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)

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.

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