Hazard ratio of EXO1 gene expression across 6 independent breast tumor profiles with relapse free survival as endpoint (Figure 2A) and Kaplan Meier survival curves for EXO1 expression with overall survival information as endpoint (Figure 2B-2C) clearly implies the poor clinical outcome associated with higher level EXO1 expression in breast cancer patients. This evidence concerns the gene EXO1 and breast cancer.