PSMA-Targeted Intraoperative Fluorescent Imaging Agents (DGPR1008): Validation Across Different Time Windows (DGPR1008-04)

A Phase Ⅱ, Single-arm, Open-label Trial of DGPR1008 for Intraoperative Fluorescence Imaging of Prostate-specific Membrane Antigen-positive Prostate Cancer

a Phase II, single-arm, open-label, multi-center study to evaluate safety, tolerability, pharmacokinetics, and the effectiveness of near-infrared fluorescence imaging during surgery.

Study Overview

• Status: Not yet recruiting
• Conditions: Prostate Cancer Patients Undergoing Radical Prostatectomy
• Intervention / Treatment: Drug: 12 h before RP; Drug: 24 h before RP; Drug: 36 h before RP

Detailed Description

We plan to enroll 27 prostate cancer patients and divide them into 3 different time-window groups. Intravenous administration will be conducted 12/24/36 hours before surgery. Blood samples will be collected for relevant tests, and fluorescence imaging will be performed during the operation. After surgery, the intraoperative imaging results will be compared with pathological findings to draw relevant conclusions.

• Study Type: Interventional
• Enrollment (Estimated): 27
• Phase: Phase 2

Contacts and Locations

• Study Contact: Name: Haitao Niu; Phone Number: 86+0532-82911329; Email: niuht0532@126.com
• Study Contact Backup: Name: Xuecheng Yang; Phone Number: 86+18516509790; Email: m18661805062@163.com

Study Locations

• China
  • Shandong
    • Qingdao, Shandong, China, 266000
      • The affiliated hospital of Qingdao university
      • Contact: Shengxian Li; Phone Number: +86 18661808767; Email: lishengxian@qdu.edu.cn

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

1. Subjects diagnosed with prostate cancer through preoperative transrectal prostate biopsy and pathological examination, who are scheduled to undergo radical prostatectomy with or without pelvic lymph node dissection;
2. Subjects must provide informed consent prior to trial initiation, fully understand the trial content, procedures, and potential adverse reactions, be capable of effective communication with the investigator, and be able to complete the trial as per protocol requirements. They must voluntarily sign a written informed consent form;
3. Adult male subjects aged 18 years or older (including the boundary value);
4. Gleason score ≥7, or imaging studies (transrectal ultrasound [TRUS] and/or prostate magnetic resonance imaging [MRI] or CT or PSMA PET/CT) demonstrating disease staging ≥T2, or imaging evidence of regional lymph node enlargement suggestive of lymph node metastasis;
5. No hepatic or renal impairment: Hepatic: Total bilirubin ≤ 2 times the upper limit of normal (ULN) (excluding Gilbert syndrome), alanine aminotransferase (ALT) or aspartate aminotransferase (AST) ≤ 3×ULN; Renal: Creatinine clearance ≥ 50 mL/min/1.73 m² (simplified MDRD formula);
6. The investigator determines the subject has no clear contraindications for surgery and is suitable for radical prostatectomy;
7. The subject and their partner or spouse must agree to have no plans for pregnancy or sperm donation from the screening period until 3 months after trial completion, and voluntarily use effective contraception.

Exclusion Criteria:

Subjects will be excluded if they meet any one of the following criteria:

1. Subjects with a history of allergies (e.g., known allergies to two or more medications), those prone to allergic reactions such as rashes or hives, or those with known allergies to the investigational drug (including its formulation components);
2. Subjects with significantly abnormal screening test results deemed clinically significant by the investigator and likely to affect study participation; or those with concomitant conditions posing serious safety risks or impeding study completion (except where the investigator determines the condition is stable and allows enrollment);
3. Subjects who participated in another clinical trial involving investigational drugs or devices within the month preceding study drug administration;
4. Subjects who have undergone neoadjuvant therapy, radiation therapy, focal ablation therapy, hormone therapy, or androgen deprivation therapy within the past 6 months;
5. Subjects deemed by the investigator to have other conditions rendering them unsuitable for participation in this trial.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Non-Randomized
• Interventional Model: Sequential Assignment
• Masking: None (Open Label)

Number of Arms

3

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: group 1; DGPR1008 (0.04 mg/kg according to each subject's body weight) was given as a single slow infusion 12 hours (±4 hours) preoperatively, after which radical prostatectomy was performed. The investigator shall conduct near-infrared fluorescence imaging during the operation to assist with the surgery. Tissues detected with fluorescence need to be marked, and resection shall be guided by fluorescence until there is no fluorescent tissue within the surgical field.	Drug: 12 h before RP; DGPR1008 (0.04 mg/kg according to each subject's body weight) was given as a single slow infusion 12 hours (±4 hours) preoperatively, after which radical prostatectomy was performed. The investigator shall conduct near-infrared fluorescence imaging during the operation to assist with the surgery. Tissues detected with fluorescence need to be marked, and resection shall be guided by fluorescence until there is no fluorescent tissue within the surgical field.
Experimental: group 2; DGPR1008 (0.04 mg/kg according to each subject's body weight) was given as a single slow infusion 24 hours (±4 hours) preoperatively, after which radical prostatectomy was performed. The investigator shall conduct near-infrared fluorescence imaging during the operation to assist with the surgery. Tissues detected with fluorescence need to be marked, and resection shall be guided by fluorescence until there is no fluorescent tissue within the surgical field.	Drug: 24 h before RP; DGPR1008 (0.04 mg/kg according to each subject's body weight) was given as a single slow infusion 24 hours (±4 hours) preoperatively, after which radical prostatectomy was performed. The investigator shall conduct near-infrared fluorescence imaging during the operation to assist with the surgery. Tissues detected with fluorescence need to be marked, and resection shall be guided by fluorescence until there is no fluorescent tissue within the surgical field.
Experimental: group 3; DGPR1008 (0.04 mg/kg according to each subject's body weight) was given as a single slow infusion 36 hours (±4 hours) preoperatively, after which radical prostatectomy was performed. The investigator shall conduct near-infrared fluorescence imaging during the operation to assist with the surgery. Tissues detected with fluorescence need to be marked, and resection shall be guided by fluorescence until there is no fluorescent tissue within the surgical field.	Drug: 36 h before RP; DGPR1008 (0.04 mg/kg according to each subject's body weight) was given as a single slow infusion 36 hours (±4 hours) preoperatively, after which radical prostatectomy was performed. The investigator shall conduct near-infrared fluorescence imaging during the operation to assist with the surgery. Tissues detected with fluorescence need to be marked, and resection shall be guided by fluorescence until there is no fluorescent tissue within the surgical field.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Evaluate the efficacy of DGPR-1008 (administered 12 hours prior) in conjunction with a near-infrared fluorescence imaging device for intraoperative detection in patients.	Detection of prostate cancer tissue by DGPR1008 using near-infrared fluorescence (NIR) imaging at 12 hours after intravenous administration to subjects. Evaluate the sensitivity (or true positive rate, TP/[TP+FN]), specificity (or true negative rate, TN/[TN+FP]), false positive rate (FP/[FP+TN]), and false negative rate (FN/[FN+TP]) of DGPR-1008 for detecting prostate cancer tissue in near-infrared fluorescence imaging (NIR) during radical prostatectomy. The proportion of additionally resected tissues that are diagnosed as tumors by pathological evaluation.	From the screening period to the Day 7 of the trial
Evaluate the efficacy of DGPR-1008 (administered 24 hours prior) in conjunction with a near-infrared fluorescence imaging device for intraoperative detection in patients.	Detection of prostate cancer tissue by DGPR1008 using near-infrared fluorescence (NIR) imaging at 24 hours after intravenous administration to subjects. Evaluate the sensitivity (or true positive rate, TP/[TP+FN]), specificity (or true negative rate, TN/[TN+FP]), false positive rate (FP/[FP+TN]), and false negative rate (FN/[FN+TP]) of DGPR-1008 for detecting prostate cancer tissue in near-infrared fluorescence imaging (NIR) during radical prostatectomy. The proportion of additionally resected tissues that are diagnosed as tumors by pathological evaluation.	From the screening period to the Day 7 of the trial
Evaluate the efficacy of DGPR-1008 (administered 36 hours prior) in conjunction with a near-infrared fluorescence imaging device for intraoperative detection in patients.	Detection of prostate cancer tissue by DGPR1008 using near-infrared fluorescence (NIR) imaging at 36 hours after intravenous administration to subjects. Evaluate the sensitivity (or true positive rate, TP/[TP+FN]), specificity (or true negative rate, TN/[TN+FP]), false positive rate (FP/[FP+TN]), and false negative rate (FN/[FN+TP]) of DGPR-1008 for detecting prostate cancer tissue in near-infrared fluorescence imaging (NIR) during radical prostatectomy. The proportion of additionally resected tissues that are diagnosed as tumors by pathological evaluation.	From the screening period to the Day 7 of the trial

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Evaluate DGPR1008 combined with near-infrared fluorescence imaging devices for detecting positive margins in histopathological examination following radical prostatectomy	To evaluate the proportion of subjects with a positive surgical margin (PSM) score of ≥1, as assessed by histopathology, at different time points after radical prostatectomy.	From the screening period to the Day 7 of the trial
Evaluate DGPR1008 combined with near-infrared fluorescence imaging devices for detecting positive lymph nodes in histopathological examination following radical prostatectomy	To evaluate the proportion of subjects with positive lymph nodes, as assessed by histopathology, at different time points after radical prostatectomy.	From the screening period to the Day 7 of the trial
Evaluate the safety of single-dose administration of DGPR1008 in patients	Adverse event collection, including (such as the location, nature, and frequency of pain), physical signs (such as the scope of rash, blood pressure values), laboratory abnormal values and units (such as ALT 200 U/L), etc.	From the screening period to the Day 7 of the trial

Collaborators and Investigators

• Sponsor: Haitao Niu, MD

Study record dates

Study Major Dates

• Study Start (Estimated): February 27, 2026
• Primary Completion (Estimated): July 27, 2026
• Study Completion (Estimated): September 27, 2026

Study Registration Dates

• First Submitted: January 28, 2026
• First Submitted That Met QC Criteria: January 28, 2026
• First Posted (Actual): February 4, 2026

Study Record Updates

• Last Update Posted (Actual): February 4, 2026
• Last Update Submitted That Met QC Criteria: January 28, 2026
• Last Verified: January 1, 2026

More Information

Terms related to this study

• Other Study ID Numbers: QYFYEC2026-009-01

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: YES
• IPD Sharing Supporting Information Type: ICF

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No