The expression of zinc finger transcription factor Trps1 (TRPS1) has been recently found to be specific for tumors of the breast. In normal skin, the expression of TRPS1 is found in outer root sheath, sebocytes and matrical cells of the hair follicle, as well as the inner luminal cells of eccrine glands. Cutaneous tumors with origin in these cell types were hypothesized to express TRPS1. Because little knowledge exists about the expression of TRPS1 in nonmelanocytic tumors of the skin; researchers from The University of Texas MD Anderson Cancer Center performed immunohistochemical (IHC) analysis of TRPS1 in different types of cutaneous tumors.