Real-world Treatment Outcomes and Safety of Neoadjuvant Pembrolizumab-containing Therapy in Patients With Triple-negative Breast Cancer: Korean Nationwide Multicenter Study (Pembro-Real World)

September 15, 2026 updated by: Yeon Hee Park
The purpose of this study is to evaluate the treatment outcomes and safety of neoadjuvant therapy including pembrolizumab in real-world practice for patients with triple-negative breast cancer (TNBC) in a multi-center study in Korea. In particular, we aim to evaluate the treatment efficacy focusing on the pathologic complete response (pCR) and analyze the association with recurrence rates and survival indicators.

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Detailed Description

There is a need for research analyzing treatment response, long-term clinical outcomes, and the patterns of short- and long-term immune-related adverse events in TNBC patients who have received neoadjuvant chemotherapy including pembrolizumab in a real-world clinical setting. This study aims to provide real-world evidence by comprehensively analyzing pathological response, recurrence patterns, survival outcomes, and treatment-related adverse events in TNBC patients who received pembrolizumab-based neoadjuvant chemotherapy in actual clinical practice. These findings are expected to provide important evidence for validating clinical trial results in real-world clinical settings and optimizing future treatment strategies for TNBC patients.

Study Type

Observational

Enrollment (Estimated)

2000

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

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

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Sampling Method

Non-Probability Sample

Study Population

about 2000 population with TNBC

Description

Inclusion Criteria:

  • Age of 19 years or older at the start of treatment

    • Patients diagnosed with triple-negative breast cancer (TNBC) pathologically

      • Patients diagnosed with clinical stage II or III ④ Patients who started neoadjuvant chemotherapy including pembrolizumab, paclitaxel, carboplatin, doxorubicin, and cyclophosphamide as preoperative neoadjuvant chemotherapy after July 2022

Exclusion Criteria:

  • History of other invasive malignancies, either concurrently or in the past (except for cancers where at least 5 years have passed since completion of treatment and there has been no recurrence) ② Patients diagnosed with clinical stage II or III who have a history of previous diagnosis and treatment for invasive breast cancer and have experienced local recurrence

    • Patients who have not started pembrolizumab treatment concurrently with chemotherapy ④ Cases where assessment of pathological response is impossible due to the absence of surgery

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

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
primary purpose
Time Frame: until 2027.12.31
Evaluate pathologic complete response, pCR,ypT0N0
until 2027.12.31

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Outcome Measure
Time Frame: until 2027.12.31
Analysis of overall survival (OS), in real-world practice of neoadjuvant therapy including pembrolizumab in patients with triple-negative breast cancer (TNBC)
until 2027.12.31

Other Outcome Measures

Outcome Measure
Measure Description
Time Frame
Other Outcome Measure
Time Frame: Until 2027.12.31
Analysis of event-free survival in real-world practice of neoadjuvant therapy including pembrolizumab in patients with triple-negative breast cancer (TNBC)
Until 2027.12.31
Other Outcome Measure
Time Frame: until 2027.12.31
Analysis of adverse events, etc., in real-world practice of neoadjuvant therapy including pembrolizumab in patients with triple-negative breast cancer (TNBC)
until 2027.12.31

Collaborators and Investigators

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

Sponsor

Yeon Hee Park

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)

September 14, 2026

Primary Completion (Estimated)

December 31, 2027

Study Completion (Estimated)

December 31, 2027

Study Registration Dates

First Submitted

September 2, 2026

First Submitted That Met QC Criteria

September 15, 2026

First Posted (Actual)

September 18, 2026

Study Record Updates

Last Update Posted (Actual)

September 18, 2026

Last Update Submitted That Met QC Criteria

September 15, 2026

Last Verified

September 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 2026-08-063

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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