Different parametric and non-parametric methods of statistics have been analysed in the assessment of diagnostic and prognostic value of nucleolar organizer regions (NORs) in epithelial colorectal neoplasms. NORs activity was studied in adenomas and so-called "small" adenocarcinomas invading only mucosa and submucosa. The data obtained show that NORs activity can help in the differential diagnosis of adenomas and in situ adenocarcinomas of the colorectum. Results of NORs evaluation depend primarily on the statistical methods used.
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