MUC1 and neoplasm: Apart from that, according to prior works and research on human mucin MUC1, there are specific characteristics of tumor-related MUC1, including (1) a high abundance [24], (2) apical localization loss as well as alterations to a peripheral one [25,26], and (3) abnormal glycosylation that induces tumor-related antigen epitope formation [27,28,29] (Figure 3).