title: Clinicopathologic and immunohistochemistry characterization of synchronous multiple primary gastric adenocarcinoma.
abstract: The aim of this investigation was to evaluate clinicopathologic and immunohistochemical characteristics of synchronous primary gastric adenocarcinomas. Immunohistochemistry for p53 (suppressor pathway) and for hMLH1, hMSH2, and hMSH6 (mutator pathway) was performed using ABC-technique amplification by biotinylated tyramide. Synchronous primary gastric adenocarcinomas were detected in 19/553 (3.43%) of the patients. The tumors were localized in distal stomach in 22, body in 14, and proximal in five. There was a predominance of intestinal type in the group of synchronic tumors compared to the solitary lesions, 73.2 vs 37.3%, p = 0.001. Synchronous neoplasias were diagnosed in earlier stage than solitary neoplasias, T1-T2 = 60.9% vs T1-T2 = 28.4%, p = 0.0001; and N0 = 68.4% vs N0 = 26.2%, p = 0.001. p53 was detected in 52.6% of the patients with synchronous tumors. Altered hMLH1 immunoexpression occurred in 26.3% of the patients and hMSH6 in 5.3%. hMSH2 immunoreactivity was positive in all tumors. p53 was solely detected in 17 tumors, while hMLH1 was altered in 10/24 negative p53 tumors, p = 0.01. Synchronous gastric adenocarcinomas presented higher frequency of intestinal type and early gastric cancer in comparison to solitary gastric cancer. Two routes of carcinogenesis, mutator, and suppressor appear to be involved independently in the development of synchronous tumors.
authors: Department of Gastroenterology, University of São Paulo School of Medicine, São Paulo, São Paulo, 01327-002, Brazil. ulyssesribeiro@terra.com.br
authors: Ulysses
authors: U
authors: Ribeiro
authors: Uana M
authors: UM
authors: Jorge
authors: Adriana V
authors: AV
authors: Safatle-Ribeiro
authors: Osmar K
authors: OK
authors: Yagi
authors: Cristovam
authors: C
authors: Scapulatempo
authors: Rodrigo O
authors: RO
authors: Perez
authors: Carlos E P
authors: CE
authors: Corbett
authors: Venâncio A F
authors: VA
authors: Alves
authors: Bruno
authors: B
authors: Zilberstein
authors: Joaquim
authors: J
authors: Gama-Rodrigues
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000032:analysis; D000230:Adenocarcinoma / Q000378:metabolism* / Q000473:pathology*; D000368:Aged; D045643:DNA Repair Enzymes / Q000032:analysis; D004268:DNA-Binding Proteins / Q000032:analysis; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D000070957:MutL Protein Homolog 1; D051718:MutS Homolog 2 Protein / Q000032:analysis; D009378:Neoplasms, Multiple Primary / Q000378:metabolism* / Q000473:pathology*; D009687:Nuclear Proteins / Q000032:analysis; D013274:Stomach Neoplasms / Q000378:metabolism* / Q000473:pathology*; D016159:Tumor Suppressor Protein p53 / Q000032:analysis
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D004268:DNA-Binding Proteins; C094443:G-T mismatch-binding protein; C501486:MLH1 protein, human; D009687:Nuclear Proteins; D016159:Tumor Suppressor Protein p53; C497172:MSH2 protein, human; D000070957:MutL Protein Homolog 1; D051718:MutS Homolog 2 Protein; D045643:DNA Repair Enzymes