Histological slides of primary tumors and regional lymph nodes from 134 unselected patients operated on for colorectal carcinoma of Dukes' Class B were assessed semiquantitatively for the presence of perivascular lymphocyte cuffing in the muscular layers and pericolic/subserosal fat immediately subjacent to the tumors and for paracortical hyperplasia in the regional lymph nodes. These two immunomorphological features related significantly to each other (p less than 0.05), and their combined presence related signifcantly to favorable disease-free interval (p = 0.02) and to survival (p = 0.04), making possible the identification of a subgroup of approximately one-third of Dukes' B class patients with an estimated better than 85% chance for 5-year recurrence-free survival.
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