A multicenter, open-label, prospective Phase III clinical trial to evaluate INR101 injection for PET/CT imaging in participants with suspected recurrent prostate cancer after radical treatment.

This is a prospective, multicenter, open-label, single-arm, non-randomized Phase III clinical trial evaluating the diagnostic efficacy and safety of INR101 injection PET/CT imaging in participants with suspected recurrence prostate cancer, who have experienced an increase in PSA levels after previously receiving radical treatment.

Participants enrolled in clinical trial will receive a single intravenous injection of INR101 injection at a dose of 7 mCi ± 15%, and PET/CT imaging will be performed 80 to 120 minutes after the injection.

The PET/CT images of INR101 injection for each participant will be interpreted independently by two readers blinded to all participant information. When the conclusions of the two readers are inconsistent, a third reader will be added for an adjudication interpretation (the third reader will also be in a blinded during the interpretation process and shall not be aware of the conclusions of the first two readers).

This study adopts a composite diagnostic criterion as the standard of truth. The interpretation of the composite diagnostic criterion is as follows: If a pathological diagnosis can be obtained, the pathological diagnosis shall be regarded as the standard of truth; if a pathological diagnosis cannot be obtained, a comprehensive interpretation shall be made based on the participant's medical history, changes in PSA levels and the results of conventional imaging examinations. The interpretation of the composite diagnostic criterion for each participant will be interpreted independently by two readers. When the conclusions of the two readers are inconsistent, a third reader will be added for an adjudication interpretation.

Inclusion Criteria:

1. Males aged ≥18 years old

2. ECOG score of 0 or 1

3. Participants confirmed as prostate adenocarcinoma by histological pathological diagnosis, and have an elevated PSA level and are suspected of recurrence after previously receiving radical prostatectomy and/or radical radiotherapy (the PSA level is ≥ 0.2 ng/mL in two consecutive tests after 6 weeks following radical prostatectomy; or the PSA level is increased by ≥ 2 ng/mL compared to the lowest value after radical radiotherapy).

4. Routine blood tests, liver and kidney function meet the corresponding conditions:

   • Hemoglobin > 80 g/L; Platelet count > 50×10⁹/L
   • AST, ALT≤ 5 x ULN
   • Total bilirubin≤ 3 x ULN

5. Life expectancy of at least 6 months as assessed by investigator

6. Agree to use contraceptive measures from the date of signing the informed consent form to 3 months after medication administration, and avoid sperm donation

7. The participant/legal authorized representative understands the purpose and procedures of the trial and signs the informed consent form

Exclusion Criteria:

1. Participants who are unable to complete the imaging as required
2. Having had ≥ 2 types of malignant tumors within 5 years prior to the first administration, with the exception of fully treated non-metastatic thyroid cancer, basal cell carcinoma of the skin, superficial squamous cell carcinoma of the skin, and superficial bladder cancer.
3. Participants in other interventional clinical trials and within 5 half-lives of the investigational medicinal product or participants in other interventional clinical trials before signing the informed consent form; or participants in clinical trials of radioactive therapeutic drugs before signing the informed consent form and the time from the drug withdrawal to the signing date of the informed consent form is less than 3 months.
4. Have received intravenous iodine contrast agent within 24 hours prior to the administration of INR101, or have received any high-density oral contrast agent within 5 days (except for those who, as judged by the investigator, have no residual contrast agent in the intestines; oral water-soluble contrast agents are acceptable).
5. Participants with a history of salivary gland diseases or Paget's disease; participants with a history of fracture within the past year
6. Participants with hip joint prostheses
7. Known allergy to the active ingredients of INR101 or its components
8. Investigators judge that there are any medical diseases or other conditions that may affect safety, compliance or may affect the study results.