Interestingly, although though there was no survival difference by GALNT1 expression in the whole breast cancer cohort, as shown in Figure 1, we found that increased GALNT1 expression was significantly associated with worse OS and disease-specific survival (DSS) in AYA patients, whereas there was no association in the older patients in the METABRIC cohort (Figure 2B,C; p = 0.023 and 0.017 in AYA patients, and p = 0.818 and 0.169 in older patients, respectively). Here, GALNT1 is linked to breast cancer.