FNDC3B and pachyonychia congenita: Subsequently, univariate Cox analysis revealed that high expression of FNDC3B in PC patients was associated with poor OS (HR = 1.880, 95%CI 1.235–2.862; P = 0.003), DSS (HR = 2.168, 95%CI 1.344–3.498; P = 0.002) and PFI (HR = 1.822, 95%CI 1.223–2.710; P = 0.003).