title: Review article: pulmonary sarcomatoid carcinomas: a practical overview.
abstract: Pulmonary sarcomatoid carcinomas (PSCs) are currently defined as poorly differentiated non-small-cell carcinomas containing a component with sarcoma or sarcoma-like (spindle and/or giant cell) features. They consist of 5 major histological variants, namely pleomorphic carcinoma, spindle cell carcinoma, giant cell carcinoma, carcinosarcoma, and pulmonary blastoma. The segregation of PSCs into a distinct clinicopathologic entity seems justified on the basis of morphologic, behavioral, and genotypic/phenotypic attributes. As a group, PSCs generally run an aggressive clinical course and may cause major difficulties in the differential diagnosis with other primary and secondary malignancies of the lung. At present, PSCs are believed to represent a family of carcinomas "in transition," in which diverse pathways of clonal evolution account for histological differences of a common ancestor lesion. The sarcomatous or sarcomatoid component of these tumors is thought to derive from carcinoma cells during the progression of carcinogenesis through the activation of an epithelial-mesenchymal transition program leading to sarcomatous transformation or metaplasia (conversion paradigm). Conceivably, targeting the epithelial-mesenchymal transition program could become a valid therapeutic strategy for these life-threatening tumors, whose sensitivity to current medical manipulation is disappointing.
authors.affiliation: Division of Pathology and Laboratory Medicine, University of Milan School of Medicine, Milan. giuseppe.pelosi@ieo.it
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Pelosi
authors.forename: Angelica
authors.initials: A
authors.lastname: Sonzogni
authors.forename: Tommaso
authors.initials: T
authors.lastname: De Pas
authors.forename: Domenico
authors.initials: D
authors.lastname: Galetta
authors.forename: Giulia
authors.initials: G
authors.lastname: Veronesi
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Spaggiari
authors.forename: Michela
authors.initials: M
authors.lastname: Manzotti
authors.forename: Caterina
authors.initials: C
authors.lastname: Fumagalli
authors.forename: Enrica
authors.initials: E
authors.lastname: Bresaola
authors.forename: Oscar
authors.initials: O
authors.lastname: Nappi
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Viale
authors.forename: Juan
authors.initials: J
authors.lastname: Rosai
mesh_terms: D014408:Biomarkers, Tumor / Q000032:analysis; D002277:Carcinoma / Q000737:chemistry / Q000473:pathology*; D018286:Carcinoma, Giant Cell / Q000737:chemistry / Q000473:pathology*; D002296:Carcinosarcoma / Q000737:chemistry / Q000473:pathology*; D006801:Humans; D008175:Lung Neoplasms / Q000737:chemistry / Q000473:pathology*; D009378:Neoplasms, Multiple Primary; D018202:Pulmonary Blastoma / Q000737:chemistry / Q000473:pathology*; D012509:Sarcoma / Q000737:chemistry / Q000473:pathology*
chemical_list: D014408:Biomarkers, Tumor