The rather high percentage of TRPS1-positive metastatic non-mammary tumors we found (36.5%) is at some variance with a previous study [8], that found only 1/11 of cutaneous metastasis of a lung carcinoma to express TRPS1 weakly, and with the results of Ai et al. [6], who found a rather low percentage of visceral (non-mammary) tumors to be TRPS1-positive. Here, TRPS1 is linked to breast cancer.