(b) Correlation analyses of RNA expression levels of uPA (PLAU gene), PAI-1 (SERPINE1 gene), and the neutrophil marker gene FPR1, and overall survival of breast cancer patients (stages 0 and 1) with high and low PLAU or SERPINE1 gene expression levels (cut-off z≥ 2.0) in the METABRIC breast cancer cohort. 