Characteristics of the expression of matrix metalloproteinases and their gene polymorphism in cases of benign laryngeal lesions, precancerous conditions and laryngeal cancer

The goals of the study were as follows: 1. To determine the changes in the expression of the laryngeal tissues MMP-2 and MMP-9 in patients with benign laryngeal tumors (vocal fold polyps), precancerous laryngeal lesions (recurrent respiratory papillomatosis and laryngeal keratosis) and laryngeal squamous cell carcinoma, and assess the diagnostic value of the aforementioned changes. 2. To assess the correlations between the changes in the expression of the laryngeal tissues MMP-2 and MMP-9 and the clinical and morphologic indications of benign laryngeal tumors (vocal fold polyps), precancerous laryngeal lesions (recurrent respiratory papillomatosis and laryngeal keratosis) and laryngeal squamous cell carcinoma. 3. To compare the rate of MMP-2 (-735 C/T), MMP-2 (-1306 C/T), MMP-9 (-1562 C/T) and MMP-3 (-1171 5A/6A) gene polymorphism in cases of non-malignant laryngeal lesions and laryngeal squamous cell carcinoma. 4. To assess the association between MMP-2 (-735 C/T), MMP-2 (-1306 C/T), MMP-9 (-1562 C/T) and MMP-3 (-1171 5A/6A) gene polymorphism, the laryngeal squamous cell carcinoma as well as its clinical and morphologic indications