Metformin in Pseudomyxoma Peritonei Secondary to Appendiceal Mucinous Neoplasms

July 3, 2026 updated by: Oliver Eng, University of California, Irvine

Use of Metformin in Patients With Pseudomyxoma Peritonei Secondary to Appendiceal Mucinous Neoplasms

This is a pilot, open-label clinical trial determining the feasibility of metformin therapy in subjects with pseudomyxoma peritoneal (PMP) secondary to appendiceal mucinous neoplasms (AMNs).

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Detailed Description

This is a single-arm, prospective pilot/feasibility study. Treatment will continue for the duration of the study (18 months) or intolerance to treatment. The primary endpoint will be feasibility of metformin therapy in patients with PMP secondary to AMNs.

Study Type

Interventional

Enrollment (Estimated)

15

Phase

  • Phase 2

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

  • Name: Chao Family Comprehensive Cancer Center University of California, Irvine
  • Phone Number: 1-877-827-8839
  • Email: ucstudy@uci.edu

Study Contact Backup

  • Name: University of California Irvine Medical

Study Locations

  • United States
    • California
      • Orange, California, United States, 92868
        • Recruiting
        • Chao Family Comprehensive Cancer Center, University of California, Irvine
        • 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

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Key Inclusion Criteria (complete details available in protocol):

  • Patients with clinical diagnosis of PMP secondary to presumed AMNs with recurrent/refractory disease s/p CRS/HIPEC, unresectable disease, or without planned CRS/HIPEC
  • Age ≥18 years
  • ECOG performance status ≤2

Key Exclusion Criteria (complete details available in protocol):

  • Patients with a clinical diagnosis of PMP secondary to presumed AMNs with resectable disease who are planned to undergo CRS/HIPEC
  • Patients currently taking metformin for another medical indication
  • Patients with a prior adverse event to administration of metformin

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

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Metformin Treatment
850mg PO daily
Drug: Metformin
Given PO

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Proportion of Participants who have completed at least (≥) 80% of planned metformin doses by 6 months
Time Frame: 6 months
Examine the feasibility of metformin therapy in patients with PMP secondary to AMNs
6 months

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Progression Free Survival (PFS)
Time Frame: 6, 12 and 18 months
Examine efficacy of metformin therapy in patients with PMP secondary to AMNs as assessed by progression free survival (PFS). Progression free survival will be defined by relative best tumor size change from baseline ranging from -100% to 100%, with radiographic findings assessed via modified peritoneal RECIST criteria at 6/12/18 months.
6, 12 and 18 months

Collaborators and Investigators

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

Sponsor

University of California, Irvine

Investigators

  • Principal Investigator: Oliver Eng, MD, Chao Family Comprehensive Cancer Center

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 18, 2026

Primary Completion (Estimated)

February 1, 2028

Study Completion (Estimated)

July 1, 2029

Study Registration Dates

First Submitted

July 3, 2026

First Submitted That Met QC Criteria

July 3, 2026

First Posted (Actual)

July 9, 2026

Study Record Updates

Last Update Posted (Actual)

July 9, 2026

Last Update Submitted That Met QC Criteria

July 3, 2026

Last Verified

July 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • STUDY00000747
  • UCI 25-149 (Other Identifier: UCI CFCCC)

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

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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