A Study to Evaluate the Human Biodistribution and Dosimetry of the Radionuclide Labeled IR199 in Patients With Gastric Cancer and Pancreatic Cancer

July 11, 2026 updated by: YiHui Guan, Huashan Hospital
This study is to evaluate the safety, biodistribution, radiation dosimetry and tumor uptake of the [68Ga]/ [131I]-IR199 in patients with Claudin 18.2 positive gastric cancer and pancreatic cancer.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

10

Phase

  • Early Phase 1

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 Locations

  • China
      • Shanghai, China
        • Recruiting
        • Huashan Hospital
        • Contact:
        • Principal Investigator:
          • Zhongguang Luo, MD

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

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  1. Informed consent must be obtained in writing from the subject, their legally authorized representative, or caregiver.
  2. Age equal to or above 18 years old.
  3. Histologically or cytologically confirmed gastric cancer or pancreatic cancer with Claudin 18.2 expression.
  4. Must have ≥1 Claudin 18.2 positive lesions.

Exclusion Criteria:

  1. Less than two weeks since the last treatment that could cause bone marrow suppression.
  2. Known or suspected history of ≥3 grade renal and urinary system diseases.
  3. Medical history of allergy, hypersensitivity reaction or intolerance to radioactive drugs.

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: Other
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: [68Ga]/ [131I]-IR199, single dose
Drug: [68Ga]/ [131I]-IR199
[68Ga]/ [131I]-IR199, single dose

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Absorbed radiation dose (Gy) distribution in normal organs and tumors by quantitative SPECT/CT dosimetry
Time Frame: about 24 hours from time of injection, about 48 hours from time of injection and about 72 hours from time of injection
Absorbed radiation dose (Gy) distribution in normal organs and tumors by quantitative SPECT/CT dosimetry
about 24 hours from time of injection, about 48 hours from time of injection and about 72 hours from time of injection

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Safety Assessment
Time Frame: From administration of [68Ga]/ [131I]-IR199 until 1 week after injection
Incidence and severity of adverse events (AEs) as assessed by CTCAE v6.0
From administration of [68Ga]/ [131I]-IR199 until 1 week after injection

Collaborators and Investigators

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

Sponsor

Huashan 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)

June 1, 2026

Primary Completion (Estimated)

April 30, 2027

Study Completion (Estimated)

May 31, 2027

Study Registration Dates

First Submitted

June 29, 2026

First Submitted That Met QC Criteria

July 11, 2026

First Posted (Actual)

July 16, 2026

Study Record Updates

Last Update Posted (Actual)

July 16, 2026

Last Update Submitted That Met QC Criteria

July 11, 2026

Last Verified

March 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • KY2026-054

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

UNDECIDED

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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