C1GALT1 and glioblastoma: Statistically significant positive correlations between C1GALT1 and Cosmc expression levels were observed across all cancer types examined—including stomach, pancreas, colon, rectum, cervical/endocervical, bladder, kidney‐clear cell, head and neck, thyroid, breast, prostate, testicular, liver, glioblastoma, and melanoma—except for ovarian cancer.