Stromal CXCL1 expression is associated with tumor grade. A. Stromal CXCL1 protein expression was analyzed for association with tumor grade of IDC by Kruskall-Wallis tests, followed by Dunn’s post-hoc comparison. B. CXCL1 RNA expression values were analyzed for association with tumor grade. Statistical analyses were performed using Wilcoxon Two-Sample Tests. Statistical significance was determined by p <0.05. *p ≤0.001 ***p ≥0.05. Values expressed as Mean ± SEM.