Cancer cells expressing KLF5, acetylation-deficient K369R, or the vector control (PLHCX) were subcutaneously injected into nude mice, and tumors were surgically isolated at day 35 for PC-3 cells (a) and day 38 for DU 145 cells (b) post injection. The average tumor weight (grams, g) is shown in the bar figures at left, with the standard error indicated at the top of each bar. Images of all tumors are shown at right. *, P<0.05; ***, P<0.0001.