DNA analysis by flow cytometry is considered to be of prognostic value in epidermoid carcinoma of the head and neck. However, few and contradictory studies have been made on laryngeal carcinomas. We studied 48 epidermoid carcinomas in patients subjected to horizontal supraglottic laryngectomy with a 5-year- followup. The technique described by Hedley for fixated and paraffin-embedded tumors was used. Thirteen tumors were excluded on the grounds of presenting variation coefficients in excess of 10. Of the 35 cases analyzed, 28 (80%) were diploid and seven (20%) aneuploid. No correlation was observed between tumor ploldy and patient survival, recurrence, or any of the histopathological variables studied.