Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-11T17:13:29Z No. of bitstreams: 1 AmandaKatarinnyGoesGonzaga_DISSERT.pdf: 1835660 bytes, checksum: a28b135b95778c05d70612e36f55c1d9 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-07-14T17:10:18Z (GMT) No. of bitstreams: 1 AmandaKatarinnyGoesGonzaga_DISSERT.pdf: 1835660 bytes, checksum: a28b135b95778c05d70612e36f55c1d9 (MD5) / Made available in DSpace on 2016-07-14T17:10:18Z (GMT). No. of bitstreams: 1 AmandaKatarinnyGoesGonzaga_DISSERT.pdf: 1835660 bytes, checksum: a28b135b95778c05d70612e36f55c1d9 (MD5) Previous issue date: 2016-02-19 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / A queilite act?nica (QA) ? uma les?o potencialmente maligna que acomete o vermelh?o do l?bio e resulta da exposi??o cr?nica aos raios solares. Atualmente, n?o ? poss?vel predizer quais os casos de QA progredir?o para o carcinoma de c?lulas escamosas e, portanto, alguns marcadores biomoleculares t?m sido estudados. A ciclo-oxigenase 2 (COX-2) ? uma enzima associada com a resposta inflamat?ria e superexpressa no c?ncer oral; no entanto, pouco se sabe sobre o papel desta prote?na em queilites act?nicas. Al?m disso, as modalidades terap?uticas atualmente dispon?veis para QA podem ocasionar efeitos delet?rios e citot?xicos aos pacientes. Portanto, o objetivo desse trabalho foi avaliar a express?o imuno-histoqu?mica da COX-2 em QAs de diferentes riscos de transforma??o maligna e analisar, atrav?s de acompanhamento cl?nico, a efic?cia do gel de diclofenaco s?dico a 3% no tratamento dessa les?o. A imunoexpress?o da COX-2 foi analisada semi-quantitativamente em 90 casos de QAs graduadas em baixo risco (n = 55) e alto risco (n = 35) de transforma??o maligna. O teste Qui-quadrado de Pearson foi realizado para verificar poss?veis associa??es entre a imunoexpress?o da COX-2 e a grada??o histol?gica das queilites act?nicas. O coeficiente ponderado de Kappa denotou uma boa concord?ncia interobservador (0.677). Para o estudo cl?nico, dezenove pacientes diagnosticados com QA foram orientados a realizar aplica??o t?pica do gel de diclofenaco, tr?s vezes por dia, durante 90 dias. A cada visita, os casos foram documentados atrav?s de fotografia digital e, ao final do tratamento, dois pesquisadores analisaram todas as imagens para avaliar o aspecto cl?nico do l?bio. Tamb?m foi avaliada a tolerabilidade ao f?rmaco e satisfa??o do paciente ao final do tratamento. A COX-2 esteve superexpressa em 74.4% dos casos de queilites act?nicas. Ambos os grupos, de baixo e alto risco, revelaram predomin?ncia do escore 3 (elevada imunoexpress?o), seguida dos escores 2 e 1 (baixa express?o e aus?ncia de express?o, respectivamente). N?o foi observada associa??o significativa (p = 0.283) entre a express?o de COX-2 e a grada??o histol?gica das QAs analisadas. Dos indiv?duos que participaram do estudo cl?nico, dez apresentaram remiss?o total das caracter?sticas cl?nicas da les?o (escore 1), e em tr?s pacientes, a melhora foi considerada parcial (escore 2). Um participante apresentou piora do quadro cl?nico (escore 4). Em cinco casos, o tratamento foi descontinuado devido ao desenvolvimento de leves efeitos adversos no local de aplica??o do gel. Quanto ? an?lise de satisfa??o e tolerabilidade ao f?rmaco, a maioria dos pacientes mostrou-se plenamente satisfeita com a terapia (n = 11) e relatou que o f?rmaco n?o era irritante para os l?bios (n = 9). Os resultados desse estudo demonstram que a elevada imunoexpress?o da COX-2 ? frequente em QAs; no entanto, essa prote?na n?o esteve associada ao risco de transforma??o maligna nos casos analisados. A aplica??o t?pica do gel de diclofenaco s?dico a 3% forneceu uma abordagem conveniente, n?o invasiva e bem tolerada na maioria dos casos, podendo constituir uma alternativa promissora no tratamento da queilite act?nica. / Actinic cheilitis (AC) is a potentially malignant disorder which affects the lip vermilion and results from chronic exposure to sunlight. Currently, it is not possible to predict which cases of AC may progress to squamous cell carcinoma, and therefore, some biomolecular markers have been researched. Cyclooxygenase 2 (COX-2) is an enzyme associated with inflammatory response which is overexpressed in oral cancer; however, little is known about the role of this protein in actinic cheilitis. About the treatment of this lesion, currently available therapeutic modalities to AC may cause cytotoxic effects and deleterious results to patients. Therefore, the aim of this study was to evaluate the immunoexpression of COX-2 in AC of different risks of malignant transformation and analyse, through clinical follow-up, the efficacy of diclofenac sodium 3% gel in the treatment of this condition. Epithelial immunoexpression of COX-2 was analysed semi-quantitatively in 90 cases of AC classified as low risk (n = 55) and high risk (n = 35) of malignant transformation, in which the scores were assigned: (0) 0 to 5% of positive cells - Negative; (1) 6 to 30% of positive cells - Low expression; (2) 31 to 100% of positive cells - High expression. The chi-square test of Pearson was conducted to verify possible associations between immunoexpression of COX-2 and histologic grade of actinic cheilitis. The weighted kappa coefficient denoted a good interobserver agreement (0.677). Nineteen patients diagnosed with AC were instructed to perform topical application of the gel three times a day for a period of 90 days. In each biweekly visit, a follow-up record was accomplished through digital photographs and after treatment was completed, two researchers analysed all the images to assess clinical aspects of the lip. Furthermore, tolerability to the drug and patient satisfaction after treatment were evaluated. COX-2 was overexpressed in 74.4% of AC cases. Both low and high-risk groups revealed predominance of score 3, followed by scores 2 and 1. There was no significant association (p = 0.315) between COX-2 expression and histological grading. Among the total number of participants of this clinical study, ten showed total remission of all clinical features of the lesion and three had partial improvement of these characteristics. One participant presented worsening of the clinical condition. In five cases, the treatment was discontinued due to development of mild adverse effects at the site of gel application. Regarding analysis of satisfaction and tolerability to the drug, most patients were fully satisfied with the therapy (n = 11) and reported that the drug was not irritating to the lips (n = 9). Our study demonstrates that high expression of COX-2 is common in AC; however, this protein was not associated with malignant transformation risk of the analysed cases. Topical application of diclofenac sodium 3% gel provided a convenient and well tolerated approach in most cases, and may be a promising alternative for the treatment of actinic cheilitis.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-11T17:13:30Z No. of bitstreams: 1 HugoCostaNeto_DISSERT.pdf: 13162279 bytes, checksum: 29adac7972f3d85035eb3c3d51febbdb (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-07-14T21:07:41Z (GMT) No. of bitstreams: 1 HugoCostaNeto_DISSERT.pdf: 13162279 bytes, checksum: 29adac7972f3d85035eb3c3d51febbdb (MD5) / Made available in DSpace on 2016-07-14T21:07:41Z (GMT). No. of bitstreams: 1 HugoCostaNeto_DISSERT.pdf: 13162279 bytes, checksum: 29adac7972f3d85035eb3c3d51febbdb (MD5) Previous issue date: 2016-02-22 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico - CNPq / Dentre os cistos odontog?nicos comumente encontrados na pr?tica cl?nica odontol?gica, os cistos radiculares (CRs) e os cistos dent?geros (CDs) representam conjuntamente os mais frequentes cistos dos ossos gn?ticos. Os cistos odontog?nicos possuem origem inflamat?ria ou de desenvolvimento. No entanto, altera??es inflamat?rias secund?rias podem ser vistas nos ?ltimos. Alguns estudos t?m identificado os mast?citos nessas les?es c?sticas e sua poss?vel rela??o com a angiog?nese. Nesta perspectiva, a presente pesquisa objetivou avaliar e comparar a express?o imunoistoqu?mica do CD34 e da triptase em CDs inflamados e CRs e verificar se os mast?citos influenciam na angiog?nese destas les?es. Para tanto, foram selecionados 20 casos de CDs inflamados e 20 casos de CRs para serem submetidos ? an?lise morfol?gica e imunoistoqu?mica. A imunomarca??o de cada caso foi avaliada de forma quantitativa. Ap?s a identifica??o das ?reas de maior imunorreatividade, foram analisadas a densidade microvascular (DMV), a ?rea microvascular (AMV) e o per?metro microvascular (PMV) mensurados atrav?s da imunoexpress?o do CD34 e a densidade dos mast?citos (DMC) mensurada por meio da imunoexpress?o da triptase, realizadas nas mesmas ?reas dos consecutivos campos representativos de cada caso. A an?lise estat?stica foi realizada atrav?s dos testes de Mann-Whitney, Qui-quadrado de Pearson, Exato de Fisher e Correla??o de Spearman (r), com n?vel de signific?ncia estabelecido em 5% (p < 0,05). Os resultados demonstram diferen?as estatisticamente significativas entre as les?es c?sticas supracitadas em rela??o ? avalia??o da DMC (p < 0,001). Al?m disso, a an?lise da DMV revelou diferen?as estatisticamente significativas entre as les?es c?sticas (p = 0,007) e tamb?m no que se refere ? intensidade do infiltrado inflamat?rio (p = 0,021). Por fim, observou-se nos casos de CDs inflamados, moderada correla??o positiva entre a DMC e a AMV (r = 0,660; p = 0,002), assim como moderada correla??o positiva entre a DMC e o PMV (r = 0,634; p = 0,003). Face ao exposto, pode-se concluir que os mast?citos participam em diferentes etapas da angiog?nese associada ? inflama??o dos CRs e CDs.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-11T17:13:31Z No. of bitstreams: 1 PatriciaGuerraPeixeGoncalves_DISSERT.pdf: 943209 bytes, checksum: 858cf53a3d375685e3e69be1d38caba2 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-07-15T20:21:04Z (GMT) No. of bitstreams: 1 PatriciaGuerraPeixeGoncalves_DISSERT.pdf: 943209 bytes, checksum: 858cf53a3d375685e3e69be1d38caba2 (MD5) / Made available in DSpace on 2016-07-15T20:21:04Z (GMT). No. of bitstreams: 1 PatriciaGuerraPeixeGoncalves_DISSERT.pdf: 943209 bytes, checksum: 858cf53a3d375685e3e69be1d38caba2 (MD5) Previous issue date: 2016-02-22 / A angiog?nese e a linfangiog?nese s?o altera??es tamb?m decorrentes da inflama??o gengival provocada por microrganismos presentes no biofilme dental, bem como pela a migra??o de c?lulas de defesa e secre??o de mediadores inflamat?rios no local da agress?o. Este estudo teve por objetivo avaliar a angiog?nese e linfangiog?nese em 90 esp?cimes de bi?psias de tecido gengival clinicamente saud?vel, com gengivite e com periodontite cr?nicas. Os cortes histol?gicos foram avaliados pela colora??o de hematoxilina e eosina e pela t?cnica de imunoistoqu?mica atrav?s da imunomarca??o de CD34 e podoplanina, para avaliar, respectivamente, o ?ndice angiog?nico e linfangiog?nico, por meio da t?cnica de contagem microvascular. Os resultados mostraram que h? correla??o entre os ?ndices (p=0,030), por?m, mostrou que na periodontite h? menos n?meros de vasos linf?ticos do que no tecido gengival clinicamente saud?vel (p=0,016). A podoplanina mostrou marca??o no epit?lio e que h? rela??o da intensidade de marca??o com a intensidade do infiltrado inflamat?rio, sendo mais intensa a marca??o na presen?a de infiltrado inflamat?rio severo (p=0,033). Concluiu-se neste estudo que h? menor n?mero de vasos sangu?neos na periodontite em compara??o com a gengiva clinicamente saud?vel. As sinaliza??es presentes no processo inflamat?rio, bem como o real papel da vasculatura sangu?nea e linf?tica gengival ainda n?o est?o totalmente elucidadas / Angiogenesis and lymphangiogenesis are changes that occur due to gingival inflammation caused by microorganisms present in the biofilm, as well as the migration of immune cells and secretion of mediators in the aggressed site. This study aimed to research angiogenesis and lymphangiogenesis in 90 specimens of clinically healthy, with gingivitis and chronic periodontitis gingival tissue biopsies. The histological sections were evaluated by hematoxylin and eosin and the immunohistochemical technique through immunostaining for CD34 and podoplanin. To evaluate the angiogenic and lymphangiogenic indexes we performed a microvessel counting technique. The results showed that there is a correlation between the indexes (p = 0.030), however, we observed that periodontitis showed less lymphatic vessels than clinically healthy gingival tissue (p = 0.016). Podoplanin showed positive staining in the basal layers of the epithelium, and we observed a relationship between immunostaining intensity and the intensity of inflammatory infiltrate, with more intense staining in the presence of severe inflammatory infiltrate (p = 0.033). For this study, we concluded that there are fewer blood vessels in periodontitis compared with clinically healthy gingiva. The signaling present in the inflammatory process and the actual role of gingival blood and lymphatic vasculature are not fully understood, with further studies on angiogenesis and lymphangiogenesis being suggested.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-11T17:13:29Z No. of bitstreams: 1 RodrigoPorpinoMafra_DISSERT.pdf: 2938922 bytes, checksum: c44070e8d06f2305cff5199e620a1c1c (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-07-15T20:45:06Z (GMT) No. of bitstreams: 1 RodrigoPorpinoMafra_DISSERT.pdf: 2938922 bytes, checksum: c44070e8d06f2305cff5199e620a1c1c (MD5) / Made available in DSpace on 2016-07-15T20:45:06Z (GMT). No. of bitstreams: 1 RodrigoPorpinoMafra_DISSERT.pdf: 2938922 bytes, checksum: c44070e8d06f2305cff5199e620a1c1c (MD5) Previous issue date: 2016-02-16 / O carcinoma epiderm?ide de l?ngua oral (CELO) apresenta um comportamento biol?gico agressivo, com elevada propens?o ao desenvolvimento de met?stases nodais. Nesse contexto, a linfangiog?nese ? considerada um fen?meno importante para a dissemina??o das c?lulas tumorais e pode sofrer influ?ncia de est?mulos do microambiente. Os mast?citos t?m sido relacionados ? progress?o de neoplasias malignas, no entanto o seu papel na forma??o de vasos linf?ticos ainda n?o est? bem estabelecido. O prop?sito desta pesquisa foi avaliar poss?veis correla??es entre a densidade linf?tica, a contagem de mast?citos e o perfil clinicopatol?gico em casos de CELO, incluindo o estadiamento cl?nico TNM, a grada??o histol?gica de malignidade (Bryne, 1998) e a presen?a/aus?ncia de met?stases nodais. A amostra foi constitu?da por 50 casos de CELO, dos quais 26 apresentavam met?stase nodal, e os 24 restantes eram isentos de met?stases. A densidade linf?tica foi estabelecida como a m?dia de vasos linf?ticos imunomarcados pelo anticorpo anti-podoplanina (D2-40), identificados em cinco campos microsc?picos (200x). Para a an?lise dos mast?citos, foram quantificadas as c?lulas imunorreativas ao anticorpo anti-triptase, em cinco campos (400x). Destaca-se que ambas as imunomarca??es foram analisadas no centro tumoral e no front de invas?o. A densidade linf?tica intratumoral (DLI) foi superior nos casos em est?gios cl?nicos avan?ados (III-IV), quando comparados ?queles em est?gios iniciais (I-II), assim como nos casos metast?ticos em rela??o aos n?o-metast?ticos (p<0,05). N?o houve diferen?as estatisticamente significativas entre os casos de baixo grau e alto grau de malignidade no tocante ? DLI (p>0,05). De outro modo, a densidade linf?tica peritumoral (DLP) e as contagens de mast?citos n?o demonstraram rela??es significativas com nenhum dos par?metros clinicopatol?gicos avaliados (p>0,05). Tamb?m n?o foram encontradas correla??es significativas entre as densidades linf?ticas e as contagens de mast?citos, seja na regi?o intratumoral (r = -0,004; p=0,977) ou na peritumoral (r = -0,154; p=0,285). Os resultados do presente estudo sugerem que os vasos linf?ticos intratumorais contribuem na progress?o do CELO. Por sua vez, a DLP pode n?o ser suficiente para justificar diferen?as no comportamento biol?gico do CELO, o que sustenta a hip?tese de envolvimento de outros mecanismos na dissemina??o metast?tica das c?lulas malignas, que complementariam os efeitos da linfangiog?nese. Os mast?citos, ainda que realizem diversas fun??es pr?- e antitumorais, parecem n?o influenciar diretamente o potencial de agressividade do CELO. Adicionalmente, ? poss?vel que a quantidade destas c?lulas n?o seja um fator determinante para a forma??o de vasos linf?ticos. / Oral tongue squamous cell carcinoma (OTSCC) has an aggressive biological behavior, with a high propensity for the development of lymph node metastases. In this context, lymphangiogenesis is considered an important phenomenon for the spread of tumor cells and may be influenced by microenvironmental stimuli. Mast cells have been implicated in tumor progression, although their influence in the formation of lymphatic vessels is not well established. The aim of this study was to analyze, in a case series of OTSCC (n=50), possible correlations between lymphatic vessel density (LVD), mast cell count and clinicopathological features, including tumor-node-metastasis (TNM) stage, histological grade of malignancy (Bryne, 1998), and nodal metastasis. LVD was established as the mean number of lymphatic vessels immunostained by anti-podoplanin (D2-40) antibody, identified in five microscopic fields (200x). For the analysis of mast cells, tryptase-immunoreactive cells were quantified in five fields (400x). Both immunostainings were analyzed in the tumor center and invasion front. Intratumoral lymphatic density (ILD) was higher in cases in advanced clinical stages (III-IV), compared to those in initial stages (I-II), as well as in metastatic cases in respect of non-metastatic (p<0,05). There were no statistically significant differences between low-grade and high-grade malignancy cases with respect to ILD (p>0,05). Peritumoral lymphatic density (PLD) and mast cell counts showed no significant relations with any of the clinicopathological parameters evaluated (p>0,05). Also there were no significant correlations between LVD and mast cell counts, whether in intratumoral (r = -0,004; p=0,977) or peritumoral region (r = -0,154; p=0,285). The results of the present study suggest that intratumoral lymphatic vessels may contribute in part to the progression of OTSCC, although PLD may be insufficient to justify differences in biological behavior. This supports the hypothesis of involvement of other mechanisms in metastatic spread of malignant cells, which could complement the effects of lymphangiogenesis. Although mast cells perform several pro- and antitumoral functions, they do not appear to directly influence aggressiveness of OTSCC. In addition, the quantity of these cells may not be essential for lymphatic vessel formation.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-11T17:13:29Z No. of bitstreams: 1 ThalitaSantanaConceicao_DISSERT.pdf: 2109547 bytes, checksum: 6d0e119c0da68d509313a90708cf7879 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-07-15T21:04:56Z (GMT) No. of bitstreams: 1 ThalitaSantanaConceicao_DISSERT.pdf: 2109547 bytes, checksum: 6d0e119c0da68d509313a90708cf7879 (MD5) / Made available in DSpace on 2016-07-15T21:04:56Z (GMT). No. of bitstreams: 1 ThalitaSantanaConceicao_DISSERT.pdf: 2109547 bytes, checksum: 6d0e119c0da68d509313a90708cf7879 (MD5) Previous issue date: 2016-02-19 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico - CNPq / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Os sistemas de reparo do DNA desempenham um papel cr?tico na prote??o do genoma humano contra danos causados por agentes cancer?genos presentes no ambiente. Muta??es em genes de reparo de DNA podem ser respons?veis pelo desenvolvimento de tumores e de resist?ncia das c?lulas malignas a agentes quimioterap?uticos. A principal via de reparo de danos oxidativos do DNA ? a via de reparo por excis?o de bases. O objetivo deste estudo foi investigar a imunoexpress?o da APE-1 e XRCC-1, que s?o prote?nas envolvidas no reparo do DNA por excis?o de bases, e sua associa??o com par?metros cl?nicos e histopatol?gicos em carcinoma epidermoide de l?ngua oral (CELO), a fim de investigar um poss?vel valor progn?stico para essas prote?nas. A express?o de APE-1 e XRCC-1 foi avaliada por meio de imuno-histoqu?mica em 50 casos de CELO. Os dados cl?nicos foram coletados no prontu?rio m?dico de cada paciente e a grada??o histopatol?gica foi efetuada para cada caso. A an?lise estat?stica com os testes de Qui-quadrado e Exato de Fisher foi realizada para determinar a associa??o entre as express?es das prote?nas e caracter?sticas cl?nico-patol?gicas; adotou-se um valor de signific?ncia de p<0,05. APE-1 foi altamente expressa no n?cleo e no citoplasma em 56% dos casos. XRCC-1 mostrou alta express?o apenas no n?cleo em 60% dos casos. A alta express?o de XRCC-1 foi significativamente associada aos est?dios cl?nicos I e II (p = 0,02). Ambas as prote?nas n?o foram associadas a outros par?metros cl?nicos ou grada??o histopatol?gica. Por fim, nossos resultados demonstraram que as prote?nas de reparo do DNA por excis?o de bases APE-1 e XRCC-1 est?o positivamente expressas em CELO, no entanto, n?o est?o relacionadas com par?metros cl?nicos e histol?gicos, exceto a associa??o de XRCC-1 com melhor estadiamento cl?nico. Os resultados deste experimento indicam que a express?o imuno-histoqu?mica dessas prote?nas n?o possui valor progn?stico para esta neoplasia. / DNA repair systems play a critical role in protecting the human genome from damage caused by carcinogens present in the environment. Mutations in DNA repair genes may be responsible for tumor development and resistance of malignant cells to chemotherapeutic agents. The major pathway for oxidative DNA damage repair is the base excision repair pathway. The objective of this study was to investigate the immunoexpression of APE-1 and XRCC-1, which are proteins involved in DNA base excision repair and its association with clinical and histopathological parameters in oral tongue squamous cell carcinoma (OTSCC), in order to investigate a possible prognostic value for those proteins. The expression of APE-1 and XRCC-1 was evaluated semi-quantitatively by immunohistochemistry in 50 OTSCC cases. Clinical data was collected from patients? medical charts and histopathological grading was performed for each case. Statistical analysis (Chi-square and Fisher?s exact tests; significance of 5%) was performed to determine the association between protein expressions and clinico-pathological characteristics. APE-1 was highly expressed in nucleus and cytoplasm in 56% of cases. XRCC-1 showed overexpression only in nucleus in 60% of cases. High expression of XRCC-1 was significantly associated to clinical stages I and II (P=0.02). Both proteins were not associated to other clinical parameters or histopathological grading. Our findings demonstrate that DNA base excision repair proteins APE-1 and XRCC-1 are upregulated in OTSCC, however, they are not related to clinical and histologic parameters, except for XRCC-1 association to better clinical staging. Our results indicate that the immunohistochemical expression of these proteins has no association with prognostic parameters in this tumor.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-21T17:20:00Z No. of bitstreams: 1 MelkaCoelhoSa_TESE.pdf: 3257998 bytes, checksum: 6feeeb452aad7be3dee1941b26d85af8 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-07-22T11:49:09Z (GMT) No. of bitstreams: 1 MelkaCoelhoSa_TESE.pdf: 3257998 bytes, checksum: 6feeeb452aad7be3dee1941b26d85af8 (MD5) / Made available in DSpace on 2016-07-22T11:49:09Z (GMT). No. of bitstreams: 1 MelkaCoelhoSa_TESE.pdf: 3257998 bytes, checksum: 6feeeb452aad7be3dee1941b26d85af8 (MD5) Previous issue date: 2016-02-19 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico - CNPq / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Os genes de reparo do DNA s?o essenciais para manuten??o da integridade do genoma, evitando graves doen?as como o c?ncer. O papel de v?rias prote?nas codificadas por esses genes vem sendo associado tanto ao risco do desenvolvimento, como na evolu??o de variados c?nceres humanos, dentre eles, o carcinoma epidermoide oral. O objetivo deste trabalho foi analisar a imunoexpress?o das prote?nas de reparo do DNA, XRCC1, THIIF e XPF em carcinoma epidermoide de l?ngua oral e investigar associa??o com par?metros cl?nicos, histopatol?gicos e de desfecho. Tamanho do tumor, comprometimento linfonodal, est?gio do tumor, profundidade de invas?o >4mm e o sistema de grada??o de Almangush, mostraram-se como fatores progn?sticos. Evidenciou-se de uma maneira geral, alta express?o imuno-histoqu?mica das prote?nas de reparo nas c?lulas parenquimatosas; no entanto, apenas verificou-se associa??o significativa da elevada express?o de XRCC1 com melhor estadiamento cl?nico. Os resultados deste experimento sugerem que as prote?nas XRCC1, TFIIH e XPF participam do processo de tumorig?nese, entretanto a imunoexpress?o das mesmas n?o pode ser utilizada como indicador progn?stico para o carcinoma epidermoide de l?ngua oral. / DNA repair systems, genes and proteins are essential for genome integrity maintenance, avoiding serious diseases such as cancer. Deregulation in the expression of those proteins has been associated with both the risk of development and evolution of various human cancers, including oral squamous cell carcinoma. The purpose of this study was to analyze the immunoreactivity of the DNA repair proteins XRCC1, THIIF and XPF in oral tongue squamous cell carcinoma (OTSCC) and to investigate its association with clinical and histopathological parameters, outcome and 5-year survival rate. Seventy-four cases of OTSCC were analyzed semi-quantitatively through immunohistochemistry. We observed that DNA repair proteins were highly expressed in parenchymal cells; however, we only observed a significant association between XRCC1 high expression and better clinical staging (p=0,02). Cox regression showed that tumor size (p<0,01), lymph node involvement (p=0,04), tumor stage (p=0,02) and depth of invasion> 4mm (p=0,05) were prognostic factors. The results of this experiment suggest that XRCC1, TFIIH and XPF participate in the tumorigenic process, however, their immunoexpression may not be used as an independent prognostic indicator for OTSCC.

Submitted by Reginaldo Soares de Freitas (reginaldo.freitas@ufv.br) on 2017-01-20T10:39:37Z No. of bitstreams: 1 texto completo.pdf: 1774719 bytes, checksum: 05d8e4ef7c8278c1f92b4bfc814b463b (MD5) / Made available in DSpace on 2017-01-20T10:39:37Z (GMT). No. of bitstreams: 1 texto completo.pdf: 1774719 bytes, checksum: 05d8e4ef7c8278c1f92b4bfc814b463b (MD5) Previous issue date: 2016-06-28 / As plantas vêm sendo utilizadas pela população para várias finalidades, porém muitas não têm ação comprovada. Desta forma, pesquisas que buscam identificar produtos naturais com atividade biológica representam uma alternativa para tratamento de doenças, entre elas infecções bacterianas. O uso de fitoterápicos tem sido uma opção terapêutica dos profissionais de saúde que procuram novas alternativas com potencial atividade farmacológica, menor toxicidade e menores custos a população. Assim, o objetivo deste trabalho foi avaliar a atividade antibacteriana e antibiofilme de treze óleos essenciais (canela, cravo, orégano, tomilho, laranja, lima, tangerina, eucalipto, hortelã, noz moscada, alecrim, gengibre e melaleuca) puros e incorporados a cremes dentais frente a bactérias causadoras de patologias na cavidade oral. Foram utilizadas cepas de Staphylococcus aureus ATCC 25923, Streptococcus mutans ATCC 25175, Lactobacillus sp. e Enterococcus sp. Inicialmente foi realizado o teste de difusão em ágar e apenas os óleos de C. zeylanicum (canela), E. caryophyllata (cravo), O. vulgare (orégano) e T. vulgaris (tomilho) apresentaram atividade antibacteriana. O teste de concentração inibitória mínima (CIM) foi realizado com os óleos essenciais ativos sendo observada uma potente atividade do óleo de C. zeylanicum contra a bactéria S. mutans (0,156 mg/mL). A seguir, os óleos essenciais foram testados para verificar a atividade antibiofilme tendo o óleo de E. caryophyllata apresentado atividade contra o biofilme de S. mutans de 39% a 44%, os quatro óleos ativos inibindo o biofilme de S. aureus de 92% a 95% e o óleo de O. vulgare apresentado atividade contra o biofilme de Enterococcus sp. de 43% a 60%. Posteriormente os óleos ativos foram incorporados a cremes dentais nas concentrações de 3% e 5%, puros e em associações, totalizando 18 cremes dentais fitoterápicos. O teste de difusão em ágar foi utilizado para verificar a atividade antibacteriana dos cremes dentais sendo observadas atividades significativas nas duas concentrações utilizadas. Os cremes dentais também foram submetidos ao teste de inibição do biofilme pré-formado, sendo verificado que para a bactéria S. mutans a associação dos quatro óleos essenciais inibiu 100% do biofilme. Para S. aureus 12 dos 18 cremes dentais inibiram em mais de 50% do seu biofilme e para Enterococcus sp. todos os cremes dentais obtiveram mais de 45% de ação. No presente estudo também foi observado o sinergismo entre a clorexidina e o óleo essencial de T. vulgaris para bactéria S. mutans. Os óleos ativos foram submetidos a cromatografia gasosa acoplada a espectrômetro de massa para elucidação dos componentes majoritários. Assim, os óleos essenciais de canela, cravo, tomilho e orégano e os cremes dentais fitoterápicos utilizados no presente estudo apresentaram atividade antibacteriana e antibiofilme contra bactérias cariogênicas, sendo, portanto, uma alternativa para a prevenção e terapia das doenças da cavidade oral. / Plants have been used throughout human history for various therapeutic purposes. However, for many of these plants, the supposed medicinal activities have not been proven. Thus, studies toward the identification of bioactive plant metabolites constitutes a promising alternative for the treatment of diseases, including bacterial infections. Due to the potential pharmacological activities, low toxicity, and lower costs, herbal medicines have been used by health professional as an alternative to synthetic drugs. The objective of the present work was to evaluate the antibacterial and biofilm inhibition activities of thirteen essential oils (cinnamon, cloves, oregano, thyme, orange, lime, tangerine, eucalyptus, mint, nutmeg, rosemary, ginger, and melaleuca), both in pure forms and incorporated into toothpastes, against bacteria causative of pathologies of oral cavity. Staphylococcus aureus ATCC 25923 Streptococcus mutans ATCC 25175, Lactobacillus sp. and Enterococcus sp. Were used in this study. In the preliminary investigations, results from agar diffusion tests showed that only C. zeylanicum (cinnamon), E. caryophyllata (clove), O. vulgare (oregano), and T. vulgaris (thyme) showed antibacterial activity. These oils were tested to determine their miminal inhibitory concentration (MIC), and a pontent antibacterial activity was observed for C. zeylanicum against S. mutans (0.156 mg/mL). Following, the essential oils were tested for their biofilm inhibition activities. E. caryophyllata oil inhibited S. mutans biofilm from 39% ato 44%. The four active oils inhibited S. aureus biofilm from 92% to 95%, and O. vulgare oil inhibited Enterococcus sp. biofilm from 43% to 60%. Following, the active essential oils were incorporated in toothpastes at concentrations of 3% and 5%, pures and in associations, totalizing 18 herbal toothpastes. All these toothpastes showed significant activities at both concentrations tested. Toothpaste containing association of the four active oils inhibited by 100% the formation of biofilm by S. mutans. Twelve of the eighteen toothpastes were capable of inhibiting Enterococcus sp. biofilm in 50 %, and all formulations showed more than 45% of inhibition. In these studies, a synergistic action between chlorexidine and T. vulgaris against S. mutans was observed. Finally, the active oils were analysed by gas Chromatography-Mass spectrometry and their major chemical constituents were identified. In conclusion, the essential oils of cinnamon, cloves, thyme, and oregano, as well as the herbal toothpastes containing these essential oils, showed antibacterial activities against cariogenic bacteria, indicating their potential as alternative to treatment and prevention of diseases of oral cavity.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-08-25T20:42:57Z No. of bitstreams: 1 EdilmarDeMouraSantos_TESE.pdf: 2404882 bytes, checksum: 5eff55db010b690ecc915ee6c24050f0 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-08-26T19:45:12Z (GMT) No. of bitstreams: 1 EdilmarDeMouraSantos_TESE.pdf: 2404882 bytes, checksum: 5eff55db010b690ecc915ee6c24050f0 (MD5) / Made available in DSpace on 2016-08-26T19:45:12Z (GMT). No. of bitstreams: 1 EdilmarDeMouraSantos_TESE.pdf: 2404882 bytes, checksum: 5eff55db010b690ecc915ee6c24050f0 (MD5) Previous issue date: 2016-02-24 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Falhas nos genes respons?veis por reparos no DNA podem influenciar no surgimento de c?ncer ou afetar a resposta aos tratamentos. Estudos t?m demonstrado que a varia??o na capacidade de reparo do DNA pode ser resultado de polimorfismos funcionais nestes genes, e alguns destes experimentos sugerem que a presen?a de polimorfismos de nucleot?deos simples (SNPs), em genes de reparo, est? relacionada ao desenvolvimento e resposta ao tratamento de v?rios c?nceres, incluindo o Carcinoma Epidermoide Oral (CEO) e o Carcinoma Epidermoide de Orofaringe (CEOR). Nesta pesquisa avaliou-se a frequ?ncia de tr?s SNPs em dois genes de reparo do DNA RAD51 172G>T (c.-61 G>T, rs1801321), RAD51 135G>C (c.-98 G>C, rs1801320) e XRCC3 T241M (c. 722 C>T, rs861539) em indiv?duos saud?veis (n=130) e indiv?duos com CEO e CEOR (n=126) e investigou-se poss?veis rela??es de tais achados com os desfechos cl?nicos: resposta tumoral ao tratamento com radioterapia e quimioterapia, recidiva, e sobrevida global. Constatou-se frequ?ncia al?lica e genot?pica em equil?brio. A presen?a dos SNPs analisados n?o revelou ser um fator de risco para o desenvolvimento de CEO ou CEOR; contudo, quando associado ao h?bito de fumar ou beber, aumentou o risco de desenvolver o c?ncer de tr?s a cento e cinquenta vezes (p<000,1). A resposta tumoral ao tratamento de radioterapia e quimioterapia foi semelhante nos pacientes com ou sem SNPs. Nenhum polimorfismo demonstrou signific?ncia estat?stica em rela??o ? sobrevida livre de recidiva ou sobrevida global. Os gen?tipos AA e AC do SNP rs861539 no gene XRCC3, os gen?tipos CC e CG do SNP rs1801320 e GG e GT do SNP 1801321 no gene RAD51, aumentam o risco do desenvolvimento de carcinoma epidermoide oral e de orofaringe, quando associados ao h?bito de beber ou fumar. Os polimorfismos estudados nos genes XRCC3 e RAD51 n?o est?o associados ? resposta ? radioterapia, sobrevida livre de recidiva ou sobrevida global. / Faults in the genes responsible for repairs to the DNA can influence the onset of cancer or affect the response to treatment. This research evaluated the frequency of three single nucleotide polymorphisms (SNPs) in two repair genes DNA RAD51 172g> T (rs1801321), RAD51 135G> C (rs1801320) and XRCC3 T241M (rs861539) in individuals without cancer (n = 130) and patients with oral squamous cell carcinoma (OSC) and carcinoma oropharyngeal squamous (ORSC) (n = 126) and investigated possible relationships of these findings with clinical and pathological data and clinical outcomes: tumor response to radiotherapy and chemotherapy, disease-free survival, and overall survival. It was found that the allele and genotype frequencies were in equilibrium Hard-Weinberg equilibrium. The presence of at least one polymorphic allele in XRCC3 (rs861539) gene is associated with histological grade (WHO) higher (p = 0.007). We observed a higher recurrence rate trend (p = 0.08) and more advanced stage (p = 0.08) in the group that had at least one polymorphic allele of RAD51 gene (rs1801321). The presence of the analyzed SNPs not proved to be a risk factor for the development of CEO or CEOR; however, when combined with smoking or drinking, increased the risk of developing cancer from three to one hundred and fifty times. The tumor response to radiotherapy and chemotherapy was similar in patients with and without SNPs. No polymorphism showed statistical significance in relation to recurrence-free survival or overall survival. We conclude that the presence of at least one polymorphic allele of the SNPs rs861539 in XRCC3 gene, rs1801320 and rs1801321 in the RAD51 gene increase the risk of development of OSC and ORSC, when associated with the habit of drinking or smoking. Polymorphisms studied in XRCC3 and RAD51 genes are not associated with response to radiation therapy, relapse-free survival or overall survival.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-08-25T20:42:57Z No. of bitstreams: 1 JamileMarinhoBezerraDeOliveiraMoura_TESE.pdf: 18433655 bytes, checksum: e3b33cd1bc7a5e8e3f1a6cdd83ebdcbd (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-08-26T20:02:15Z (GMT) No. of bitstreams: 1 JamileMarinhoBezerraDeOliveiraMoura_TESE.pdf: 18433655 bytes, checksum: e3b33cd1bc7a5e8e3f1a6cdd83ebdcbd (MD5) / Made available in DSpace on 2016-08-26T20:02:15Z (GMT). No. of bitstreams: 1 JamileMarinhoBezerraDeOliveiraMoura_TESE.pdf: 18433655 bytes, checksum: e3b33cd1bc7a5e8e3f1a6cdd83ebdcbd (MD5) Previous issue date: 2016-02-25 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / As neoplasias de gl?ndulas salivares exibem uma ampla variedade de comportamento biol?gico e grande diversidade morfol?gica, e esta heterogeneidade inerente a este grupo de tumores suscita o interesse em pesquisar estas les?es. As c?lulas-tronco s?o a principal fonte para a gera??o e manuten??o da diversidade celular e homeostase do tecido, dist?rbios na regula??o destas c?lulas podem levar ? produ??o de c?lulas-tronco alteradas, denominadas de c?lulas-tronco tumorais, que possuem potencial proliferativo e capazes de originar e/ou manter o tumor. Pesquisas acerca das c?lulas-tronco tumorais e das prote?nas a elas associadas em algumas neoplasias orais t?m sido desenvolvidas, no entanto, o papel destas em neoplasias de gl?ndulas salivares n?o est? ainda bem estabelecido. Desta forma, o objetivo deste estudo foi identificar c?lulas do par?nquima tumoral que expressam marcadores de c?lulas-tronco tumorais, atrav?s da avalia??o da imunoexpress?o do OCT4 e CD44, em uma s?rie de casos de neoplasias de gl?ndulas salivares. A amostra foi constitu?da por 20 adenomas pleom?rficos, 20 carcinomas mucoepiderm?ides e 20 carcinomas aden?ides c?sticos localizados nas gl?ndulas salivares menores e maiores. Todos os casos estudados exibiram express?o positiva para OCT4 e CD44, sendo observado que para ambos marcadores, as neoplasias localizadas nas gl?ndulas salivares maiores exibiram maior imunomarca??o quando comparada com as les?es das gl?ndulas salivares menores apresentando diferen?a estatisticamente significativa (p=<0,001). Na amostra total e no grupo das gl?ndulas salivares menores, as neoplasias malignas exibiram maior imunorreatividade para OCT4 do que o adenoma pleom?rfico. No entanto, n?o foi encontrada diferen?as estatisticamente significativas de imunoexpress?es entre as les?es e entre suas classifica??es/grada??es histomorfol?gicas. Analisando a correla??o entre as imunoexpress?es de OCT4 e CD44 foi observada uma correla??o positiva moderada (r=0,444) com signific?ncia estat?stica entre os mesmos. A elevada express?o de OCT4 e CD44 pode indicar que estas prote?nas desempenham papel importante na identifica??o de c?lulas-tronco tumorais, permitindo uma previs?o do comportamento biol?gico das neoplasias de gl?ndula salivar, apresentando n?veis menores em tumores benignos e maiores nos tumores malignos. / Salivary gland neoplasms exhibit a wide variety of biological behavior and a high morphological diversity raises the interest in researching these lesions. The stem cells are the main source for the generation and maintenance of cell diversity, disorders in the regulation of these cells can lead to the production of altered stem cells, termed cancer stem cells capable of generate the tumor. Researches on cancer stem cells and associated proteins have been developed in some oral cancers; however, their role in salivary gland neoplasms is not well established. Thus, the aim of this study was to identify the tumor parenchyma cells exhibiting stem cell characteristics, by evaluating the immunoreactivity of OCT4 and CD44, in a number of cases of salivary gland neoplasms. The sample consisted of 20 pleomorphic adenomas, 20 mucoepidermoid carcinomas and 20 adenoid cystic carcinoma located in minor and major salivary glands. The expression of OCT4 and CD44 was evaluated by the percentage of positive cells (PP) and the intensity of expression (IE), it is realized the sum of the scores, resulting in the total score immunostaining (PIT) ranging 0-7. All studied cases showed positive expression of OCT4 and CD44 and higher values than the control groups. It was observed that for OCT4 luminal cells and non-luminal were immunostained in the case of pleomorphic adenomas and adenoid cystic carcinoma. Already the immunoreactivity of CD44 was particularly evident in the non-luminal cells of these lesions. In mucoepidermoid carcinomas for both markers, there was immunoreactivity in squamous and intermediate cells and absence of staining mucous cells. For both markers, a statistically significant higher immunostaining was verified in neoplasms located in the major salivary glands compared with lesions in the minor salivary (p<0.001). At the total sample and in the group of minor salivary glands, malignant neoplasms exhibited higher immunoreactivity for OCT4 than pleomorphic adenoma. However, there was no statistically significant difference between the lesions and between their classifications histomorphologic. Analyzing the correlation between OCT4 and CD44 immunoexpressions, a statistically significant moderate positive correlation (r = 0.444) was observed. The high expression of OCT4 and CD44 may indicate that these proteins play an important role in identifying cancer stem cells, allowing a prediction of biological behavior of salivary gland neoplasms.

Submitted by Automação e Estatística (sst@bczm.ufrn.br) on 2018-06-05T21:48:08Z No. of bitstreams: 1 LarissaSantosAmaralRolim_DISSERT.pdf: 2305138 bytes, checksum: 14b3b617e544762c66ebb1f48bfcb9de (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2018-06-11T19:21:02Z (GMT) No. of bitstreams: 1 LarissaSantosAmaralRolim_DISSERT.pdf: 2305138 bytes, checksum: 14b3b617e544762c66ebb1f48bfcb9de (MD5) / Made available in DSpace on 2018-06-11T19:21:02Z (GMT). No. of bitstreams: 1 LarissaSantosAmaralRolim_DISSERT.pdf: 2305138 bytes, checksum: 14b3b617e544762c66ebb1f48bfcb9de (MD5) Previous issue date: 2018-02-23 / Introdução: O Carcinoma de Células Escamosas Oral (CCEO) é um grande problema de saúde pública em todo o mundo. Acredita-se que o mecanismo responsável pela progressão tumoral seja baseado na invasão coletiva ou de células individuais, chamado de Transição Epitelial-Mesenquimal (TEM), onde ocorre uma diminuição da expressão de biomarcadores epiteliais e aumento da expressão de biomarcadores mesenquimais, como Twist. A Podoplanina (PDPN), uma glicoproteína transmembranar, está envolvida na motilidade das células neoplásicas que estão passando pela TEM para orientar o complexo celular durante a invasão. Objetivo: Realizar uma análise comparativa entre a imunoexpressão da PDPN e do Twist em 40 casos de CCEs de lábio inferior (CCELI) e 36 casos de língua oral (CCELO), para analisar possíveis associações com parâmetros clínicos-patológicos (tamanho do tumor primário, metástase linfonodal regional e à distância, estadiamento clínico, grau histológico de malignidade e padrão histológico de invasão). Métodos: Para avaliação do grau histopatológico de malignidade, utilizou-se o sistema proposto por Brandwein-Gensler et al (2005). Para os dois marcadores, quatro tipos de análises imuno-histoquímica foram realizados: análise do front de invasão, das áreas compressivas do tumor, das grandes ilhas tumorais (>15 células neoplásicas) e dos ninhos/células dissociadas (<15 células neoplásicas). Para a análise das relações entre os parâmetros clínicos e histopatológicos e as imunoexpressões de PDPN e Twist, foi utilizado o teste não paramétrico de Mann-Whitney. Para verificar possíveis correlações entre as imunoexpressões de PDPN e Twist, foi realizado o teste de correlação de Spearman (r). Para todos os testes estatísticos, foi estabelecido um nível de significância de 5% (p < 0,05). Resultados: Não foram encontradas diferenças estatisticamente significativas na imunoexpressão de PDPN e Twist em relação ao tamanho do tumor, metástase e estadiamento clínico de CCELI (p > 0,05). Porém foram encontradas diferenças estatisticamente significativas na imunoexpressão citoplasmástica de PDPN em relação aos padrões de invasão tipo 4 e 5 (p = 0,032) de Brandwein-Gensler et al. (2005). Também não foram observadas diferenças estatisticamente significativas na imunoexpressão de PDPN e Twist em relação ao tamanho do tumor, metástase e estadiamento clínico de CCELO (p > 0,05). Observou-se diferenças estatisticamente significativas entre a expressão citoplasmática (p = 0,006), membranar (p = 0,030) e geral (p = 0,025) de PDPN nos CCELO com os padrões de invasão tipo 4 e 5 de Brandwein-Gensler et al. (2005). Além disso, foram observadas correlações negativas estatisticamente significativas entre a expressão membranar da PDPN e as expressões geral (r = -0,356; p = 0,024) e citoplasmática do Twist (r = -0,336; p = 0,034) nos CCELI. Conclusões: A expressão da PDPN está inversamente relacionada com o Twist em CCELI, além de demonstrar que ambas proteínas estão associadas com um pior padrão de invasão nos CCELI e CCELO. Também, levantou-se a hipótese de que a relação da PDPN com o Twist em CCELI e CCELO possa estar mais envolvida com uma transição parcial do fenótipo epitelial para o mesenquimal do que uma transição completa coordenada pela PDPN. / Introduction: Oral Squamous Cell Carcinoma (OSCC) is a major public health problem worldwide. It is believed that the mechanism responsible for tumor progression is based on collective invasion of cell groups or individual cells, called Epithelial-Mesenchymal Transition (EMT), where there is a decrease in the expression of epithelial biomarkers and increased expression of mesenchymal biomarkers as Twist. Podoplanin (PDPN), a transmembrane glycoprotein, is assumed to be involved in the motility of neoplastic cells that are undergoing through EMT to guide the cell complex during an invasion. Objective: To perform a comparative analysis of the immunoexpression of PDPN and Twist among 40 cases of lower lip CCEs and 36 cases of oral tongue, (primary tumor size, regional and distal lymph node metastasis, clinical staging, histological grade of malignancy and histological pattern of invasion). Methods: To evaluate the histopathological grade of malignancy, the system proposed by Brandwein-Gensler et al. (2005) was used. For the two markers, four types of immunohistochemical analysis were performed: analysis of the invasion front, tumor compressive areas, large tumor islands (> 15 neoplastic cells) and nests/dissociated cells (<15 neoplastic cells). The non-parametric Mann-Whitney test was used for the analysis of the relationships between the clinical and histopathological parameters and the PDPN and Twist immunoexpressions. To verify possible correlations between the PDPN and Twist immunoexpressions, the Spearman (r) correlation test was performed. For all statistical tests, a significance level of 5% (p <0.05) was established. Results: No statistically significant differences were found between PDPN and Twist immunoexpression and tumor size, metastasis, and clinical staging on lower lip SCC (p > 0.05). However, statistically significant differences were found between the cytoplasmic immunoexpression of PDPN and the invasion patterns type 4 and 5 (p = 0.032) of Brandwein-Gensler et al. (2005). Also, no statistically significant differences were found between PDPN and Twist immunoexpression and tumor size, metastasis and clinical staging on oral tongue SCC (p > 0.05). Statistically significant differences were observed between the cytoplasmic (p = 0.006), membrane (p = 0.030) and general (p = 0.025) PDPN expression in oral tongue SCC with the invasion patterns type 4 and 5 of Brandwein-Gensler et al. (2005). In addition, the Spearman correlation test demonstrated statistically significant negative correlations between PDPN membrane expression and Twist general expression (r = -0.356, p = 0.024) and Twist cytoplasmic expression (r = -0.336; p = 0.034) in the lower lip SCCs. Conclusions: PDPN expression is inversely related to Twist in lower lip SCC, it was demonstrated that both proteins are associatved with a worse invasion pattern in SCC. It has also been hypothesized that the relationship of PDPN with Twist in OSCC may be more involved with a partial transition from the epithelial to the mesenchymal phenotype than a complete transition coordinated by PDPN.