The role of ppGalNAc‑T family in breast cancer development and progression.

Glycosylation of proteins is an essential process in all eukaryotes. Mucin‑type O‑linked glycosylation is an evolutionarily conserved protein modification as a kind of glycosylation of proteins. The role of O‑glycosylation was well documented in multiple cancers. While in breast cancer, the enzymes that catalyzed the initiation of O‑glycosylation remained elusive. In this review, we briefly introduced the process of the initiation of O‑glycosylation and summarized the roles of enzymes that catalyzed the initiation step of O‑glycosylation in the breast cancer carcinogenesis, development, and progression. Finally, we summarized some attempts exploring the therapy against aberrant O‑glycosylation.