tokens: RESULTS : Serum sFas was significantly increased in patients with acute liver failure ( median , 26 . 8 U / mL ; range , 6 . 9 - 52 . 7 U / mL ) compared to the normal controls ( median , 8 . 6 U / mL ; range , 6 . 5 - 12 . 0 U / mL , P < 0 . 0001 ) .