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Oral Dis. 2001 Jan;7(1):18-24.

Potentially malignant oral lesions in northern Ireland: a 20-year population-based perspective of malignant transformation.

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1
School of Dentistry, Queen's University Belfast, Royal Group of Hospitals, Grosvenor Road, Belfast BT12 6BP, Northern Ireland.

Abstract

This retrospective laboratory-based study investigates the potential for malignant transformation of oral mucosal lesions in a population of 1.6 million. Over the 20-year period there were 745 patients diagnosed with primary intra-oral squamous cell carcinoma (OSCC), 165 patients with dysplasia and 1182 patients with 'non-dysplastic' lesions (epithelial hyperplasia, hyperkeratosis epithelial atrophy, lichen planus and lupus erythematosus). Malignant transformation occurred in 15% of dysplasias and in 1% of 'non-dysplastic' lesions at average intervals after diagnosis of 48 and 65 months respectively. Only 6% of patients with OSCC had a pre-invasive lesion biopsied. These data suggest that white lesions are only rarely the pre-invasive phase of OSCC. It is possible therefore that early changes are red, small or even microscopic with carcinoma developing without a clinically observable phase. More effective management strategies will require the development of tissue markers to enhance early detection.

PMID:
11354915
[Indexed for MEDLINE]

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