Phyllodes tumors - rare breast malignancies accounting for 0.5 to one percent of all breast tumors - tend to be more prevalent in Hispanic patients

Population-based estimates indicate that the incidence of malignant phyllodes tumors is 2.1 cases per million women, with the highest frequencies in Hispanic women. Hispanics have a higher percentage of borderline and malignant tumors and tend to have larger tumors and higher mitotic rates, the rate at which cells in the tumor are dividing.