Table 1.

Patterns of endothelial VEGFR2 expression in tumor blood vessels in xenografted tumors and clinical cancer

Tumor Type	# of Tumors	% VEGFR2 Positive	% VEGFR2 Negative
SW480 xenograft	4	60 ± 10.57a	40 ± 12.61c
Clinical colorectal carcinoma	36	60 ± 3.06a	40 ± 2.54c
WM239 xenograft	10	91.96 ± 3.01b	8.04 ± 0.41d
Clinical metastatic melanoma	14	93 ± 3.29b	7 ± 0.33d

Table I - VEGFR2 heterogeneity was assessed in human clinical specimens and xenografts of both colorectal carcinoma and metastatic malignant melanoma using dual immunofluorescence staining for VEGFR2 and CD31. The mean values for average percentage of VEGFR2 positive and VEGFR2 negative vessels were calculated along with SEM. Values with the same superscript (a-m) are significantly different from the same vessel class in different cancer types, but not from each other (p < 0.05).