Laiz Fernandes Mendes Nunes

Spontaneous remission of a squamous cell carcinoma of the floor of the mouth

Spontaneous remission is a rare, but well recognized event in oncology. Certain tumours, such as melanomas, hypernephromas and neuroblastomas, are known for showing spontaneous regression. Similarly, spontaneous regression of oral lymphomas, as well as oropharyngeal and recurrent tongue carcinomas, has been reported. Here, we present a novel case of a patient with a primary squamous cell carcinoma on the floor of the mouth whose tumour regressed spontaneously in three months, without any treatment. We also review of the literature on the spontaneous remission of oral cancer and discuss possible mechanisms for this phenomenon.

Intraoral granulocytic sarcoma as a manifestation of myelofibrosis: A case report and review of the literature

Granulocytic sarcoma (GS) is an extramedullary tumor associated with myelodysplastic syndromes or myeloproliferative diseases. Intraoral manifestations are considered uncommon, with a reasonable number of cases, and are mostly related to leukemia. The association of oral GS and myelofibrosis is very rare and only three cases have been published. In this paper, we report the fourth case of oral lesion in a patient with a diagnosis of myelofibrosis. The aim of this study was to present a review of the literature, discussing the current and previous cases of oral GS associated with myelofibrosis or other hematological disorders and the importance of accurate diagnosis through clinical, microscopic, and immunohistochemical features.

Mature dendritic cell density is affected by smoking habit, lesion size, and epithelial dysplasia in oral leukoplakia samples

OBJECTIVE To compare the densities of CD1a + immature and CD83+ mature dendritic cells, and inflammatory infiltrate cells between smokers and non-smokers with oral leukoplakia. Parameters associated with malignant transformation were also evaluated. DESIGN 21 smokers and 23 non-smokers diagnosed with oral leukoplakia were obtained. Densities of inflammatory infiltrate cells were calculated in H&E sections. Immunohistochemistry using anti-CD1a and anti-CD83 was performed and densities were calculated. Comparisons and statistical analyses were performed among the groups and parameters as gender, lesion size, site, and presence of cell dysplasia were analyzed. RESULTS A lower density of CD83+ cells was observed in smokers compared to non-smokers (P < 0.05). For samples of smokers, a lower density of CD1a + cells, CD83+ cells, and inflammatory infiltrate cells was observed in samples with <10 mm compared to samples ≥10 mm of diameter (P < 0.05), and a lower density of CD83+ cells was also observed between samples without dysplasia compared to samples with dysplasia (P < 0.05). CONCLUSION In oral leukoplakia samples, dendritic cell density decreases in the presence of smoking habit, and increases in larger lesions and with epithelial dysplasia. Smoking habit is an external factor that contribute to alteration of the anti-tumoral immune defense system in lesions of oral leucoplakia, reinforcing that smoking elimination is important to control the development of this disease.