Vessel density (a,c) and size (b,d) of LYVE-1-positive peri-tumoral or intra-tumoral lymphatic vessels of tumors of HCT116 human colon cancer cells (a,b) or CT26 mouse colon carcinoma cells (c,d) grown in K14-hIL8/nude versus control nude mice. Six to 8 mice were used per group and tumors were grown for three weeks. Vessel density (e) and size (f) of LYVE-1-positive lymphatic vessels in the peri-tumoral and intra-tumoral areas of CT26-induced tumors in BALB/c wild-type (n=10) versus BALB/c CXCR2 KO (n=10) mice. Tumor-related experiments were performed twice with comparable results. All data are displayed as an average ± standard deviation. *, p < 0.05; **, p < 0.01.