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Metastatic tumours to the oral region are rare, and those reported in the buccal soft tissues are even less frequent. We describe a case of anaplastic carcinoma of the lung in a 60-year-old man, presenting a huge oral metastasis as the first sign of his primitive lung malignancy. Clinically, the oral lesion mimicked a high-grade primitive carcinoma of the oral cavity. The biopsy established the gingival metastasis from lung cancer which was confirmed by a fine-needle aspiration cytology examination. We report an uncommon case of metastatic lung carcinoma to the gingiva emphasizing the differential diagnosis between primary and metastatic tumours; a short discussion on the pathways of metastatization to oral cavity soft tissues, as well as brief review of the literature are also presented.

Background: Catenins belong to a family of proteins that mediate the binding between intracytoplasmic domain of cadherins and cytoskeleton. Few data on distribution of beta and gamma catenins in non-neoplastic tissues are available from current literature. This study aims to evaluate distribution of beta and gamma catenins in oral epithelium., Methods: Nine formalin-fixed and paraffin-embedded samples of oral epithelium were retrieved from files of Department of Oral Pathology of the University of Naples "Federico II". These samples were tested with anti-beta and anti-gamma monoclonal antibodies revealed by standard streptavidin-biotin-peroxidase technique. Sections have been evaluated by two observers by optical microscope using a 40X objective. The number of positive cells has been evaluated using a semi-quantitative method., Results: The results of this study show that beta and gamma catenins were mostly distributed in the upper two-thirds of oral epithelial thickness, except for keratinized areas which appear negative. Basal layer is positive except for the basal side of basal cells. Keratinized layers are negative for beta and gamma catenins., Conclusions: In physiologic conditions staining pattern for beta and gamma catenins is almost exclusively membranous, sometimes cytoplasmic but never nuclear. This staining is well-represented even in conditions of chronic inflammation and leucoplakia.

Materials and Methods: Ten human healthy teeth were extracted for orthodontic or surgical purposes and processed for histological and immunocytochemical examination with the streptavidin-biotin-peroxidase method. Highly purified antibodies were used to reveal the distribution of intermediate filaments (vimentin, desmin, alpha-smooth muscle actin), histiocytic antigens (alpha-1-antitrypsin, lysozyme), neural and neural-crest-associated antigens (neuron-specific enolase, chromogranin-A, S-100, synaptophysin, glial fibrillary acidic protein, neurofilaments) in the adult pulp tissue., Results: Vimentin immunostaining was strongly positive in the network of pulpal fibroblasts. Desmin and alpha-smooth muscle actin were present only in the vessel walls. Staining for alpha-1-antitrypsin and lysozyme reveals a number of macrophage-like cells in the central portion of the pulp. Macrophages were the most dominating immunocompetent cells. Negative immunostaining for chromogranin-A demonstrated the absence of neuroendocrine antigens in the adult dental pulp. Immunostaining for neuron-specific enolase, S-100 protein, synaptophysin, glial fibrillary acidic protein and neurofilaments were positive, with different intensity, in nerve fibres, but no pulp cell was found to be immunoreactive., Conclusions: The conclusion is drawn that the lack of labelling of pulp cells by the neural associated antibodies could be due to differentiation processes during tissue development.