Study of Pembrolizumab (MK-3475) Plus Chemotherapy vs. Placebo Plus Chemotherapy for Previously Untreated Locally Recurrent Inoperable or Metastatic Triple Negative Breast Cancer (MK-3475-355/KEYNOTE-355)

2016-06-30 21:08:26 | BioPortfolio


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.


Prior treatment with chemotherapy in the (neo)adjuvant setting is allowed. For such participants, the period between completion of treatment with curative intent (e.g., date of primary breast tumor surgery or date of last adjuvant chemotherapy administration, whichever occurred last) and first documented local or distant disease recurrence must be ≥6 months. Participants who received taxane, gemcitabine, or platinum agents in the (neo)adjuvant setting can be treated with same class anticancer drug (taxane, gemcitabine, or carboplatin, respectively), if ≥12 months have elapsed between completion of treatment with curative intent and the first documented local or distant disease recurrence.

Study Design

Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor), Primary Purpose: Treatment


Triple Negative Breast Cancer (TNBC)


Pembrolizumab, Nab-paclitaxel, Paclitaxel, Gemcitabine, Carboplatin, Normale Saline Solution


Not yet recruiting


Merck Sharp & Dohme Corp.

Results (where available)

View Results


Published on BioPortfolio: 2016-06-30T21:08:26-0400

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