%0 Journal Article
%T Molecular Analyses of Early-Onset Gastric Cancer in Brazilian Patients: <i>TP</i>53 Mutations, Cadherin-Catenin and Mucins Proteins Expression
%A Edaise Maria da Silva
%A Jos¨¦ Humberto Tavares Guerreiro Fregnani
%A Ghyslaine Martel
%A Wilson Luiz Costa Jr.
%A Felipe Jos¨¦ Fern¨¢ndez Coimbra
%A Maria Isabel Waddington Achatz
%A Pierre Hainaut
%A Fernando Augusto Soares
%J Journal of Cancer Therapy
%P 33-42
%@ 2151-1942
%D 2013
%I Scientific Research Publishing
%R 10.4236/jct.2013.41A005
%X <p class=\"MsoNormal\">
	<span lang=\"EN-US\">Early gastric carcinomas may develop with a molecular profile differing from sporadic carcinomas occurring at a later age. In this study, we analyzed a retrospective series of 88 patients with gastric adenocarcinoma diagnosed before the age of 45 years for the presence of <i>TP</i>53 mutations, clinicopathological features and immunohistochemistry to evaluate the expression of markers considered to be important in gastric carcinogenesis (E-cadherin, <i>¦Â</i>-catenin, MUC1, MUC2, MUC<!--?xml:namespace prefix = st1 /--><?xml:namespace prefix = st1 /><st1:chmetcnv tcsc=\"0\" numbertype=\"1\" negative=\"False\" hasspace=\"False\" sourcevalue=\"5\" unitname=\"ac\" w:st=\"on\">5AC</st1:chmetcnv>, MUC6 and p53).</span><span lang=\"EN-US\"> </span><span lang=\"EN-US\">The majority of proportion of tumors were diffuse-type (70%) and advanced stage (56%). Familial history of cancer was positive in 21% of the cases. There was a significant association between altered expres</span><span lang=\"EN-US\">sion of E-cadherin and <i>¦Â</i>-catenin, and between p53 expression and perineural invasion. <i>TP</i>53 mutations were detected in 14.5% of evaluated cases, including a germline mutation (p.R337H) in a 12-year old patient. Overall survival analysis showed significant differences in relation with tumor stage and histopathology. The evaluated biomarkers did not pre</span><span lang=\"EN-US\">sent prognostic value in non-exploratory multivariate analyses.</span><span lang=\"EN-US\"> </span><span lang=\"EN-US\">The low frequency of <i>TP</i>53<i> </i>mutations in this series suggests these alterations are not a major molecular event in gastric cancer occurring at early age, although the identifi</span><span lang=\"EN-US\">cation of a case with germline p.R337H mutation is consistent with the hypothesis that a small proportion of early, ap</span><span lang=\"EN-US\">parently sporadic gastric cancer, may be associated with widespread Brazilian founder mutations. Further studies are needed to evaluate the prognostic significance of markers for specific groups of patients according to tumor histology and familial history.</span><span lang=\"EN-US\"><!--?xml:namespace prefix = o /--><?xml:namespace prefix = o /><o:p></o:p></span> 
</p>
%K Early-Onset
%K Gastric Cancer
%K Young Patients
%K Cellular Adhesion
%K TP53 Mutations
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=26452