Dolichyl-phosphate N-acetylglucosaminephosphotransferase 1 (DPAGT1) is a key component of the N-glycosylation process [71], and the inhibition of DPAGT1 by the glycosylation inhibitor tunicamycin has been shown to resensitize trastuzumab-resistant HER2+ breast tumors. This evidence concerns the gene DPAGT1 and breast neoplasm.