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- W2035812199 abstract "Giant cell carcinoma of the lung (GCCL) is an uncommon and extremely aggressive variant of lung cancer. Characteristic microscopic findings include marked pleomorphism, aggregates of mononucleated or multinucleated giant cells (or both), a general lack of architectural cohesiveness, extensive necrosis, and endocytosis by the giant cells. Although the epithelial character of GCCL has been confirmed by a number of studies, controversy persists as to whether it represents a variant of poorly differentiated adenocarcinoma or of squamous carcinoma. Histochemical studies for mucosubstances have yielded variable and conflicting results. This report describes conventionally fixed and processed samples from 10 cases of GCCL studied with a panel of monoclonal antibodies (Mabs) recognizing different cytokeratin polypeptides (AE1, AE3, AE1/AE3 cocktail, and CAM 5.2), vimentin, and Mab A-80, the last of which binds to a mucinous glycoprotein associated with exocrine differentiation. All 10 cases of GCCL reacted with all cytokeratin Mabs; the extent and intensity of the reaction varied notably. All cases stained strongly and diffusely with Mab AE1 and AE1/AE3, the reaction was less extensive and weaker with CAM 5.2. Significantly, 2 cases reacted focally with Mab AE3. Nine cases reacted extensively and intensely with the vimentin Mab, often showing prominent paranuclear globular profiles. All cases reacted with Mab A-80; the reaction was often strong, but the extent was variable. Findings indicate that all GCCL are indeed cytokeratin positive but that most express polypeptides toward the low-molecular weight end of the spectrum; a small subset also expresses heavier polypeptides. This profile suggests that all GCCL display cytokeratins characteristic of adenocarcinoma but that a subset also shows polypeptides typical of squamous carcinomas; significantly, all GCCL retained their exocrine phenotype as defined by their positivity with Mab A-80. Moreover, the consistent if not invariable finding of vimentin positivity adds to an immunohistochemical profile that is distinct from that of the vast majority of lung cancers." @default.
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- W2035812199 date "1991-01-01" @default.
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- W2035812199 title "Immunohistochemical Features of Giant Cell Carcinoma of the Lung: Patterns of Expression of Cytokeratins, Vimentin, and the Mucinous Glycoprotein Recognized by Monoclonal Antibody A-80" @default.
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- W2035812199 doi "https://doi.org/10.3109/01913129109016231" @default.
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