ENPP2 and Pruritus: Moreover, ATX antigen levels correlated significantly with T- and G-conjugated BA in ASC patients with pruritus (T: r = 0.8857, p = 0.0333; G: r = 0.9429, p = 0.0167), and without pruritus (T: r = 0.7231, p = 0.0047; G: r = 0.5956, p = 0.0274).