CCDC26 and pachyonychia congenita: According to the correlation of Linc00976 expression and the PC clinical pathology features (Table 2), We found that Linc00976 expression was significantly correlated with tumor size (P < 0.01), lymph node metastasis (P < 0.01), Perineural invasion (P < 0.01), vascular invasion (P < 0.05) and distant metastasis ability (P < 0.05).