title: Proteomic analysis distinguishes basaloid carcinoma as a distinct subtype of nonsmall cell lung carcinoma.
abstract: The histopathologic type of lung cancer is known to be correlated with tumor behavior and prognosis. However, this classification is subjective and no specific molecular markers have been identified. The aim of this study was to identify protein markers in different types of nonsmall cell lung cancers. Two-dimensional polyacrylamide gel electrophoresis analysis was performed with paired samples of three squamous cell carcinomas, three adenocarcinomas, four large cell carcinomas, and four basaloid carcinomas. We found that 25 proteins in 14 cases of lung cancer were differentially expressed compared to matched nontumorous lung tissues. Among these 25 proteins, 11 proteins were down-regulated and 14 were up-regulated in these four types of lung cancer. Alloalbumin venezia, selenium-binding protein 1, carbonic dehydratase, heat shock 20KD-like protein, and SM22 alpha protein were down-regulated in all 14 cases of lung cancer examined, whereas alpha enolase was consistently up-regulated. Supervised hierarchical cluster analysis based on the 25 differentially expressed proteins showed that basaloid carcinoma formed one independent group, whereas the other three cancer types were not uniquely classifiable. Our findings suggest that basaloid carcinoma is a unique subtype of nonsmall cell lung carcinoma.
authors.affiliation: Department of Pathology, Brain Korea 21 Projects for Medical Sciences, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Long Shan
authors.initials: LS
authors.lastname: Li
authors.forename: Hyunki
authors.initials: H
authors.lastname: Kim
authors.forename: Hwanseok
authors.initials: H
authors.lastname: Rhee
authors.forename: Se Hoon
authors.initials: SH
authors.lastname: Kim
authors.forename: Dong Hwan
authors.initials: DH
authors.lastname: Shin
authors.forename: Kyung Young
authors.initials: KY
authors.lastname: Chung
authors.forename: Kang-Sik
authors.initials: KS
authors.lastname: Park
authors.forename: Young-Ki
authors.initials: YK
authors.lastname: Paik
authors.forename: Joon
authors.initials: J
authors.lastname: Chang
authors.forename: Hoguen
authors.initials: H
authors.lastname: Kim
mesh_terms: D002289:Carcinoma, Non-Small-Cell Lung / Q000145:classification* / Q000378:metabolism* / Q000473:pathology; D015536:Down-Regulation; D006801:Humans; D008168:Lung / Q000473:pathology; D008840:Microfilament Proteins / Q000235:genetics / Q000378:metabolism; D009124:Muscle Proteins / Q000235:genetics / Q000378:metabolism; D020543:Proteome / Q000378:metabolism*; D040901:Proteomics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015854:Up-Regulation
chemical_list: D008840:Microfilament Proteins; D009124:Muscle Proteins; D020543:Proteome; C051615:transgelin