GSTM1 and cancer: Statistically significant associations were also observed between the presence of major complications and advanced cancer stage (≥III vs. <III, 48% vs. 23.4%, p = 0.024), Hb (11.5 ± 1.9 vs. 12.8 ± 1.7 g/dL, p = 0.001), HCT (34.7 ± 5.4 vs. 38.4 ± 4.7%, p = 0.001), and severely malnourished patients (PG-SGA category C) vs. categories A and B (42.4% vs. 23.7%, p = 0.05).