Karyometric marker features in tissue adjacent to in situ cervical carcinomas.

Subtle changes in nuclear chromatin structure have been documented in the histologically normal mucosa adjacent to neoplastic lesions. To evaluate the expression of such "marker features" in tissue adjacent to squamous carcinomas in situ (CIS) of the uterine cervix, normal-appearing ectocervical tissues from five cases of CIS were compared with ectocervical tissues from control patients with squamous metaplasia. Formalin-fixed, paraffin-embedded tissue sections were Feulgen stained and analyzed with the microTICAS video microphotometer. Discriminant analysis revealed seven features that helped to distinguish nuclei from ectocervical tissue adjacent to CIS from those of control tissue. These features reflected changes in nuclear shape and chromatin distribution that were not detected by routine histopathologic analysis. The findings may reflect a subtle premalignant change in the apparently normal mucosa adjacent to a cervical neoplasm; they may also reflect the influence of the neoplasm on the adjacent mucosa.