Graph showing Tumor weight versus days since Mammary Fat Pad (MFP) implant of the MDA-MB-468 tumor in SCID mice. There were four groups in the study. Group 1: 1x10^7 cells were implanted MFP. 88% Take Rate. Group 2: 7.5x10^6 cells were implanted MFP. 100% Take Rate. Group 3: 5x10^6 cells were implanted MFP. 100% Take Rate. Group 4: 2.5x10^6 cells were implanted MFP. 100% Take Rate. Notes: Eight animals were assigned to each group. Starting at Day 54, animals in various groups that had reached endpoint were removed from the study resulting in fluctuations in the growth curves at subsequent time points. One animal in Group 1 had no observable tumor growth post implant.