Malignancy associated changes in squamous epithelium of the head and neck region.

Subtle cellular changes are known to exist in normal host tissue adjacent to tumours. These are called malignancy associated changes (MAC). To get more insight into the degree of expression and local spread of such changes we performed high resolution image cytometry on visually normal intermediate cell nuclei in smears from patients with laryngeal or pharyngeal squamous cancer. The smears were taken from the tumour surface, from a border region of the tumour and from a distant unsuspicious buccal site. In addition buccal smears from healthy control persons were examined. In a pilot study smears from 12 cancer patients and 11 control persons and in a succeeding validation study 63 controls, 18 non-tumour patients and 25 cancer patients were investigated. In both studies the occurrence of MACs was demonstrated quantitatively. In cancer patients normal appearing intermediate cells from the three different sampling sites could be discriminated with 65% in the pilot study and with 53% correct classification in the validation study. In addition the influences of smoking behaviour and sex were investigated in the control group. Only in the latter case there was a significant difference between female and male with a 63% correct cell and 71% correct specimen classification.