Letermovir for R+ Study (MISP CMV)

July 9, 2026 updated by: University of Wisconsin, Madison

An Interventional Study of Letermovir for Primary Prophylaxis of Cytomegalovirus Infection in Moderate Risk (R+) Abdominal Solid Organ Transplant Recipients

The purpose of this clinical trial is to find out whether a medication, called letermovir, can help prevent a virus called cytomegalovirus (CMV) in participants who receive a kidney or liver transplant and who have already been exposed the CMV.

Participants will take letermovir for 84 days.

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Detailed Description

This study is being done to see if letermovir prevents CMV reactivation in seropositive participants with a kidney or liver transplant.

Study Type

Interventional

Enrollment (Estimated)

146

Phase

  • Phase 4

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 Backup

Study Locations

  • United States
    • Wisconsin
      • Madison, Wisconsin, United States, 53792
        • University of Wisconsin - Madison

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:

  • Adults who are at moderate risk for CMV after transplant (CMV IGG+, including D+/R+ or D-/R+)
  • Adults who received a kidney transplant, liver transplant, or any combination thereof

Exclusion Criteria:

  • Known contraindication to letermovir or its excipients
  • Current participation in another CMV related study
  • Unwilling or unable to participate in the study protocol

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

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Receive letermovir
Participants will take letermovir
Drug: Letermovir
1 tablet by mouth, once daily, for 84 days

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Efficacy of letermovir as a prophylaxis of CMV
Time Frame: 84 days
Efficacy will be measured through comparative rates of antiviral failure. Failure will be defined as withdrawal due to intolerance or breakthrough viral replication to a viral load >1000 IU/mL.
84 days

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Percentage of participants who develop cytomegalovirus-specific cell-mediated immunity
Time Frame: 84 days
To be measured using the Eurofins-Viracor CMV inSIGHT™ T Cell Immunity testing. The test measures the strength of T cell responses to Cytomegalovirus (CMV) specific antigens.
84 days

Collaborators and Investigators

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

Sponsor

University of Wisconsin, Madison

Collaborators

Merck Sharp & Dohme LLC

Investigators

  • Principal Investigator: David Al-Adra, MD, University of Wisconsin, Madison

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 (Estimated)

August 1, 2026

Primary Completion (Estimated)

August 1, 2029

Study Completion (Estimated)

August 1, 2029

Study Registration Dates

First Submitted

July 9, 2026

First Submitted That Met QC Criteria

July 9, 2026

First Posted (Actual)

July 15, 2026

Study Record Updates

Last Update Posted (Actual)

July 15, 2026

Last Update Submitted That Met QC Criteria

July 9, 2026

Last Verified

July 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 2026-0529
  • UWMSN | SMPH | Surgery - Trans (Other Identifier: UW Madison)
  • Protocol Version 3/12/26 (Other Identifier: UW Madison)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

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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