MUC1 and neoplasm: To investigate the expression and biodistribution of MUC1 in OSCC, we performed immunohistochemical staining for MUC1 on the OSCC tissues (tumor) and the para-cancerous tissues from the Hospital of Stomatology of China Medical University, and we found that MUC1 was localized in both the cytoplasm and nucleus (Fig. 1H).