To further characterize important prognostic factors in colorectal cancer of the Dukes' B class the pathologic material from 143 Dukes' B patients was reviewed for the presence of lymphatic and/or blood vessel invasion and correlated with the postoperative tumor-free interval and overall length of survival. In 27 patients with vascular invasion within the bowel wall, both the tumor-free interval and the overall survival time were not significantly different from the same parameters in 116 patients without vascular invasion (P = 0.28, P = 0.12 respectively). These data suggest that vascular invasion within the bowel wall per se is not an important prognostic factor among patients with colorectal cancer of the Dukes' B class.
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