The goal of this clinical trial is to identify cellular and molecular determinants of response to neoadjuvant immunochemotherapy in women aged 18 or older with early-stage triple-negative breast cancer (TNBC). The main questions it aims to answer are: * Can detailed immune profiling of the tumor and its microenvironment predict pathological complete response (pCR, RCB-0) versus partial/non-response (RCB-I, II, III) to neoadjuvant immunochemotherapy? * Are there specific immune or molecular biomarkers (e.g., TILs, CD3/8/20, FoxP3, PDL1, transcriptomic signatures) associated with progression-free survival and overall survival in this population? Researchers will compare patients achieving pCR (RCB-0) to those with residual disease (RCB-I, II, III) to determine if immune and molecular profiles can discriminate responders from non-responders and guide personalized treatment strategies.
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Comparison of Immune Determinants According to Response to Neoadjuvant Immunochemotherapy
Timeframe: Baseline (pre-treatment tumor biopsy) and up to 5 years (annual blood samples and clinical follow-up).
Comparison of Immune Determinants According to Progression-Free Survival (PFS)
Timeframe: From baseline (pre-treatment) through 5 years of follow-up.
Comparison of Immune Determinants According to Overall Survival (OS)
Timeframe: From baseline (pre-treatment) through 5 years of follow-up