Tissue microarray analysis of signal transducers and activators of transcription 3 (Stat3) and phospho-Stat3 (Tyr705) in node-negative breast cancer shows nuclear localization is associated with a better prognosis.
Clin Cancer Res
; 9(2): 594-600, 2003 Feb.
Article
en En
| MEDLINE
| ID: mdl-12576423
ABSTRACT
PURPOSE:
Although a high frequency of tumors contain constitutively activated signal transducers and activators of transcription 3 (Stat3), its relationship to breast cancer and patient survival has not been determined in a large retrospective study of node-negative tumors. To further elucidate the role of Stat3 in breast cancers, the expression patterns of Stat3 and Phospho-tyrosine residue 705 (Tyr705) Stat3 were correlated with survival outcome and clinicopathological parameters in a large cohort of node-negative breast cancer tumors. EXPERIMENTALDESIGN:
Immunohistochemical analysis of Stat3 and Phospho-Stat3 was performed on a breast cancer tissue microarray of 346 node-negative breast cancer specimens. These results were correlated with overall survival and other clinicopathological data.RESULTS:
Positive Stat3 cytoplasmic expression was seen in 69.2% of tumors, and positive Phospho-Stat3 (Tyr705) cytoplasmic expression was seen in 19.6% of tumors. Neither cytoplasmic expression showed significant association with survival or other clinical parameters. However, 23.1% of tumors had positive Stat3 nuclear expression, and those patients had a significantly improved short-term survival (P = 0.0332) at 5 years of follow-up. Upon analysis of positive Phospho-Stat3 (Tyr705) nuclear expression, seen in 43.5% of tumors, positive tumors had a significantly improved survival at both short-term 5-year survival (P = 0.0054) and long-term 20-year (P = 0.0376) survival analysis. Additionally, positive Phospho-Stat3 (Tyr705) nuclear expression is an independent prognostic marker of better overall survival node-negative breast cancer by multivariate analyses that included the variables of nuclear grade, Ki-67, estrogen receptor staining, progesterone receptor staining, Her2 staining, age, and tumor size.CONCLUSIONS:
These findings support a role for Stat3 and Phospho-Stat3 (Tyr705) overexpression in node-negative breast cancer and provide initial evidence that Phospho-Stat3 (Tyr705) may be a marker for improved overall survival independent of other prognostic markers.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Neoplasias de la Mama
/
Transactivadores
/
Fosfotirosina
/
Proteínas de Unión al ADN
Tipo de estudio:
Observational_studies
/
Prognostic_studies
/
Risk_factors_studies
Límite:
Female
/
Humans
Idioma:
En
Revista:
Clin Cancer Res
Asunto de la revista:
NEOPLASIAS
Año:
2003
Tipo del documento:
Article
País de afiliación:
Estados Unidos