Specific expression of ZO-1 and N-cadherin in rosette structures of various tumors: possible recapitulation of neural tube formation in embryogenesis and utility as a potentially novel immunohistochemical marker of rosette formation in pulmonary neuroendocrine tumors.

Neuroendocrine tumors can develop in various organs. All of these tumors are designated on the basis of their morphologic characteristics evident by light microscopy, and by immunohistochemistry for antigens such as synaptophysin, chromogranin-A, and CD56/NCAM. In the present study, we attempted to demonstrate the localization of Zonula occludens-1 (ZO-1) and N-cadherin in rosette structures of neuroendocrine tumors using immunohistochemistry and to clarify their specific distribution in rosettes in human pulmonary neuroendocrine tumors in comparison with various types of adenocarcinoma.

Expression of the GA733 gene family and its relationship to prognosis in pulmonary adenocarcinoma.

The GA733 gene family is composed of GA733-1 (TROP2) and GA733-2 (Ep-CAM), whose expression has been examined in various carcinomas and reported to be significantly associated with prognosis. The aim of this study was to investigate the expression of GA733 gene family members and to compare their prognostic significance in pulmonary adenocarcinoma. One hundred thirty paraffin-embedded specimens of small-sized pulmonary adenocarcinoma, less than 2 cm in diameter, were categorized using the classification of small-sized pulmonary adenocarcinoma devised by Noguchi et al.