Interestingly, the serum factor H levels in the AIH group were significantly different from those in the HC group depending on the severity of AIH (HC, 549 μg/ml; mild AIH, 670 μg/ml; moderate AIH, 554 μg/ml; severe AIH, 396 μg/ml) (Fig. 1C). Here, CFH is linked to autoimmune hepatitis.