For instance, Zhang et al. proposed considering sitosterolemia in patients presenting with xanthomas, TC ≤ 15.41 mmol/L, LDL-C ≤ 13.22 mmol/L, mean platelet volume ≥ 9.05 fl, or Hb ≤ 120 g/L [18]. This evidence concerns the gene GSTM1 and sitosterolemia.