But in the study of Sattur S et al., the proportion of patients with anemia prior to PCI in patients with PPA was not mentioned, and there was significant difference in baseline Hb between patients with PPA and without PPA (12.1 ± 1.3 gm/dL vs. 14.1 ± 1.4 gm/dL, P < 0.0001). This evidence concerns the gene GSTM1 and primary progressive aphasia.