IDH1 and breast cancer: Univariate logistic analysis revealed that low IDH1 expression levels resulted in poor DSS (crude hazard ratio (CHR), 1.64; 95% confidence interval (CI), 1.14–2.38; p = 0.008) and DFS (CHR, 1.58; 95% CI 1.07–2.34; p = 0.023) in patients with breast cancer (Table 2 and Fig. 2).