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Nari Shin, Hye Yeon Kim, Woo Kyung Kim, Min Gyung Park, Kyung Bin Kim, Dong Hoon Shin, Kyung Un Choi, Jee Yeon Kim, Chang Hun Lee, Gi Young Huh, Mee Young Sol, Do Youn Park
BACKGROUND It is clear that the biologic characteristics of gastric cancer are different on the basis of mucin phenotypes. However, there are unabated controversies on the exact biologic differences of mucin expression in gastric cancer. METHODS We analyzed various protein expressions and microsatellite instability (MSI) status based on mucin expression in 130 differentiated early gastric adenocarcinoma cases. Furthermore, we evaluated the genomic alternation in 10 selected differentiated early gastric adenocarcinoma cases using array based comparative genomic hybridization (aCGH). RESULTS Intestinal mucin predominant subtype showed significantly elevated p53 protein and caudal-related homeobox 2 expression, and delocalization of beta catenin expressions compared to the gastric mucin predominant subtype. On MSI status, the gastric mucin predominant subtype more frequently showed unstable status than the intestinal mucin predominant subtype. CGH study showed more frequent chromosomal gain and loss in the intestinal mucin predominant subtype than the gastric mucin predominant subtype, albeit without statistical significance.
Interestingly, there were significant differences in chromosomal alternation between four mucin phenotypes. CONCLUSIONS Study results suggest possible different points of biologic behaviors in early differentiated gastric adenocarcinomas by mucin expression type.
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Mucin Expression in Gastric Cancer: Reappraisal of Its Clinicopathologic and Prognostic Significance Dae Hwan Kim, Nari Shin, Gwang Ha Kim, Geum Am Song, Tae-Yong Jeon, Dong-Heon Kim, Gregory Y. Lauwers, Do Youn Park Archives of Pathology & Laboratory Medicine.2013; 137(8): 1047. CrossRef
Microsatellite Instability Status in Gastric Cancer: A Reappraisal of Its Clinical Significance and Relationship with Mucin Phenotypes Joo-Yeun Kim, Na Ri Shin, Ahrong Kim, Hyun-Jeong Lee, Won-young Park, Jee-Yeon Kim, Chang-Hun Lee, Gi-Young Huh, Do Youn Park Korean Journal of Pathology.2013; 47(1): 28. CrossRef
BACKGROUND The monoclonal antibody M30 recognizes a neoepitope of cytokeratin 18 that's produced during the process of apoptosis, and it is reactive in formalin-fixed, paraffin-embedded tissue. The detailed nature of apoptosis in colorectal cancer is unclear, especially in regard to the MSI status and the clinicopathologic factors. The purpose of this study was to elucidate the apoptosis assessed by M30 immunoreactivity in colorectal cancer and its relationship with the MSI status and the various clinicopathologic factors of colorectal cancers. METHODS 101 colorectal cancers were classified according to levels of MSI as 12 MSI-H, 4 MSI-L and 85 MSS. Apoptosis was quantified by immunohistochemistry with using M30 CytoDEATH anti-body. RESULTS The apoptotic index assessed by M30 was significantly increased in the MSI-H and MSI-L colorectal cancer compared to that in the MSS colorectal cancer. Right sided colon cancer showed a significant higher apoptotic index than did the left sided colon cancer. There was also a tendency for decreased apoptosis in metastatic colorectal cancers (Duke's stage D). There was somewhat of an increase of apoptosis in colorectal cancers with mucinous carcinoma and medullary carcinoma, and also in the colorectal cancers with an increased TIL count, but this was not statistically significant. CONCLUSION M30 immunoreactivity is a valuable method to detect apoptosis in formalin-fixed, paraffin-embedded tissue and it might explain that MSI-H colorectal cancer shows better clinical behavior than MSS colorectal cancer in regard to the increased apoptosis.