High cyclooxygenase-2 expression following neoadjuvant radiochemotherapy is associated with minor histopathologic response and poor prognosis in esophageal cancer.
Clin Cancer Res
; 11(23): 8341-7, 2005 Dec 01.
Article
em En
| MEDLINE
| ID: mdl-16322294
ABSTRACT
PURPOSE:
High expression of cyclooxygenase-2 (COX-2) was shown to inhibit chemotherapy- and radiotherapy-induced apoptosis. We analyzed the association of COX-2 mRNA and protein expression with histomorphologic response to neoadjuvant radiochemotherapy in esophageal cancer. EXPERIMENTALDESIGN:
Fifty-two patients with resectable esophageal cancers (cT2-4, Nx, and M0) received neoadjuvant radiochemotherapy (cisplatin, 5-5-fluorouracil, 36 Gy) followed by transthoracic en bloc esophagectomy. Histomorphologic regression was defined as major response when resected specimens contained less than 10% of residual vital tumor cells. RNA was isolated from endoscopic biopsies (paired tumor and normal tissue) before neoadjuvant treatment and quantitative real-time reverse transcriptase-PCR (Taqman) assays were done to determine COX-2 mRNA expression levels standardized for beta-actin. COX-2 protein expression in pretreatment biopsies and post-therapeutic resection specimens was analyzed by immunostaining of tumor cells.RESULTS:
Median COX-2 mRNA expression levels were significantly (P < 0.0001) different between paired tumor (median, 2.2) and normal tissues (median, 0.159). Comparison of pre-therapeutic and posttherapeutic specimens showed a significant difference (P < 0.006) in COX-2 protein expression. Twelve of 52 tumors showed down-regulation and 3 of 52 showed up-regulation of COX-2 protein expression during neoadjuvant radiochemotherapy. High COX-2 protein expression in post-therapeutic resection specimens was significantly associated with minor histopathologic response (P < 0.04) and poor prognosis (5-year survival probabilities 26.3 +/- 8.2% for minor and 58.6% +/- 12.9% for major histopathologic response; P < 0.01).CONCLUSION:
High COX-2 protein expression following neoadjuvant radiochemotherapy in resection specimens is significantly associated with minor histopathologic response to neoadjuvant therapy and very poor prognosis.
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Base de dados:
MEDLINE
Assunto principal:
Neoplasias Esofágicas
/
Regulação Enzimológica da Expressão Gênica
/
Terapia Neoadjuvante
/
Ciclo-Oxigenase 2
Tipo de estudo:
Observational_studies
/
Prognostic_studies
/
Risk_factors_studies
Limite:
Adult
/
Aged
/
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
Clin Cancer Res
Assunto da revista:
NEOPLASIAS
Ano de publicação:
2005
Tipo de documento:
Article
País de afiliação:
Alemanha