Anemia was present in 6 out of 7 patients (Figures 1B, C) and there was a trend towards a negative correlation between endogenous EPO levels and hemoglobin (Hb; r = -0.5357, P = 0.2357) or hematocrit (r = -0.6071, P = 0.1667) at hospital admission. Here, GSTM1 is linked to anemia (phenotype).