CEACAM5 and pachyonychia congenita: For diagnosis of PC, CEMIP was 95% sensitive and 84% specific, with AUC of 0.86 while CEA was 80% sensitive and 65% specific, with AUC of 0.80 and that of serum CA 19 − 9 was 58% sensitive and 69% specific, with AUC of 0.80.