On her eighth day of hospitalization, with no further fever and clinically significant improvement in the rash, mucosal lesions, and edema, laboratory tests were performed again (Table 1), revealing persistent anemia (Hb: 11 g/dL), mild thrombocytosis (platelets: 496 × 103/μL), resolution of neutrophilia (2.8 × 103/μL), recurrence of lymphopenia (1.6 × 103/μL), improvement in CRP (5.39 mg/dL), decreased D-dimer (1507 ng/mL), and increased ferritin (149.06 ng/mL). This evidence concerns the gene GSTM1 and anemia (phenotype).