GSTM1 and lymphopenia: Laboratory investigations revealed normocytic anemia (Hb 92 g/L, MCV 81.8 fL), leukopenia (2.9 × 109/L) with marked lymphopenia (Ly 0.4 × 109/L), elevated C-reactive protein (CRP 51.7 mg/L; n.v 0–5 mg/L) and ferritin (1262 μg/mL; n.v 22–275 μg/mL).