Bcl-2, bax and p53 expression in rectal adenocarcinoma. Correlation with classic pathologic prognostic factors and patients' outcome.
In Vivo
; 21(1): 113-8, 2007.
Article
em En
| MEDLINE
| ID: mdl-17354623
ABSTRACT
BACKGROUND:
Bcl-2 oncoprotein inhibits apoptosis, whereas bax protein promotes apoptosis by enhancing cell susceptibility to apoptotic stimuli. This study examined the bcl-2, bax and p53 expression in rectal adenocarcinomas and their relationship with tumor prognosis. PATIENTS ANDMETHODS:
Paraffin-embedded 4-microm tumor sections obtained from patients with rectal adenocarcinoma who underwent colectomy for therapeutic reasons, were analyzed with a standard streptavidin biotin peroxidase method, using polyclonal and monoclonal antibodies. Patients were followed up for 1.5-83 (mean +/- SD 47.19 +/- 6.2) months.RESULTS:
Positive immunoreactivity for bcl-2, bax and p53 was detected in 21 (37%), 28 (50%) and 45 (80%) tumors, respectively. Bax was co-expressed in 17 out of 21 bcl-2(+) cases, whereas p53 was co-expressed in 18 out of 21 bcl-2(+) and 17 out of 28 bax(+) cases. Loss of bax expression was associated with advanced stage and high grade tumors (p < 0.01). Local (n = 6) or distant (n = 5) tumor recurrence was established in 11 cases. All these cases were bax(+), bcl-2(-) and p53(+). Bax and p53 expressions were correlated with adverse outcome (p < 0.05) while bcl-2 presence did not influence survival. Bcl-2(-)/bax(+)/p53(+) cases showed lower survival than bax(+)/bcl-2(+)/p53(+) cases (p < 0.001).CONCLUSION:
In rectal adenocarcinoma, bax and bcl-2 proteins co-express frequently with p53. Co-expression of bax with p53 protein is associated with poor clinical outcome, especially in cases without concomitant expression of bcl-2.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Neoplasias Retais
/
Adenocarcinoma
/
Proteína Supressora de Tumor p53
/
Proteínas Proto-Oncogênicas c-bcl-2
/
Proteína X Associada a bcl-2
Tipo de estudo:
Diagnostic_studies
/
Observational_studies
/
Prognostic_studies
/
Risk_factors_studies
Limite:
Adult
/
Aged
/
Female
/
Humans
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Male
/
Middle aged
Idioma:
En
Ano de publicação:
2007
Tipo de documento:
Article