PROYECTO DE INVESTIGACIÓN NOTCH PATHWAY IN CIRCULATING MYELOID-DERIVED SUPPRESSOR CELLS (MDSCS) AS PREDICTIVE BIOMARKERS OF RESPONSE TO IMMUNE CHECKPOINT INHIBITORS (CPIS) IN ADVANCED TRIPLE-NEGATIVE BREAST CANCER (TNBC)   Objectives: • Characterization of Notch ligands (Delta-like and Jagged) and receptor expression levels in Circulating MDSCs in liquid biopsy prior to treatment initiation, at time of first…