ESR1 and cancer: The cancer genes are comprised of a proliferation set (5 genes: Ki67, STK15, Survivin, CCNB1, MYBL2), estrogen hormone receptor genes (5 genes: ER, PGR, BCL2, SCUBE2), HER2neu set (2 genes: GRB7, HER2), invasion set (2 genes: MMP11, CTSL2), and GSTM-1 (1 gene).