HIF1A and invasive ductal breast carcinoma: Attempts were also made to correlate R2* values with expression of HIF-1α: the mean R2* value correlated moderately with the level of HIF-1α in breast invasive ductal carcinoma (Liu et al., 2013), in human glioma (Tóth et al., 2013), but no correlation was found in renal carcinoma (Li et al., 2015).