ABSTRACT
Abstract Introduction: Proliferative verrucous leukoplakia is a multifocal and progressive lesion of the oral mucosa, with unknown etiology, and commonly resistant to all therapy attempts with frequent recurrences. It is characterized by a high rate of oral squamous cell carcinoma and verrucou carcinoma transformations. Objective: To analyze the studies about Proliferative verrucous leukoplakia and develop a concise update. Methods: A Pubmed search identifying studies (laboratory research, case series and reviews of literature) that examined patients with Proliferative verrucous leukoplakia was realized. Results: There are not enough studies about Proliferative verrucous leukoplakia in the literature. The few found studies not present a consensus about its etiology and diagnosis criteria. Although several treatment strategies have been proposed, most of them still show a high recurrence rate. Conclusion: More research about Proliferative verrucous leukoplakia is necessary to understand and treat this disease.
Resumo Introdução: Leucoplasia verrucosa proliferativa (LVP) é uma lesão multifocal e progressiva da mucosa oral, com etiologia desconhecida e comumente resistente a todas as tentativas terapêuticas, com recorrências frequentes. É caracterizada por uma alta taxa de transformação em carcinoma de células escamosas e carcinoma verrucoso da cavidade oral. Objetivo: Analisar os estudos sobre LVP e elaborar uma atualização resumida. Método: Foi realizada uma pesquisa na base de dados Pubmed que identificou estudos (pesquisas laboratoriais, séries de casos e revisões de literatura) que avaliaram pacientes com LVP. Resultados e discussão: Não há estudos suficientes sobre LVP na literatura. Os poucos estudos encontrados não apresentam consenso quanto aos critérios de etiologia e diagnóstico. Embora várias estratégias de tratamento tenham sido propostas, a maioria ainda apresenta alta taxa de recorrência. Conclusão: Mais pesquisas sobre LVP são necessárias para entender e tratar essa doença.
Subject(s)
Humans , Male , Female , Leukoplakia, Oral/diagnosis , Leukoplakia, Oral/etiology , Leukoplakia, Oral/pathology , Leukoplakia, Oral/therapyABSTRACT
The selection of an appropriate demineralizing solution in pathology laboratories depends on several factors such as the preservation of cellularity, urgency of diagnostic and financial costs. The aim of this study was to test different decalcification bone procedures in order to establish the best value of these in formalin-fixed and paraffin-embedded samples. Femurs were removed from 13 adult male Wistar rats to obtain 130 bone disks randomly divided into five groups that were demineralized in different concentrations of nitric acid (Group I); formic acid (Group II); acetic acid (Group III); EDTA, pH7.4 (Group IV) and Morsés solution (Group V). Serial, 3-µm-thick sections were obtained and stained with hematoxylin-eosin to calculate the percentage of osteocyte-occupied lacunae. The sections were also stained with Masson's trichrome in conjunction with picrosirius red under polarized light followed by a semi-quantitative analysis to verify the adjacent muscle-to-bone integrity and preservation of collagen fibres. The highest percentage of osteocyte-occupied lacunae was found with 10% acetic acid solution (95.64 ± 0.95%) and Group I (nitric acid) demanded the shorter time (0.8-5.7days). Of all solutions, 5% nitric acid incurred the lowest cost to achieve complete demineralization compared with other solutions (p < .001). Group IV (EDTA) had the highest integrity of muscle and collagen type I and III (P < 0.01). Demineralization with 10% acetic acid was the most effective at preserving bone tissue, while 5% EDTA was the best at maintaining collagen and adjacent muscle to bone. In conclusion, nitric acid at 5% showed the most efficient result as it balanced both time and cost as a demineralizing solution.
Subject(s)
Bone Demineralization Technique/economics , Bone Demineralization Technique/methods , Decalcification Technique/economics , Decalcification Technique/methods , Femur/chemistry , Time and Motion Studies , Acetic Acid/chemistry , Animals , Bone and Bones/chemistry , Collagen Type I/analysis , Collagen Type III/analysis , Edetic Acid/chemistry , Formates/chemistry , Male , Muscles/physiology , Nitric Acid/chemistry , Rats , Rats, Wistar , Staining and Labeling/economics , Staining and Labeling/methodsABSTRACT
INTRODUCTION: Proliferative verrucous leukoplakia is a multifocal and progressive lesion of the oral mucosa, with unknown etiology, and commonly resistant to all therapy attempts with frequent recurrences. It is characterized by a high rate of oral squamous cell carcinoma and verrucou carcinoma transformations. OBJECTIVE: To analyze the studies about Proliferative verrucous leukoplakia and develop a concise update. METHODS: A Pubmed search identifying studies (laboratory research, case series and reviews of literature) that examined patients with Proliferative verrucous leukoplakia was realized. RESULTS: There are not enough studies about Proliferative verrucous leukoplakia in the literature. The few found studies not present a consensus about its etiology and diagnosis criteria. Although several treatment strategies have been proposed, most of them still show a high recurrence rate. CONCLUSION: More research about Proliferative verrucous leukoplakia is necessary to understand and treat this disease.
