Viability of the Human Cervical Epithelium With Dysplasia and Carcinoma In Situ 2

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Abstract
Autoradiograms of histologic slides of 58 human cone specimens with dysplasia and carcinoma in situ were analyzed after tissue samples were incubated with labeled RNA precursors, Both the vertical and lateral distributions of labeled cells were rather uniform in the major part of the epithelium, which suggested that the tissue remained metabolically active during incubation, only the uppermost epithelial cells in heavily labeled areas were devitalized as deduced by the morphologic appearance of the cells, the absence of labeling in the cells, the trypan blue exclusion test, and the trypsin digestion test. The viability of large epithelial areas suggested that the previously reported focal distribution of proliferating and nonproliferating areas in the cervical epithelium is a genuine phenomenon and not the result of focal epithelial devitalizatlon acquired during incubation.

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