68Ga-NY104 PET/CT in Patients With Metastasis/Recurrence Clear Cell Renal Cell Carcinoma Suspicion

Inclusion Criteria: 1. Age ≥ 18 y 2. Histopathological diagnosis of clear cell renal cell carcinoma 3. Suspected of metastasis or recurrence from ccRCC based on previous conventional imaging or 18F-FDG PET/CT scan. 4. Expected survival of at least 6 months 5. ECOG ≤ 2 6. Written informed consent provided for participation in the trial 7. In the opinion of investigator, willing and able to comply with required study procedures. Exclusion Criteria: 1. On VEGF TKI treatment less than 1 week before 68Ga-NY104 PET/CT. TKI is known to affect girentuximab binding in patients with ccRCC and is expected to have the same effect on 68Ga-NY104. If patients were on VEGF TKI treatment, such as sunitinib, sorafenib, cabozantinib, pazopanib, or lenvatinib, a washout of one week before 68Ga-NY104 PET/CT is required. 2. Patients on HIF antagonist treatment \< 3 months before 68Ga-NY104 PET/CT. CA9, which encodes carbonic anhydrase IX (CAIX), is one of the genes most strongly upregulated by HIF-1. HIF antagonist, such as Belzutifan, might affect the expression of CAIX and thus the binding of 68Ga-NY104 to tumor. Withdraw of at least 3 months is required for HIF antagonist. 3. Pregnancy or breastfeeding. 4. Severe claustrophobia.