an exception to this rule. Subjects that require intermittent use of bronchodilators or local steroid injections would not be excluded from the study. * Has an active infection requiring systemic therapy. * Has known active Hepatitis B (e.g., HBsAg reactive) or Hepatitis C (e.g., HCV RNA \[qualitative\] is detected). * History of myocardial infarction, unstable angina, cardiac or other vascular stenting, angioplasty, or surgery within 12 months prior to day 1 of study treatment. * Has undergone major surgery within 30 days of Study Day 1. * Has received a live virus vaccine within 30 days of the planned first dose of study therapy. * Has known psychiatric or substance abuse disorders that would interfere with cooperation with the requirements of the study. * Is pregnant, breastfeeding, or expecting to conceive or father a child within the projected duration of the study including 120 days following the last dose of study treatment. * Has a history or current evidence of any condition, therapy, or laboratory abnormality that might confound the results of the study, interfere with the subject's participation for the full duration of the study, or is not in the best interest of this subject to participate, in the opinion of the treating investigator.