title: Genetic expression profiles and chromosomal alterations in sporadic breast cancer in Mexican women.
abstract: Breast cancer is the second-leading cause of death among Mexican women >35 years of age. At the molecular level, changes in many genetic pathways have been reported to be associated with this neoplasm. To analyze these changes, we determined gene expression profiles and chromosomal structural alterations in tumors from Mexican women. We obtained mRNA to identify expression profiles with microarray technology, and DNA to determine amplifications and deletions, in 10 fresh sporadic breast tumor biopsies without treatment, as well as in 10 nonaffected breast tissues. Expression profiles were compared with genetic changes observed by comparative genomic hybridization (CGH). We compared the expression profiles against the structural alterations from the studied genes by means of microarrays; at least 17 of these genes correlated with DNA copy number alterations. We found that the following genes were overexpressed: LAMC1, PCTK3, CCNC, CCND1, FGF3, PCTK2, L1CAM, BGN, and PLXNB3 (alias PLEXR). Underexpressed genes included CASP9, FGR, TP73, HSPG2, and ERCC1; genes turned off included FRAP1, EPHA2 (previously ECK), IL12A, E2F5, TNFRSF10B, TNFRSF10A, EFNB3, and BCL2. The results will allow us, in the near future, to outline genes that could serve as diagnostic, prognostic, or target therapy markers for the Mexican population.
authors.affiliation: Molecular Genetics Laboratory, Medical Research Unit, Pediatric Hospital, Centro Médico Nacional Siglo XXI (CMN-SXXI), Instituto Mexicano del Seguro Social (IMMS), Col Doctores, CP 06720, Del Cuauhtémoc, Mexico City, Mexico.
authors.forename: Adán
authors.initials: A
authors.lastname: Valladares
authors.forename: Normand García
authors.initials: NG
authors.lastname: Hernández
authors.forename: Fabio Salamanca
authors.initials: FS
authors.lastname: Gómez
authors.forename: Everardo
authors.initials: E
authors.lastname: Curiel-Quezada
authors.forename: Eduardo
authors.initials: E
authors.lastname: Madrigal-Bujaidar
authors.forename: Ma Dolores
authors.initials: MD
authors.lastname: Vergara
authors.forename: Mónica Sierra
authors.initials: MS
authors.lastname: Martínez
authors.forename: Diego J
authors.initials: DJ
authors.lastname: Arenas Aranda
mesh_terms: D000328:Adult; D000368:Aged; D001943:Breast Neoplasms / Q000235:genetics*; D002869:Chromosome Aberrations; D005260:Female; D020869:Gene Expression Profiling; D006801:Humans; D008800:Mexico; D008875:Middle Aged; D009693:Nucleic Acid Hybridization / Q000379:methods; D020411:Oligonucleotide Array Sequence Analysis