S100A6 and oculocutaneous albinism type 1: IL-18 values were the highest in ATN (71.13 [65.45] pg/mL), followed by HRS (44.75 [25.53] pg/mL) and PRA (28.95 [31.78] pg/mL), successfully differentiating ATN from both PRA (p < 0.001) and HRS (p = 0.012).