Antineoplastic Agents

All Drugs and Chemicals

Pembrolizumab

Antineoplastic Agents, Immunological

Immune Checkpoint Inhibitors

MK-3475 (pembrolizumab) 200 mg flat dose every 21 days

MK-3475

Dung Le, MD

This study will be looking at whether MK-3475 (pembrolizumab) is effective (anti-tumor activity) and safe in patients with MSI (Microsatellite Unstable) negative cancer with a mutator phenotype.

Study of MK-3475 (Pembrolizumab) in Patients With Microsatellite Unstable (MSI) Tumors (Cohort D)

Phase 2 Study of MK-3475 (Pembrolizumab) in Patients With Microsatellite Unstable (MSI) Tumors

Objective Response Rate (ORR) is defined as the percentage of patients achieving a complete response (CR) or partial response (PR) based on RECIST 1.1 criteria. CR = disappearance of all target lesions, PR is =\>30% decrease in sum of diameters of target lesions.

OS will be measured from date of first dose until death or end of follow-up (OS will be censored on the date the subject was last known to be alive for subjects without documentation of death at the time of analysis). Estimation based on the Kaplan-Meier curve.

PFS is defined as the proportion of patients without disease progression (PD or relapse from CR) or death due to any cause at 6 months. Disease progression will be assessed using RECIST (version 1.1). Per RECIST 1.1 criteria, CR = disappearance of all target lesions, Partial Response (PR) is =\>30% decrease in sum of diameters of target lesions, Progressive Disease (PD) is \>20% increase in sum of diameters of target lesions, Stable Disease (SD) is \<30% decrease or \<20% increase in sum of diameters of target lesions.Estimation based on the Kaplan-Meier curve.

Disease Control Rate (DCR) is defined as the percentage of patients achieving a complete response (CR) or partial response (PR) or stable disease (SD) based on RECIST 1.1 criteria. CR = disappearance of all target lesions, PR is =\>30% decrease in sum of diameters of target lesions, progressive disease (PD) is \>20% increase in sum of diameters of target lesions, stable disease (SD) is \<30% decrease or \<20% increase in sum of diameters of target lesions.

When calculating the incidence of AEs, each adverse event (AE) (as defined by NCI CTCAE v4.03) will be counted only once for a given subject.

Merck Sharp & Dohme LLC

Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins

MK-3475 (pembrolizumab): MK-3475 200 mg flat dose every 21 days

MSI (Microsatellite Unstable) Negative With Mutator Phenotype

Age, Categorical

Sex: Female, Male

Ethnicity (NIH/OMB)

Race (NIH/OMB)

Only 11/12 were evaluable for this outcome

Spots Global Cancer Trial Database for mutation load