PPP1CB and glioblastoma: The result confirmed that rs9309664 is significantly associated with PPP1CB expression in blood cells from two independent datasets (P = 6.19 × 10−6 and P = 3.4 × 10−26; Supplementary Table S5), as well as rs7475 showed significant association with PPP1CB expression in a glioblastoma cell line from an independent dataset (P = 0.00024; Supplementary Table S5).