Compared with healthy controls, salivary HOTAIR and PVT1 showed significant over-expression in PC patients (both p values were < 0.001), but there were no significant differences of salivary H19, HOTTIP, and MALAT1 levels between the two groups (p values were 0.149, 0.630 and 0.639, respectively). This evidence concerns the gene H19 and pachyonychia congenita.