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NCT Number: NCT07219238

Study to Evaluate the Diagnostic Performance of GEH300079 (68Ga) Injection PET/CT for Detection of PC in Patients With Colorectal, Gastric, Ovarian, or Pancreatic Cancers (PERISCOPE)

This study is a Phase 2/3, prospective, multicenter, open-label, non-randomized clinical trial, in which GEH300079 (68Ga) PET/CT images will be acquired in patients with primary colorectal, gastric, ovarian, or Pancreatic Ductal Adenocarcinoma (PDAC) cancers and known or suspected Peritoneal Carcinomatosis (PC) before or after institutional Standard of Care (SoC) imaging. The primary objective is to evaluate the diagnostic performance of GEH300079 (68Ga) PET/CT for the detection of PC in patients with colorectal, gastric, or ovarian primary cancers, using a composite standard of truth (SoT), in a region-based analysis. The detection of PC in patients with primary PDAC will be explored in the Phase 2 part of the study.

The study is comprised of 2 distinct parts: Phase 2 aims to confirm the statistical and scientific assumptions for the Phase 3 part, and to confirm the optimal dose and timing of acquisition of GEH300079 (68Ga) PET/CT in the PC indication. Phase 2 includes 2 cohorts: Cohort A (participants with colorectal, ovarian and gastric primary cancer), and Cohort B (participants with primary PDAC), where analysis of Cohort B is descriptive only. Phase 3 aims to demonstrate the safety and efficacy of GEH300079 (68Ga) PET/CT for the detection of PC in patients with confirmed colorectal, gastric or ovarian primary cancers.

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Key information

Conditions

Colorectal Cancer Abdominal Neoplasms Adnexal Diseases Colonic Diseases Colorectal Neoplasms Digestive System Diseases Digestive System Neoplasms Endocrine Gland Neoplasms Endocrine System Diseases Female Urogenital Diseases Female Urogenital Diseases and Pregnancy Complications Gastric Cancers Gastrointestinal Diseases Gastrointestinal Neoplasms Genital Diseases Genital Diseases, Female Genital Neoplasms, Female Gonadal Disorders Intestinal Diseases Intestinal Neoplasms Neoplasms Neoplasms by Site Ovarian Cancers Ovarian Diseases Ovarian Neoplasms Pancreatic Diseases Pancreatic Ductal Adenocarcinoma Pancreatic Neoplasms Peritoneal Diseases Peritoneal Neoplasms Rectal Diseases Stomach Diseases Stomach Neoplasms Urogenital Diseases Urogenital Neoplasms

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 2 / Phase 3

Primary location

Karolinska Universitetssjukhuset, Stockholm, Sweden

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Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Participant is ≥18 years of age
  • Participant has provided signed informed consent before any study-specific screening procedures
  • Participant has histopathologically confirmed primary colorectal, gastric or ovarian cancer or PDAC
  • Participant has known or suspected PC from the tumor of origin. Suspicion may be based on imaging or clinical findings.
  • Participant is scheduled for peritoneal surgery with curative intent, surgical exploration, or laparoscopy, with either: a. No neoadjuvant treatment received, treatment-naïve (i.e., undergoing upfront surgery or laparoscopy) b. Completed systemic treatment (which may include neoadjuvant chemotherapy) before GEH300079 ( 68Ga) PET/CT Imaging Visit
  • Participant has Eastern Cooperative Oncology Group (ECOG) performance status ≤2
  • Participant is able and willing to comply with all study procedures as described in the protocol

Exclusion criteria

  • Participant is pregnant or breast-feeding, or sexually active and not using or not willing to use an acceptable form of birth control from screening up to 30 days after receiving the investigational medicinal product (IMP)
  • Participant has a known disorder that, in the opinion of the investigator, will impact the study procedures
  • Participant needs any intervention that would delay study participation
  • Participant has non-resectable extra-abdominal metastasis and/or >3 hepatic metastases on standard work up
  • Participant will not be able to complete the study, based on their anticipated life expectancy
  • Participant has active bacterial, viral, or fungal infection requiring systemic antibacterial, anti-viral or antifungal therapy (topical medications are permitted)
  • Participant has renal function impairment as defined by:
  • For Phase 2: estimated glomerular filtration rate less than 60 mL/min
  • For Phase 3: estimated glomerular filtration rate less than 30 mL/min
  • Participant has severe hepatic function impairment as defined by:
  • Aspartate aminotransferase (serum glutamic-oxaloacetic transaminase) and alanine aminotransferase (serum glutamic-pyruvic transaminase): ≤2.5 × upper limit of normal (ULN; ≤5 × ULN for participants with liver metastases)
  • Bilirubin: ≤1.5 × ULN or direct bilirubin ≤ULN for participants with total bilirubin levels >1.5 × ULN
  • Participant has autoimmune disease that required systemic treatment in the past 2 years. Replacement therapy (e.g., thyroxine, insulin, or physiologic corticosteroid) is allowed
  • Participant has serious co-morbidities or serious non-malignant disease that in the opinion of the investigator, could compromise participant safety and/or protocol objectives
  • Participant either received or is planning to receive any other investigational agent within the 28 days prior to the first imaging visit or during study participation (with the exception of the 3-month follow-up period)
  • Participant has known or suspected hypersensitivity to any excipients used in GEH300079 (68Ga)
  • Participant has severe claustrophobia, is unable to lie flat or fit into the scanner, or is unable to tolerate the PET/CT scan for any reason
  • (Phase 3 only) Participant was previously included in Phase 2 of this study

Treatment and study plan

GEH300079 (68Ga) Injection Positron-Emission Tomography (PET)/Computed Tomography (CT)

Drug

Attenuation correction CT will commence after the administration of GEH300079 (68Ga), and immediately before the PET acquisition. The PET acquisition will encompass the participant's vertex through mid-thighs. Images will be acquired at 60 ±5 minutes post injection, with a scan duration of approximately 20 to 30 minutes.

Primary outcomes

  1. Per-region sensitivity and Per-region specificity of GEH300079 (68Ga) PET/CT imaging to detect PC.

    Time frame: Single time point. Images will be acquired at 60 minutes ±5 minutes post injection, with a scan duration of approximately 20 to 30 minutes.

    The co-primary efficacy endpoint is based on region level sensitivity and specificity of GEH300079 (68Ga) PET/CT imaging for the detection of PC in participants with colorectal, gastric or ovarian primary cancer. GEH300079 (68Ga) PET/CT images collected during the Phase 2 part will be reviewed by 5 independent readers. Images collected during the Phase 3 part will be reviewed by 3 readers. The superiority of per region sensitivity (respectively specificity) to a pre-specified threshold of 75% (respectively 70%) will be assessed using one-sided Z-tests. The co-primary endpoints will be considered as met if superiority of both per region sensitivity and per region specificity is achieved by at least 3 of the 5 readers in the Phase 2 part, and by at least 2 of the 3 readers in the Phase 3 part.

Secondary outcomes

  1. Superiority of the per region sensitivity of GEH300079 (68Ga) PET/CT to detect PC compared to baseline SoC imaging and non-inferiority of the per region specificity of GEH300079 (68Ga) PET/CT to detect PC compared to baseline SoC imaging.

    Time frame: Single time point. Baseline SoC images vs GEH300079 (68Ga) PET/CT Images acquired at 60 minutes ±5 minutes post injection, with a scan duration of approximately 20 to 30 minutes.

    Superiority of the per region sensitivity of GEH300079 (68Ga) PET/CT to detect PC compared to SoC imaging will be assessed on participants from the ITI using a McNemar test.

    Non-inferiority of the per region specificity of GEH300079 (68Ga) PET/CT to detect PC compared to SoC imaging, will be assessed using a restricted maximum likelihood estimate (RMLE) -based score test, with a non-inferiority margin of 10%.

    SoC images will be reviewed by 3 independent readers. The co-key secondary endpoints will be met if the co-primary endpoints are met and both co-key secondary endpoints are demonstrated for the same reader, for at least 2 of the 3 pairs of readers.

  2. Superiority of the per participant sensitivity of GEH300079 (68Ga) PET/CT to detect PC compared to baseline SoC imaging in Phase 3

    Time frame: Single time point. Baseline SoC images vs GEH300079 (68Ga) PET/CT Images acquired at 60 minutes ±5 minutes post injection, with a scan duration of approximately 20 to 30 minutes.

    Superiority of the per participant sensitivity of GEH300079 (68Ga) PET/CT to detect PC compared to baseline SoC imaging will be assessed using a McNemar test, in the Phase 3 part.

  3. Per region PPV, NPV, and accuracy and per participant sensitivity, specificity PPV, NPV, and accuracy of GEH300079 (68Ga) PET/CT and baseline SoC imaging to detect PC

    Time frame: Single time point. Baseline SoC images vs GEH300079 (68Ga) PET/CT Images acquired at 60 minutes ±5 minutes post injection, with a scan duration of approximately 20 to 30 minutes.

    Per region PPV, NPV, and accuracy and per participant sensitivity, specificity PPV, NPV, and accuracy of GEH300079 (68Ga) PET/CT and baseline SoC imaging to detect PC will be tabulated.

  4. Correlation between radiological and surgical/laparoscopic PCI scores

    Time frame: Single time point. Baseline SoC images. GEH300079 (68Ga) PET/CT Images acquired at 60 minutes ±5 minutes post injection, with a scan duration of approximately 20 to 30 minutes. Surgery/laparoscopy within 28 days post injection

    Correlation between radiological PCI scores (based on GEH300079 (68Ga) PET/CT, CT, MR, [18F]FDG PET/CT) and surgical/laparoscopic PCI score.

  5. The number of Positive peritoneal regions and percentage of participants with a difference in the number of Positive peritoneal regions.

    Time frame: single time point. Baseline SoC images vs GEH300079 (68Ga) PET/CT Images acquired at 60 minutes ±5 minutes post injection, with a scan duration of approximately 20 to 30 minutes.

    The number of Positive peritoneal regions identified by GEH300079 (68Ga) PET/CT, CT, MR, and [18F]FDG PET/CT, and the percentage of participants with a difference in the number of Positive peritoneal regions identified by GEH300079 (68Ga) PET/CT and baseline SoC imaging.

  6. SUVmax of GEH300079 (68Ga) PET/CT in comparison with [18F]FDG PET/CT.

    Time frame: Single time point Baseline [18F]FDG PET/CT images vs GEH300079 (68Ga) PET/CT Images acquired at 60 minutes ±5 minutes post injection, with a scan duration of approximately 20 to 30 minutes.

    SUVmax of GEH300079 (68Ga) PET/CT for the largest lesion identified within each peritoneal region from different primary cancers in comparison with [18F]FDG PET/CT.

  7. SUVmean of GEH300079 (68Ga) PET/CT in comparison with [18F]FDG PET/CT.

    Time frame: Single time point Baseline [18F]FDG PET/CT images vs GEH300079 (68Ga) PET/CT Images acquired at 60 minutes ±5 minutes post injection, with a scan duration of approximately 20 to 30 minutes.

    SUVmean of GEH300079 (68Ga) PET/CT for the largest lesion identified within each peritoneal region from different primary cancers in comparison with [18F]FDG PET/CT.

  8. SUVpeak of GEH300079 (68Ga) PET/CT in comparison with [18F]FDG PET/CT.

    Time frame: Single time point Baseline [18F]FDG PET/CT images vs GEH300079 (68Ga) PET/CT Images acquired at 60 minutes ±5 minutes post injection, with a scan duration of approximately 20 to 30 minutes.

    SUVpeak of GEH300079 (68Ga) PET/CT for the largest lesion identified within each peritoneal region from different primary cancers in comparison with [18F]FDG PET/CT.

  9. Tumor to-background ratio (TBR) of GEH300079 (68Ga) PET/CT in comparison with [18F]FDG PET/CT.

    Time frame: Single time point Baseline [18F]FDG PET/CT images vs GEH300079 (68Ga) PET/CT Images acquired at 60 minutes ±5 minutes post injection, with a scan duration of approximately 20 to 30 minutes.

    TBR of GEH300079 (68Ga) PET/CT for the largest lesion identified within each peritoneal region from different primary cancers in comparison with [18F]FDG PET/CT.

  10. Contrast-to-noise ratio (CNR) of GEH300079 (68Ga) PET/CT in comparison with [18F]FDG PET/CT.

    Time frame: Single time point Baseline [18F]FDG PET/CT images vs GEH300079 (68Ga) PET/CT Images acquired at 60 minutes ±5 minutes post injection, with a scan duration of approximately 20 to 30 minutes.

    CNR of GEH300079 (68Ga) PET/CT for the largest lesion identified within each peritoneal region from different primary cancers in comparison with [18F]FDG PET/CT.

  11. Correlation between FAP expression and GEH300079 (68Ga) PET/CT uptake in PC from different primary cancer in Phase 2

    Time frame: Single time point GEH300079 (68Ga) PET/CT Images acquired at 60 minutes ±5 minutes post injection, with a scan duration of approximately 20 to 30 minutes. Surgery/laparoscopy within 28 days post injection

    The correlation between GEH300079 (68Ga) PET/CT uptake in PC from different primary cancers and FAP expression measured by IHC in Phase 2.

  12. Percentage of participants for whom GEH300079 (68Ga) PET/CT could have led to a change in treatment plan

    Time frame: Single time point GEH300079 (68Ga) PET/CT Images acquired at 60 minutes ±5 minutes post injection

  13. Percentage of locoregional to systemic (M0 to M1) upstaging induced by GEH300079 (68Ga) PET/CT

    Time frame: Single time point GEH300079 (68Ga) PET/CT Images acquired at 60 minutes ±5 minutes post injection

  14. GEH300079 (68Ga) PET/CT image quality at 15 ±5 minutes, 60 ±5 minutes, and 3 hour ±10 minutes post-injection, as well as for different simulated injected activities.

    Time frame: GEH300079 (68Ga) PET/CT Images acquired at 15 ±5 minutes, 60 ±5 minutes, and 3 hour ±10 minutes post-injection

    Visual assessment score of overall image quality at 15 ±5 minutes, 60 ±5 minutes, and 3 hours ±10 minutes post-injection, and across different simulated injected activities

  15. Tumor to-background ratio (TBR) of GEH300079 (68Ga) PET/CT at 15 ±5 minutes, 60 ±5 minutes, and 3 hour ±10 minutes post-injection, as well as for different simulated injected activities

    Time frame: GEH300079 (68Ga) PET/CT Images acquired at 15 ±5 minutes, 60 ±5 minutes, and 3 hour ±10 minutes post-injection

    TBR for each GEH300079 (68Ga) PET/CT time point and each simulated injected activity

  16. Contrast-to-noise ratio (CNR) of GEH300079 (68Ga) PET/CT TBR at 15 ±5 minutes, 60 ±5 minutes, and 3 hour ±10 minutes post-injection, as well as for different simulated injected activities.

    Time frame: GEH300079 (68Ga) PET/CT Images acquired at 15 ±5 minutes, 60 ±5 minutes, and 3 hour ±10 minutes post-injection

    CNR for each GEH300079 (68Ga) PET/CT time point and each simulated injected activity

  17. Number of lesions detected by GEH300079 (68Ga) PET/CT at 15 ±5 minutes, 60 ±5 minutes, and 3 hour ±10 minutes post-injection, as well as for different simulated injected activities.

    Time frame: GEH300079 (68Ga) PET/CT Images acquired at 15 ±5 minutes, 60 ±5 minutes, and 3 hour ±10 minutes post-injection

    Count of lesions (<2 cm, ≥2 cm) for each GEH300079 (68Ga) PET/CT time point and each simulated injected activity

  18. Size of lesions detected by GEH300079 (68Ga) PET/CT at 15 ±5 minutes, 60 ±5 minutes, and 3 hour ±10 minutes post-injection, as well as for different simulated injected activities.

    Time frame: GEH300079 (68Ga) PET/CT Images acquired at 15 ±5 minutes, 60 ±5 minutes, and 3 hour ±10 minutes post-injection

    Size of lesions for each GEH300079 (68Ga) PET/CT time point and each simulated injected activity

  19. Coefficient of Variation (CV) of GEH300079 (68Ga) PET/CT SUV in Background and Reference Tissues at 15 ±5 minutes, 60 ±5 minutes, and 3 hour ±10 minutes post-injection, as well as for different simulated injected activities.

    Time frame: GEH300079 (68Ga) PET/CT Images acquired at 15 ±5 minutes, 60 ±5 minutes, and 3 hour ±10 minutes post-injection

    Variation coefficient of SUV in local background and reference tissues for each GEH300079 (68Ga) PET/CT time point and each simulated injected activity

  20. Intra-reader reproducibility for GEH300079 (68Ga) PET/CT

    Time frame: Single time point GEH300079 (68Ga) PET/CT Images acquired at 60 minutes ±5 minutes post injection

    Cohen's kappa statistics with 95% CI for read vs re-read, for each of the readers.

  21. Inter-reader agreement for GEH300079 (68Ga) PET/CT

    Time frame: Single time point GEH300079 (68Ga) PET/CT Images acquired at 60 minutes ±5 minutes post injection

    Cohen's kappa statistics with 95% CI for the assessment of agreement between 2 readers. Fleiss's kappa statistics with 95% CI will be provided for the assessment across the readers.

Study contacts

Contact information is provided by the study sponsor or research team.

Christopher Buckley

CONTACT

[email protected]

+ 44 7786 701174

Michelle Straszacker

CONTACT

[email protected]

+44 7827 845147

Sponsors and collaborators

Lead sponsor

GE Healthcare

Industry

Collaborators

  • Fortrea

Registry information

Official study title

A Phase 2/3, Multicenter, Open-Label, Non-Randomized Study to Evaluate Diagnostic Performance of GEH300079 (68Ga) Injection Positron-Emission Tomography (PET)/Computed Tomography (CT) for Detection of Peritoneal Carcinomatosis (PC) in Patients With Colorectal, Gastric, Ovarian, or Pancreatic Cancers (PERISCOPE)

Important dates

Study start
2026
Primary completion
2029
Study completion
2029
First posted
Oct 21, 2025
Registry last updated
Jun 17, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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