PIM1 and neoplasm: Analysis of the xenograft tissue indicates that only late passage RWPE1-Pim-1 cells formed small tumors (40% incidence; n = 10, average tumor volume = 44.02±12.03 mm3 at time of sacrifice) while both early and late passage control RWPE1-Neo cells (n = 10 each) as well as early passage RWPE1-Pim-1 cells (n = 10) only formed small benign looking glands (Figure 1D).