MUC21 and neoplasm: Moreover, our analysis of the GSE28735 dataset, which contains 45 tumor samples and 45 paired adjacent nontumoral samples, showed a similar pattern with a significant increase in membrane-bound MUC1, MUC3, MUC4, MUC13, MUC16, MUC17, MUC20, and MUC21 mucin mRNA (Figure S1A) and the MUC5B secreted mucin mRNA (Figure S1B).