The effect of ART on the growth and CD31 expression of xenografts. Each group of mice was composed of five male nude mice. HeLa (A) or SiHa cells (B) were inoculated under the skin of nude mice. Tumor size was measured at 2 day intervals. *P < 0.05, compared with IR alone group. Data are presented as means ± SEM. Representative IHC showing CD31-stained microvessels in the xenografts from HeLa (C) and SiHa cells (D). Scale bar represents 50 μm (magnification, × 400).