of almost all glandular and ductal epithelial cells: Breast, including Toker cells Distal convoluted tubule of kidney Type II cells of pulmonary alveoli Pancreas Salivary glands eccrine and apocrine glands of the skin Several white blood cells: Activated T cells Some B cells Monocytes Follicular dendritic cells Perineurial cells As a therapeutic drug target Using MUC1, vaccines are being tested against a type of blood cancer called multiple myeloma. The technology could in theory be applied to 90 percent of all known cancers, including prostate and breast cancer, solid and non-solid tumors. This method would activate the immune system by training T-cells to search out and destroy cells that display a specific molecule (or marker) of MUC1. MUC1 is found on nearly all epithelial cells, but it is over expressed in cancer cells, and its associated glycans are shorter than those of non-tumor-associated MUC1. Because MUC1 is overexpressed (and differently glycosylated) in many cancers it has been investigated as a drug target, e.g. for the MUC1 vaccine ONT-10, which has had a phase 1 clinical study. See also Cluster of differentiation List of histologic stains that aid in diagnosis of cutaneous conditions Mucin-1 References Further reading External links Clusters of differentiation 01 Human proteins