In addition, patients with MAS had higher levels of ALT (62 IU/L vs. 30.1 IU/L, p = 0.0003), AST (68.7 vs. 38.0 IU/L, p = 0.00001), and triglycerides (3.6 mmol/L vs. 2.0 mmol/L, p = 0.006), and, as expected, they had lower median fibrinogen levels (2.7 g/L vs. 5.5 g/L, p = 0.0000001). This evidence concerns the gene GPT and macrophage activation syndrome.