KCNK15 and pachyonychia congenita: A large number of differentially expressed lncRNAs and mRNAs were identified between PC and adjacent normal tissues, among which three markedly down‐regulated lncRNAs (lncPCTST, XLOC_000647 and KCNK15‐AS1) in PC tissues were reported to be correlated with the progression and prognosis of PC.26, 27, 28