PRTN3 and hepatitis C virus infection: ACE: angiotensin-converting enzyme; ANA: antinuclear antibodies; Anti-HBc: hepatitis B core antibody; Anti-HBs: hepatitis B surface antibody; Anti-HCV: hepatitis C antibody; cANCA: anti-neutrophil cytoplasmic antibodies; CMV: cytomegalovirus; EBV: Epstein-Barr virus; FTA-ABS: fluorescent treponemal antibody absorption; HBsAg: hepatitis B surface antigen; HIV: human immunodeficiency virus; Ig: immunoglobulin; SPE: serum protein electrophoresis; VCA: viral capsid antigen