title: [Gallbladder carcinoma: expression of the c-myc and ras-p-21 oncogene products].
abstract: The expression of c-myc and p-ras-21 oncogenes was studied using an immunohistochemical method with monoclonal antibodies in 126 samples of gallbladder carcinoma (103 primary tumors and 23 metastatic lesions). Twenty five gallbladder samples without tumor evidence were used as controls. C-myc oncoprotein was positive in one control sample and p-ras-21 oncoprotein was negative in all. Among primary carcinomas c-myc was positive in 9 (9%) and p-ras-21 in 4 (4%); among metastatic carcinomas c-myc was positive in 6 (26%, p = 0.03 vs primary carcinoma) and p-ras-21 in 11 (48%, p < 0.001 vs primary carcinoma). There was a non significant association between c-myc and p-ras-21 expression and degree of histological differentiation and level of tumoral infiltration. It is concluded that c-myc and p-ras-21 oncoprotein expression is observed in less than 10% of primary gallbladder carcinomas and that this expression is significantly higher in metastatic carcinomas. This may reflect an activation or overexpression of these oncogenes in metastatic cells.
authors.affiliation: Unidad de Anatomía Patológica y Citopatología, Facultad de Medicina, Universidad de La Frontera, Hospital Regional de Temuco, Chile.
authors.forename: I
authors.initials: I
authors.lastname: Roa
authors.forename: J C
authors.initials: JC
authors.lastname: Araya
authors.forename: T
authors.initials: T
authors.lastname: Shiraishi
authors.forename: R
authors.initials: R
authors.lastname: Yatani
authors.forename: I
authors.initials: I
authors.lastname: Wistuba
authors.forename: M
authors.initials: M
authors.lastname: Villaseca
authors.forename: X
authors.initials: X
authors.lastname: de Aretxabala
mesh_terms: D000595:Amino Acid Sequence; D005706:Gallbladder Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D015870:Gene Expression; D006801:Humans; D008969:Molecular Sequence Data; D009362:Neoplasm Metastasis; D016271:Proto-Oncogene Proteins c-myc / Q000096:biosynthesis*; D016283:Proto-Oncogene Proteins p21(ras) / Q000096:biosynthesis*
chemical_list: D016271:Proto-Oncogene Proteins c-myc; C501009:HRAS protein, human; D016283:Proto-Oncogene Proteins p21(ras)
vernacular_title: Carcinoma de la vesícula biliar: expresión de productos de los oncogenes c-myc y ras-p-21.