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CAR-T therapy may erase vaccine immunity, new study warns

NCT ID NCT06784167

Knowledge-focused Sponsor: OHSU Knight Cancer Institute Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 24, 2026 · Last updated Jun 26, 2026 · Updated 2 times

Summary

This study looks at whether CAR-T cell therapy reduces the body's ability to fight off diseases like measles and mumps that were previously prevented by vaccines. Researchers will measure antibody levels in 45 adults with multiple myeloma or non-Hodgkin lymphoma before and after CAR-T treatment. The goal is to understand if patients need to be revaccinated after this type of cancer therapy.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

What this could lead to
If successful, this study could help doctors understand whether blood cancer patients need revaccination after CAR-T therapy.
What could go wrong
This is a small, observational study (45 people) that only measures immune markers, not health outcomes. Results may not apply to all patients or vaccines.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Participants

About 45 people

The number the study aims to enrol. It can still change while the study runs.

Started

Mar 2025

Expected to finish

Apr 2027

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

Patients with multiple myeloma and non-hodgkin lymphoma recruited through OHSU Knight Cancer Institute

Ages

18 years and older

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * \* Willingness to provide written informed consent before any study-specific procedures or activities are performed * Age ≥ 18 years of age, at the time of consent * Documented, histologically or cytologically confirmed diagnosis of multiple myeloma (MM), diffuse large B cell lymphoma (DLBCL),follicular lymphoma (FL), mantle cell lymphoma (MCL), chronic lymphocytic leukemia (CLL), or small lymphocytic lymphoma (SLL), or primary mediastinal B cell lymphoma (PMBL). All number of prior lines of therapy are allowed * History of prior vaccination against common VPD * Approved by managing physician for CAR-T therapy, with preparative conditioning planned within the next 90 days * Approved by managing physician for revaccination against Streptococcus pneumoniae or tetanus Exclusion Criteria: * \* Ongoing use of immunosuppressive agents or plans for immunosuppressive therapy that would interfere with interpretation of study endpoints * Uncontrolled, intercurrent illness including, but not limited to, systemic infection, symptomatic congestive heart failure, unstable angina pectoris, or psychiatric illness/social situations that would limit compliance with study requirements or make the study procedures unadvisable

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Conditions

The condition(s) this trial relates to.

B-cell chronic lymphocytic leukemia diffuse large B-cell lymphoma follicular lymphoma mantle cell lymphoma plasma cell myeloma primary mediastinal large B-cell lymphoma

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Chronic lymphocytic leukemia Diffuse large B-cell lymphoma Follicular lymphoma Mantle cell lymphoma Multiple myeloma Primary mediastinal large B cell lymphoma Small lymphocytic lymphoma

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • OHSU Knight Cancer Institute

    RECRUITING

    Portland, Oregon, 97239, United States

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