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). Here, GSTM1 is linked to anemia (phenotype).