Could an immunotherapy drug keep kidney cancer from returning after surgery?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

1. INCLUSION CRITERIA Participants must meet ALL of the following criteria to be eligible for study enrollment: 1.1 Informed Consent Capable of giving signed informed consent； Willing to comply with all study procedures； Signed and dated written informed consent obtained prior to any study-specific procedures. 1.2 Age and Sex Age ≥18 years at time of consent； Male and female participants eligible. 1.3 Disease Characteristics Histologically confirmed renal cell carcinoma with clear cell component; Must have undergone nephrectomy with complete resection; No evidence of residual tumor confirmed by imaging; Must meet at least ONE of the following high-risk criteria: pT2,with Fuhrman Grade IV or sarcomatoid,N0,M0;pT3/4,N0M0 (any grade);Any T classification with N1,M0;Post nephrectomy(total/partial) plus complete resection of metastasis, M1 NED. 1.4 Brain Metastasis No suspected or confirmed active brain metastases. 1.5 Performance Status Eastern Cooperative Oncology Group (ECOG) performance status 0-1. 1.6 Organ Function (within 14 days prior to enrollment, without transfusion or growth factor support) Hematopoietic function: Absolute neutrophil count ≥1,500/mm³; Platelet count ≥100,000/mm³; Hemoglobin ≥9.0 g/dL (5.6 mmol/L) Hepatic function: Total bilirubin ≤1.5 × ULN; AST and ALT ≤1.5 × ULN Renal function: Serum creatinine ≤1.5 mg/dL; OR creatinine clearance ≥60 mL/min (Cockcroft-Gault formula) 1.7 Contraception Females of childbearing potential must use medically approved contraception during treatment and for 3 months after last dose; Negative serum or urine pregnancy test within 7 days prior to randomization for women of childbearing potential; Non-lactating females; Males with female partners of childbearing potential must use effective contraception during treatment and for 3 months after last dose 1.8 Compliance Voluntarily agrees to participate by signing informed consent; Willing and able to comply with scheduled visits, treatment plans, laboratory tests, and other study procedures 2. EXCLUSION CRITERIA Participants meeting ANY of the following criteria will be excluded from study participation: 2.1 Prior Therapy Previous radiotherapy, chemotherapy, targeted therapy, long-term or high-dose hormone therapy, or any immune checkpoint inhibitor treatment. 2.2 Concurrent Malignancy History of or current concurrent malignancy (except adequately treated basal cell carcinoma of skin, carcinoma in situ of cervix, etc.). 2.3 Allergy and Prior Immunotherapy Previous treatment with other PD-1/PD-L1 inhibitors; Known hypersensitivity to macromolecular protein preparations or any PD-1 inhibitor components. 2.4 Autoimmune Disease Active autoimmune disease or history of autoimmune disease; Exceptions:Controlled type 1 diabetes, hypothyroidism requiring only hormone replacement, skin diseases not requiring systemic treatment (vitiligo, psoriasis), or childhood asthma in complete remission without intervention in adulthood. 2.5 Immunosuppressive Therapy Current use of immunosuppressants (e.g., systemic corticosteroids \>10 mg/day prednisone equivalent) for immunosuppressive purposes, continued within 2 weeks prior to enrollment. 2.6 Cardiovascular Disease Poorly controlled cardiac clinical symptoms or diseases, including: NYHA Class II or higher heart failure; Unstable angina pectoris; Myocardial infarction within 1 year; Clinically significant arrhythmias requiring treatment 2.7 Coagulation Function Abnormal coagulation function with bleeding tendency; Current thrombolytic or anticoagulant therapy; 2.8 Gastrointestinal Disease Current active gastrointestinal diseases including: Esophageal varices; Active ulcers; Inflammatory bowel disease; Risk of perforation or bleeding; 2.9 Hemorrhage and Thrombosis Events History of or current severe hemorrhage, hemoptysis, or thrombotic events within 12 months. 2.10 Infection Active infection requiring systemic therapy; Unexplained fever \>38.5°C during screening or before first dose; Congenital or acquired immunodeficiency, including HIV infection or active hepatitis 2.11 Other Medical Conditions History of severe pulmonary fibrosis, interstitial pneumonia, radiation pneumonia; Live vaccination within 4 weeks prior to study treatment; History of psychotropic drug abuse, alcoholism, or drug addiction 2.12 Administrative Reasons Participation in another clinical study or within 1 month after completion of previous clinical study; Any condition that, in the investigator's judgment, may lead to early study termination affecting participant safety or data quality 3. WITHDRAWAL CRITERIA Participants will be withdrawn from study treatment if ANY of the following occurs: 3.1 Participant Request Participant or legal representative requests withdrawal 3.2 Disease Progression Confirmed disease progression 3.3 Intolerable Toxicity Occurrence of intolerable toxicities 3.4 Investigator Judgment Investigator determines continued participation may harm the participant 3.5 Protocol Violations Pregnancy Loss to follow-up Major protocol violation 3.6 Treatment Delay Any cause leading to treatment delay \>2 weeks.