Clinical Applications of FAPI PET in Solid Tumors

August 17, 2026 updated by: Ruijin Hospital

Clinical Applications of Novel FAPI PET in Diverse Solid Tumors

The study systematically evaluates the diagnostic performance of FAPI-RuiJ and FAPI-04 PET/CT or PET/MR in various solid tumor types, and is expected to provide a novel molecular imaging tool for early lesion detection, accurate staging, and recurrence surveillance in patients with solid tumors.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

This prospective study is designed to evaluate and compare the PET/CT or PET/MR imaging characteristics of two fibroblast activation protein (FAP)-targeted tracers-the novel tracer FAPI-RuiJ and the reference tracer FAPI-04-across a diverse range of solid tumors. All enrolled patients will undergo paired PET imaging with both FAPI-RuiJ and FAPI-04. For each tracer, semi-quantitative uptake parameters (including SUVmax, SUVmean, SUVpeak, tumor-to-background ratio [TBR]）will be measured and compared. Biodistribution characteristics of FAPI-RuiJ in normal organs will be assessed to determine its in vivo metabolic profile. Using histopathology or imaging follow-up as the reference standard, the diagnostic performance of FAPI-RuiJ PET will be compared with that of FAPI-04 PET, with evaluation metrics including sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV), accuracy, and area under the receiver operating characteristic curve (AUC). Correlation analyses will be performed between PET parameters and clinicopathological characteristics, including tumor markers, pathological subtype, and immunohistochemical markers.The study is expected to provide a novel molecular imaging tool to support early lesion detection, accurate staging, and recurrence surveillance in patients with solid tumors.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
200

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • China
      • Shanghai, China
        • Recruiting
        • Ruijin Hospital, Shanghai Jiao Tong University School of Medicine
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  1. Age ≥ 18 years and ≤ 80 years, regardless of gender.
  2. Participants with suspected, confirmed, or suspected recurrent solid tumors.
  3. Participants who agree to participate in this clinical trial and provide written informed consent.
  4. Participants with good compliance, who commit to adhering to the study procedures and cooperate with the full study process.
  5. No plans for pregnancy within 6 months.

Exclusion Criteria:

  1. Patients with severe medical conditions that, in the investigator's opinion, make them unsuitable for participation in this clinical study, including but not limited to: severe cardiopulmonary insufficiency, severe bone marrow suppression, and severe hepatic or renal insufficiency.
  2. Patients with claustrophobia, severe psychiatric symptoms, or impaired consciousness that precludes cooperation with the examination procedures.
  3. Patients who have received any anti-tumor therapy during the interval between the two PET imaging sessions.
  4. Pregnant or breastfeeding women.
  5. Patients with poor compliance.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Diagnostic
  • Allocation: Randomized
  • Interventional Model: Crossover Assignment
  • Masking: Double

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Participants will undergo FAPI-RuiJ PET/CT or PET/MR, followed by FAPI-04 imaging on a separate day
Participants will undergo paired PET/CT or PET/MR imaging sequentially, with FAPI-RuiJ administered first and FAPI-04 on a separate day (interval: 1-7 days). For each tracer, a single intravenous injection will be given, followed by whole-body image acquisition at a standardized post-injection time. All images will be independently reviewed by two blinded nuclear medicine physicians. Histopathology or imaging follow-up serves as the reference standard.
Diagnostic test: FAPI-RuiJ
A novel FAP-targeted radiotracer for PET/CT or PET/MR imaging; administered intravenously.
Diagnostic test: FAPI-04
A FAP-targeted radiotracer for PET/CT or PET/MR imaging; administered intravenously.
Experimental: Participants will undergo FAPI-04 PET/CT or PET/MR, followed by FAPI-RuiJ imaging on a separate day
Participants will undergo paired PET/CT or PET/MR imaging sequentially, with FAPI-04 administered first and FAPI-RuiJ on a separate day (interval: 1-7 days). For each tracer, a single intravenous injection will be given, followed by whole-body image acquisition at a standardized post-injection time. All images will be independently reviewed by two blinded nuclear medicine physicians. Histopathology or imaging follow-up serves as the reference standard.
Diagnostic test: FAPI-RuiJ
A novel FAP-targeted radiotracer for PET/CT or PET/MR imaging; administered intravenously.
Diagnostic test: FAPI-04
A FAP-targeted radiotracer for PET/CT or PET/MR imaging; administered intravenously.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Diagnostic sensitivity, specificity, PPV, NPV, and accuracy of FAPI-RuiJ PET versus FAPI-04 PET
Time Frame: Through study completion, an average of 3 years
Overall and tumor type-specific diagnostic performance in solid tumors, using histopathology or imaging follow-up as the reference standard.
Through study completion, an average of 3 years
AUC of FAPI-RuiJ PET versus FAPI-04 PET
Time Frame: Through study completion, an average of 3 years
Overall and tumor type-specific AUC comparison between the two tracers in solid tumors, using histopathology or imaging follow-up as the reference standard.
Through study completion, an average of 3 years

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Comparison of SUVmax, SUVmean, and SUVpeak of FAPI-RuiJ PET versus FAPI-04 PET in solid tumor lesions
Time Frame: At the time of PET/CT scan
Semi-quantitative comparison of standardized uptake value (SUV) parameters (SUVmax, SUVmean, and SUVpeak) between the two tracers in solid tumor lesions.
At the time of PET/CT scan
Comparison of TBR of FAPI-RuiJ PET versus FAPI-04 PET in solid tumor lesions
Time Frame: At the time of PET/CT scan
Semi-quantitative comparison of TBR between the two tracers in solid tumor lesions. TBR is calculated as the ratio of tumor SUVmax to background SUVmean.
At the time of PET/CT scan
Biodistribution characteristics of FAPI-RuiJ PET in normal organs
Time Frame: At the time of PET/CT scan
Quantitative assessment of FAPI-RuiJ tracer biodistribution in major normal organs (including brain, submandibular gland, thyroid, lung, descending aorta, heart, liver, pancreas, stomach, spleen, kidney, bone, muscle, small intestine, gallbladder) measured by SUVmean and SUVmax on PET/CT images using ROI-based analysis.
At the time of PET/CT scan
Correlation between FAPI-RuiJ PET semi-quantitative parameters and clinicopathological characteristics in solid tumors
Time Frame: Through study completion, an average of 3 years
Correlation analysis between FAPI-RuiJ PET semi-quantitative uptake parameters (including SUVmax, SUVmean, SUVpeak, TBR and clinicopathological characteristics, including tumor markers (e.g., CEA, CA19-9, AFP, etc.), pathological subtype, and immunohistochemical markers (e.g., Ki-67, PD-L1, EGFR, etc.). Correlations will be assessed using Spearman's rank correlation coefficient (ρ), with statistical significance set at p < 0.05.
Through study completion, an average of 3 years

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Ruijin Hospital

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Biao Li, Ruijin Hospital

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
July 2, 2026

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
March 31, 2029

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
March 31, 2029

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
July 26, 2026

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 17, 2026

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
August 20, 2026

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
August 20, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 17, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
April 1, 2026

More Information

Terms related to this study

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 2026 CER 311

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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