CD70-targeted immunoPET Imaging of Kidney Cancer

The aim of this study is to establish and optimize the \[18F\]RCCB6 PET/CT imaging method, and its physiological and pathological distribution characteristics, on the basis of which the diagnostic efficacy of the above imaging agent in renal cancer (especially clear cell renal cell carcinoma) wil be evaluated.

Histologically confirmed diagnosis of kidney cancer (especially clear cell renal cell carcinoma and papillary renal cell carcinoma) or suspected kidney cancer by diagnostic imaging will be included. Especially patients with suspected metastases or routine follow-up or surveillance or suitable for systemic treatments (e.g., combined immunotherapy and targeted therapies) will undergo \[18F\]RCCB6 immunoPET/CT scans. Enrolled patients will undergo whole-body \[18F\]RCCB6 immunoPET/CT scans at 1 hour after tracer injection(0.05-0.1 mCi/kg). Uptake of \[18F\]RCCB6 in tumor and normal organs/tissues will be scored visually and quantitatively. Tumor uptake will be quantified by the maximum standard uptake value (SUVmax). The sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV), and accuracy will be calculated to evaluate the diagnostic efficacy. Furthermore, we will compare the diagnostic rates of \[18F\]RCCB6 immunoPET/CT with those of conventional imaging examinations, such as CT, MRI, and 18F-FDG PET/CT, etc.The correlation between lesion uptake and protein expression level determined by immunohistochemistry staining will be further analyzed. Further explore the value of \[18F\]RCCB6 in treatment decision-making（staging, surveillance, and restaging） for kidney cancer.We will conduct an interim assessment when more than half of the patients have been enrolled.