We next examined the effects of FOXM1-B (FOXM1#2) and FOXM1-C (FOXM1#1) siRNAs on cell proliferation and colony formation in MDA-MB-231 and BT-20 cells by using a clonogenic assay, which measures the ability of tumor cells to grow and form foci [44]. The gene discussed is FOXM1; the disease is neoplasm.