title: Identification of potential biomarkers for giant cell tumor of bone using comparative proteomics analysis.
abstract: Giant cell tumor of bone can be locally aggressive and occasionally can metastasize in the lungs. To identify new markers predictive of aggressive behavior, we analyzed five patients who developed lung metastasis and five who remained disease free for a minimum of 5 years. Using two-dimensional electrophoresis, we detected 28 differentially expressed spots. Fourteen spots were identified using mass spectrometry, including seven up-regulated and seven down-regulated in metastatic samples and classified according to functional categories. We then selected five proteins involved in cell cycle or apoptosis. Thioredoxin peroxidase, allograft inflammatory factor 1, and ubiquitin E2N had more than threefold up-regulation; glutathione peroxidase 1 had 1.9-fold up-regulation; and heat shock protein 27 showed down-regulation in metastatic samples with a very low P value. After validation and analysis of protein levels, evaluation of clinical impact was assessed in a much wider cohort of primary archival specimens. Immunodetection showed a higher frequency of thioredoxin peroxidase, allograft inflammatory factor 1, ubiquitin E2N, and glutathione peroxidase 1 overexpression in primary tumors that developed into lung metastases or that locally relapsed than in the disease-free group, with variable stain intensity and distribution. Kaplan-Meier analysis showed that high expression of glutathione peroxidase 1 was strongly related to local recurrence and metastasis, suggesting that its up-regulation may identify a subset of high-risk patients with giant cell tumor prone to receive diverse clinical management.
authors.affiliation: Laboratory of Experimental Oncology, Istituto Ortopedico Rizzoli, Bologna, Italy.
authors.forename: Amalia
authors.initials: A
authors.lastname: Conti
authors.forename: Gemma Caballero
authors.initials: GC
authors.lastname: Rodriguez
authors.forename: Antonella
authors.initials: A
authors.lastname: Chiechi
authors.forename: Rosa Maria Dégano
authors.initials: RM
authors.lastname: Blazquez
authors.forename: Victoria
authors.initials: V
authors.lastname: Barbado
authors.forename: Tibor
authors.initials: T
authors.lastname: Krènacs
authors.forename: Chiara
authors.initials: C
authors.lastname: Novello
authors.forename: Laura
authors.initials: L
authors.lastname: Pazzaglia
authors.forename: Irene
authors.initials: I
authors.lastname: Quattrini
authors.forename: Licciana
authors.initials: L
authors.lastname: Zanella
authors.forename: Piero
authors.initials: P
authors.lastname: Picci
authors.forename: Enrique
authors.initials: E
authors.lastname: De Alava
authors.forename: Maria Serena
authors.initials: MS
authors.lastname: Benassi
mesh_terms: D000293:Adolescent; D000328:Adult; D014408:Biomarkers, Tumor / Q000032:analysis*; D001859:Bone Neoplasms / Q000378:metabolism* / Q000473:pathology*; D005260:Female; D018212:Giant Cell Tumor of Bone / Q000378:metabolism* / Q000473:pathology*; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D009363:Neoplasm Proteins / Q000032:analysis*; D040901:Proteomics; D055815:Young Adult
chemical_list: D014408:Biomarkers, Tumor; D009363:Neoplasm Proteins