A Study to Assess Concentration of TREMFYA in Breast Milk of Lactating Women Who Are Receiving TREMFYA Therapeutically

June 12, 2026 updated by: Janssen Research & Development, LLC

CNTO1959ISD4001: A Phase 4, Open-Label, Milk-Only Lactation Study to Assess Concentration of TREMFYA in Breast Milk of Lactating Women Who Are Receiving TREMFYA Therapeutically

The purpose of this post-marketing study is to assess the amount of guselkumab in breast milk of lactating women receiving guselkumab as part of their standard clinical care provided by their treating physician, for any of the approved indications.

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

10

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 Locations

  • United States
    • North Carolina
      • Chapel Hill, North Carolina, United States, 27599
        • University of North Carolina at Chapel Hill

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:

  • Has an active diagnosis of at least one approved indication for guselkumab (psoriasis, psoriatic arthritis [PsA], UC and CD) as confirmed by medical records
  • Be medically stable on the basis of medical history review performed at screening. Any abnormalities must be consistent with the underlying illness in the study population and this determination must be recorded in the participant's source documents and initialed by the investigator
  • Currently is on established guselkumab maintenance therapy, that is, has received at least 2 guselkumab subcutaneous (SC) maintenance doses before Day 1
  • Has made the decision to be treated with guselkumab and to breastfeed independently prior to the participant consenting to participate in this study
  • Must be at least 5 weeks postpartum on Day 1
  • Have well-established lactation; participant must be exclusively breastfeeding their infant(s) (or not providing more than 1 supplemental bottle of formula/day) when enrolled in the study
  • Must plan to continue breastfeeding throughout the duration of the study

Exclusion criteria

  • Has any current or previous illness that, in the opinion of the investigator, might confound the results of the study or that could prevent, limit, or confound the protocol specified assessments
  • Has history of drug or alcohol abuse according to the Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-V) criteria within 1 year before screening
  • Uses or has used an investigational drug (including investigational vaccines) or used an invasive investigational medical device within 1 month before enrolling in the study
  • Has received or plans to receive any live, attenuated vaccine within 12 weeks prior to administration of guselkumab. Non-live vaccines approved or authorized for emergency use (for example, Coronavirus disease-19 [COVID-19]) by local health authorities are allowed
  • Has a positive urine pregnancy test on Day 1

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: Non-Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Breast Milk Collection: Guselkumab Once Every 4 Weeks (Q4W) Regimen
Participants who have been on guselkumab maintenance therapy and received at least 2 maintenance doses of guselkumab Q4W for any of the approved indications: ulcerative colitis (UC) or Crohn's Disease (CD), will be enrolled. On Day 1 of the study, participants will receive their scheduled guselkumab maintenance dose of 200 mg every 4 weeks. A total of 4 breast milk samples will be collected. The total study duration per participant will be 8 weeks.
Procedure: Breast Milk Sample Collection
Breast milk samples will be collected as per the schedule specified in protocol.
Drug: Guselkumab
Guselkumab as prescribed by the participant's treating physician and obtained by the participant outside of the study per the treating physician's practice will be used.
Experimental: Breast Milk Collection: Guselkumab Once Every 8 Weeks (Q8W) Regimen
Participants who have been on guselkumab maintenance therapy and received at least 2 maintenance doses of guselkumab Q8W regimen for any of the approved indications: psoriasis, psoriatic arthritis (pSA) or UC or CD, will be enrolled. On Day 1 of the study, the participants will receive their scheduled guselkumab maintenance dose of 100 mg every 8 weeks. A total of 5 breast milk samples will be collected. The total study duration per participant will be 8 weeks.
Procedure: Breast Milk Sample Collection
Breast milk samples will be collected as per the schedule specified in protocol.
Drug: Guselkumab
Guselkumab as prescribed by the participant's treating physician and obtained by the participant outside of the study per the treating physician's practice will be used.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Guselkumab Concentrations at Steady State in Breast Milk (Q4W Maintenance Regimen)
Time Frame: Up to Day 29
Guselkumab concentration at steady state in the breast milk of lactating participants receiving guselkumab Q4W maintenance regimen will be reported.
Up to Day 29
Guselkumab Concentrations at Steady State in Breast Milk (Q8W Maintenance Regimen)
Time Frame: Up to Day 57
Guselkumab concentration at steady state in the breast milk of lactating participants receiving guselkumab Q8W maintenance regimen will be reported.
Up to Day 57
Estimated Daily Infant Dosage of Guselkumab Q4W Maintenance Regimen
Time Frame: Up to Day 29
The estimated daily infant dosage of guselkumab Q4W maintenance regimen will be reported.
Up to Day 29
Estimated Daily Infant Dosage of Guselkumab Q8W Maintenance Regimen
Time Frame: Up to Day 57
The estimated daily infant dosage of guselkumab Q8W maintenance regimen will be reported.
Up to Day 57

Collaborators and Investigators

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

Sponsor

Janssen Research & Development, LLC

Investigators

  • Study Director: Janssen Research & Development, LLC Clinical Trial, Janssen Research & Development, LLC

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)

June 15, 2026

Primary Completion (Estimated)

August 31, 2027

Study Completion (Estimated)

August 31, 2027

Study Registration Dates

First Submitted

June 12, 2026

First Submitted That Met QC Criteria

June 12, 2026

First Posted (Actual)

June 17, 2026

Study Record Updates

Last Update Posted (Actual)

June 17, 2026

Last Update Submitted That Met QC Criteria

June 12, 2026

Last Verified

June 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • CNTO1959ISD4001 (Other Identifier: Janssen Research & Development, LLC)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

The data sharing policy of Johnson & Johnson Innovative Medicine is available at www.innovativemedicine.jnj.com/our-innovation/clinical-trials/transparency. As noted on this site, requests for access to the study data can be submitted through Yale Open Data Access (YODA) Project site at yoda.yale.edu.

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

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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