Keynote 355

For patients with locally recurrent, inoperable or metastatic triple negative breast cancer

Study of Pembrolizumab Plus Chemotherapy vs. Placebo Plus Chemotherapy for Previously Untreated Locally Recurrent Inoperable or Metastatic Triple Negative Breast Cancer

The study will consist of two parts. In Part 1, the safety of pembrolizumab (MK-3475) in combination with one of three different chemotherapies will be assessed in the treatment of locally recurrent inoperable or metastatic triple negative breast cancer (TNBC), which has not been previously treated with chemotherapy. In Part 2, the safety and efficacy of pembrolizumab plus chemotherapy will be assessed compared to the safety and efficacy of placebo plus chemotherapy in the treatment of locally recurrent inoperable or metastatic TNBC, which has not been previously treated with chemotherapy. The primary hypotheses are that the combination of pembrolizumab and chemotherapy prolongs Progression-Free Survival (PFS) compared to placebo and chemotherapy in all participants and in participants with programmed cell death ligand 1 (PD-L1) positive tumors, and prolongs Overall Survival (OS) compared to placebo and chemotherapy in all participants and in participants with PD-L1 positive tumors.

Status:

Active, not recruiting

Phase 3 Icon

Trial Phase

The investigational immunotherapy is being studied in a large group of patients to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the investigational immunotherapy to be used safely.

Eligibility

About the Trial

All patients who enroll in the trial will receive medication while on the study.

  • 67% will receive pembrolizumab along with chemotherapy
  • 33% will receive placebo along with chemotherapy

You will be assigned by chance (a process called randomization) to receive one of the above treatments. Please note the above information relates to Part 2 of the study.

Trial Purpose
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US Trial Locations

Clinical trial sites are places such as hospitals or clinics where the trial is being conducted.

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National Trial Reference Number

NCT02819518 Read More at clinicaltrials.gov

What Can You Do Next?

If you would like to learn about this clinical trial or see if you can participate, you can:

Contact Our Trial Info Center

To learn more, call 1-888-577-8839

Discuss With Your Doctor

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Tip: To help with understanding of some clinical terms used on the page, select an underlined term to see what they mean.

Eligibility

Only a qualified healthcare professional can determine your eligibility. However, this information may be useful in starting a conversation with your doctor.

Condition

The disease, disorder, syndrome, illness, or injury that is being studied. Conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.
Triple Negative Breast Cancer (TNBC)

Age range

18 — no age maximum

Gender(s)

All

Trial Purpose

The study will consist of two parts. In Part 1, the safety of pembrolizumab (MK-3475) in combination with one of three different chemotherapies will be assessed in the treatment of locally recurrent inoperable or metastatic triple negative breast cancer (TNBC), which has not been previously treated with chemotherapy. In Part 2, the safety and efficacy of pembrolizumab plus chemotherapy will be assessed compared to the safety and efficacy of placebo plus chemotherapy in the treatment of locally recurrent inoperable or metastatic TNBC, which has not been previously treated with chemotherapy. The primary hypotheses are that the combination of pembrolizumab and chemotherapy prolongs Progression-Free Survival (PFS) compared to placebo and chemotherapy in all participants and in participants with programmed cell death ligand 1 (PD-L1) positive tumors, and prolongs Overall Survival (OS) compared to placebo and chemotherapy in all participants and in participants with PD-L1 positive tumors.

Important information

Participating in a clinical trial is an important decision. Anyone participating in a trial should know as much as possible about what is being studied, what risks are involved and what potential benefits may be gained before deciding to enroll. If you are interested in participating in a clinical trial, please talk to your doctor first.

How to Learn More

When speaking to your doctor, please have the trial reference number available. You can also call 1-888-577-8839 for more information.

Print or email this page.

Trial reference number

A unique identification code given to each clinical trial registered on clinicaltrials.gov.

Keynote number

A unique identification code used by the sponsor to identify a specific trial.
Keynote-355

Official title

A description of the clinical trial that the trial sponsor and clinicians use to identify a specific trial and its purpose.
A Randomized, Double-Blind, Phase III Study of Pembrolizumab (MK-3475) Plus Chemotherapy vs Placebo Plus Chemotherapy for Previously Untreated Locally Recurrent Inoperable or Metastatic Triple Negative Breast Cancer - (KEYNOTE-355)
keynote 355 trial logo

Call 1-888-577-8839 to contact our trial information center

Clinical Trials: Important Information to Consider

There is a lot to consider when deciding whether to participate in a clinical study. Any clinical study includes risks, which the study doctor will review with you. Make sure you understand the risks before participating.