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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Gene product immunophenotyping of neuroendocrine lung tumors. No linking evidence between carcinoids and small-cell lung carcinomas suggested by multivariate statistical analysis.
Fifty-three neuroendocrine lung tumors (24 carcinoids, one atypical carcinoid, five large-cell neuroendocrine carcinomas, and 23 small-cell lung carcinomas) were investigated for immunocytochemical expression of several gene products, i.e., p53, Rb, bcl-2, c-kit, mdm-2, cdk-4, p21 proteins, and proliferation index as assessed by MIB-1. The goal of the study was to explore the relationships between histotypes in light of their own gene product-based immunophenotypical profiles. To this aim we applied the multiple correspondence analysis, which is an exploratory statistical multivariate technique that converts a data matrix into a particular type of graphic display in which the rows and columns are depicted as points. Such statistical analysis displayed that some categories of the gene product-based immunophenotyping variables are grouped in the plot identifying three groups: the first group related to carcinoids, the second to small-cell carcinomas, and the third to large-cell neuroendocrine carcinomas. These data support the evidence that carcinoids and small-cell carcinomas are two distinct, apparently immunogenotypically unrelated entities among neuroendocrine lung tumors and that atypical carcinoids and large-cell neuroendocrine carcinomas seem not to represent intermediate steps between them.
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