To determine the utility of measuring the tumor proliferation index as a prognostic marker in patients with non—small-cell lung cancer.
Immunostaining for the proliferationassociated antigen Ki-67, quantitated using computerassisted image cytometry, was used to derive the tumor proliferation index for 61 fresh-frozen, banked specimens of non—small-cell lung cancer. DNA ploidy was measured concomitantly for all specimens. A median follow-up of 38 months was achieved for survival analyses.
A large southeastern United States private referral institution and affiliated hospital provided the study environment.
A consecutive, convenience sample of 61 patients was enrolled based on resected tissue preservation and viability over a five-year accruement.
Main Outcome Measures:
Significant associations between DNA content, proliferation index, established clinicopathological parameters, and outcome were examined.
A significant inverse association between patient survival and tumor proliferation index was found that was independent of other established clinicopathological predictors of outcome. Patients whose tumors harbored a proliferation index of less than 3.5 survived significantly longer than patients with tumors demonstrating higher values. No association between DNA content and proliferation index was uncovered.
Measurement of the proliferation index, as derived from quantitative Ki-67 immunostaining and analyzed by image cytometry, may provide significant complementary, if not independent, prognostic information for patients with non—small-cell lung cancer.(Arch Surg. 1993;128:1382-1390)