title: Association of the p53 codon 72 polymorphism with clinicopathological characteristics of colorectal cancer through mRNA analysis.
abstract: TP53 represents a suitable candidate for a colorectal cancer susceptibility locus. The polymorphism in the p53 72nd codon involves a proline to arginine substitution, leading to changes in gene transcription activity, interaction with other proteins and modulation of apoptosis. Studies evaluating the association between this polymorphism and colorectal cancer (CRC) have shown inconsistent results, and none have evaluated the mRNA status of TP53. The aim of the present study was to evaluate the association between this SNP expression at the mRNA level in CRC samples and patient clinicopathological variables and prognosis, p53 protein expression and TP53 mutation. This is the first report to describe the mRNA expression of p53 codon 72 alleles in CRC. We evaluated 101 non-related patients with CRC treated at the A.C. Camargo Cancer Center in Brazil. RNA was isolated from frozen tumor tissues using a trizol-based protocol. The polymorphism was detected using RT-PCR followed by Sanger sequencing. Associations were analyzed using Pearson's Chi-square or Fisher's exact tests, logistic regression and Cox. This polymorphism was significantly associated with clinicopathological variables related to increased tumor aggressiveness. The expression of Arg72 (OR, 3.83; CI 1.02-14.35; P=0.046) and the TNM stage (OR, 7.15; CI 1.45-35.29; P=0.016) were found to be independent predictors for recurrence. These data suggest that the mRNA expression of the Pro72 allele is associated with less favorable tumor features. The allele frequency of the p53 Pro72 was 0.26. The analysis of mRNA is important to determine the specific contribution of the allele expressed. These results suggest that this polymorphism may play a role in CRC.
authors.affiliation: Department of Anatomic Pathology, International Center for Research (CIPE) in Oncology, A.C. Camargo Cancer Center, São Paulo, SP, CEP 01508-010, Brazil.
authors.forename: Ligia Petrolini
authors.initials: LP
authors.lastname: De Oliveira
authors.affiliation: Department of Biochemistry, Faculty of Science, Universidad de la República, Montevideo CEP 11400, Uruguay.
authors.forename: Ignacio
authors.initials: I
authors.lastname: López
authors.affiliation: Department of Anatomic Pathology, International Center for Research (CIPE) in Oncology, A.C. Camargo Cancer Center, São Paulo, SP, CEP 01508-010, Brazil.
authors.forename: Erika Maria Monteiro
authors.initials: EM
authors.lastname: Dos Santos
authors.affiliation: Department of Biochemistry, Faculty of Science, Universidad de la República, Montevideo CEP 11400, Uruguay.
authors.forename: Paula
authors.initials: P
authors.lastname: Tucci
authors.affiliation: Department of Biochemistry, Faculty of Science, Universidad de la República, Montevideo CEP 11400, Uruguay.
authors.forename: Mónica
authors.initials: M
authors.lastname: Marín
authors.affiliation: Department of Anatomic Pathology, International Center for Research (CIPE) in Oncology, A.C. Camargo Cancer Center, São Paulo, SP, CEP 01508-010, Brazil.
authors.forename: Fernando Augusto
authors.initials: FA
authors.lastname: Soares
authors.affiliation: Department of Anatomic Pathology, International Center for Research (CIPE) in Oncology, A.C. Camargo Cancer Center, São Paulo, SP, CEP 01508-010, Brazil.
authors.forename: Benedito Mauro
authors.initials: BM
authors.lastname: Rossi
authors.affiliation: Department of Anatomic Pathology, International Center for Research (CIPE) in Oncology, A.C. Camargo Cancer Center, São Paulo, SP, CEP 01508-010, Brazil.
authors.forename: Renata De Almeida
authors.initials: Rde A
authors.lastname: Coudry
mesh_terms: D000230:Adenocarcinoma / Q000235:genetics* / Q000378:metabolism / Q000401:mortality; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003062:Codon; D015179:Colorectal Neoplasms / Q000235:genetics* / Q000378:metabolism / Q000401:mortality; D004252:DNA Mutational Analysis; D005260:Female; D015870:Gene Expression; D005787:Gene Frequency; D056726:Genetic Association Studies; D020022:Genetic Predisposition to Disease; D006801:Humans; D053208:Kaplan-Meier Estimate; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009364:Neoplasm Recurrence, Local / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide; D011379:Prognosis; D016016:Proportional Hazards Models; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D016159:Tumor Suppressor Protein p53 / Q000235:genetics* / Q000378:metabolism
chemical_list: D003062:Codon; D012333:RNA, Messenger; C495901:TP53 protein, human; D016159:Tumor Suppressor Protein p53