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Background and Aim: Hepatocellular carcinoma (HCC) is one of the most common cancers worldwide. Recently, abnormal activation of the Wnt pathway has been found to be involved in the carcinogenesis of HCC. However, the relationship between genetic changes in the Wnt pathway–associated genes and its protein expression has not been studied in patients with HCC and cirrhotic nodules. The purpose of this study is to explore the contribution of inappropriate activation of the Wnt pathway in liver carcinogenesis. Methods: Somatic mutation in exons 3–5 of AXIN1 and exon 3 of β-catenin were analyzed by direct sequencing and expression of axin and β-catenin proteins by immunohistochemistry in a series of 36 patients with HCC and cirrhosis. Results: The AXIN1 and β-catenin gene mutations were observed in 25% (9/36) and 2.8% (1/36) of HCCs, respectively. All mutations detected in AXIN1 and β-catenin genes were missense point mutations. Abnormal nuclear expression of β-catenin was observed in 11 of 36 cases of HCCs (30.6%), but not in cirrhotic nodules. Reduced or absent expression of axin was seen in 24 of 36 HCCs (66.7%). The abnormal expression of β-catenin and axin proteins was closely correlated with mutations of AXIN1 and β-catenin ( P < 0.0001 and P = 0.008, respectively). Conclusions: These data suggest that mutation of AXIN1 gene is a frequent and late event for HCC associated with cirrhosis, and is correlated significantly with abnormal expression of axin and β-catenin. Therefore, activation of Wnt signaling through AXIN1 rather than β-catenin mutation might play an important role in liver carcinogenesis. [ABSTRACT FROM AUTHOR]

Background: Multiple primary carcinomas are increasingly being found because of the development of diagnostic techniques and the increasing incidence of early stage carcinoma. The purpose of this study was to determine the prevalence and clinicopathological features of gastric carcinoma patients with other primary carcinomas. Methods: There were 65 (incidence 2.6%) gastric carcinoma patients with other primary carcinomas compared with 2,444 patients with gastric carcinoma alone. Results: Associated primary carcinomas were often found in the gastrointestinal (GI) tract, especially in the colon (33.8%). In patients with gastric carcinoma only, poorly differentiated adenocarcinoma was the most common (43.2%), followed by moderately and well-differentiated adenocarcinoma. Similarly, poorly differentiated adenocarcinoma (33.8%) was also the prevalent histological type in gastric carcinoma patients with other primary carcinomas, although its incidence was lower. The stage of gastric carcinoma did not differ between the two groups. The estimated 5-year survival rate was 51.6% for patients with gastric carcinoma alone, and 50.7% for those with other primary carcinomas; the difference was not significant (P=0.82). Conclusion: Gastric carcinoma should be treated aggressively, since the prognosis of gastric carcinoma patients treated for other primary carcinomas is not poorer than that of patients treated for gastric carcinoma alone. [ABSTRACT FROM AUTHOR]