Comparing Continued Pembrolizumab Treatment to Observation After Complete Response in Early-Stage Triple-Negative Breast Cancer

What this Trial Is About

Researchers are evaluating whether simply observing patients after surgery is as effective as continuing pembrolizumab treatment in preventing cancer recurrence in people with early-stage triple-negative breast cancer TNBC who had a complete response after receiving chemotherapy plus pembrolizumab before surgery. This Phase III trial aims to determine if stopping pembrolizumab post-surgery can maintain recurrence-free survival while potentially improving quality of life and reducing treatment burden. Participants are randomly assigned to one of two groups after finishing chemotherapy with pembrolizumab and surgery. One group continues pembrolizumab intravenously every 3 or 6 weeks for 27 weeks. The other group undergoes observation without further pembrolizumab for the same period. Throughout the study, patients have tumor biopsies and blood collected, along with imaging such as mammography, breast ultrasound, or MRI during follow-up. Participants will be monitored for recurrence-free survival and overall survival for up to 10 years. The study also assesses adverse events, quality of life, financial impact, and work productivity at about 27 weeks after starting the assigned treatment or observation. Safety and treatment effects are tracked through biopsies, imaging, blood tests, and patient questionnaires during the study and follow-up.

Pembrolizumab vs. Observation in People With Triple-negative Breast Cancer Who Had a Pathologic Complete Response After Chemotherapy Plus Pembrolizumab