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The malignant transformation of leukoplakias is an important issue, on the one hand because the lesions are often present for a long time and actching of the malignant transformation is no eassy, and on the other hand because they spread over a large area.Between 2006 and 2012 a number of 12 patients presenting malignant transformed leukoplakias were operated; seven were men and five women. In four...