Nectin-4 Specific LMW PET Probe Imaging in Urothelial Carcinoma

Inclusion Criteria: 1. 18-75 years old, male or female; 2. Heart function is normal; 3. Normal heart function; 4. Estimated survival ≥12 weeks; 5. Good follow-up compliance; 6. presence of at least one measurable target lesion according to RECIST1.1 criteria; 7. Women of childbearing age (15-49 years) must have a negative pregnancy test within 7 days before starting the test; Fertile men and women must agree to use effective contraception to prevent pregnancy during the study period and for 3 months after the test; 8. Patients recommended by clinicians to undergo PET/CT examination for tumor diagnostic staging; 9. The subject patients could fully understand and voluntarily participate in the experiment, and signed the informed consent. Exclusion Criteria: 1. Serious abnormality of liver, kidney and blood; 2. Pregnant patients; 3. Pregnant and lactation women; 3\) unable to lie flat for half an hour; 4) Refuse to join the clinical investigator; 5) Suffering from claustrophobia or other mental diseases; 6) Other conditions that researchers deem unsuitable for participating in the experiment.