Studies demonstrate that p53, Ki67, CD117, EGFR, p16, and VEGF (being the lowest in benign phyllodes tumors and the highest in malignant phyllodes tumors) are associated with histologic grades of phyllodes tumors, but none has been proven to be clinically useful11,12,13,14. The gene discussed is MKI67; the disease is malignant breast phyllodes tumor.