GSTM1 and anemia (phenotype): Anemia was observed in 50 patients (94.3%): mild anemia (Hb—101.2 ± 7.3 g/L) in 34%, moderate anemia (Hb—80.1 ± 6.5 g/L) in 34%, and severe anemia (Hb—55.9 ± 8.5 g/L) in 26.3% of the patients.