Abstract
Purpose: Wepreviously reported that protein kinase A type I (PKA RIα) overexpression was predictive of outcome in prostate cancer patients treated with radiotherapy (RT) ± short-term androgen deprivation (STAD) on Radiation Therapy Oncology Group (RTOG) protocol 86-10. Here, we attempt to verify our prior findings and test the hypothesis that the relationship of the length of AD to patient outcome is affected by PKA RIα overexpression. Experimental Design: There were 313 cases in the RTOG 92-02 study cohort with available tissue and suitable staining by immunohistochemistry. Median follow-up was 10.1 years. The intensity of PKA RIα staining intensity was quantified manually and by image analysis. Multivariate analyseswere done for overallmortality using Cox proportional hazards models and for local failure, biochemical failure, distant metastasis, and cause-specific mortality using Fine and Gray's regression models. Results: The expression levels of PKA RIα, determined bymanual and image analysis, were strongly correlated (P < 0.0001). In the multivariate analyses, manual-quantified and image analysis-quantified PKA RIα staining intensities were independent predictors of distant metastasis (P < 0.01), local failure (P < 0.05), and biochemical failure (P ≤ 0.01). Furthermore, the benefit of long-term AD over STAD was much less when PKA RIα expression was high. Conclusions: PKA RIα overexpression has been shown in two RTOG trials to be associated with an increased risk of failure after AD+ RT. In this series of contemporary high-risk patients, PKA RIα overexpression was associated with diminished response to LTAD + RT relative to STAD + RT, suggesting that such patients would be ideal for a PKA RIα knockdown strategy.
| Original language | English |
|---|---|
| Pages (from-to) | 5478-5484 |
| Number of pages | 7 |
| Journal | Clinical Cancer Research |
| Volume | 15 |
| Issue number | 17 |
| DOIs | |
| State | Published - Sep 1 2009 |
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ASJC Scopus subject areas
- Cancer Research
- Oncology
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The importance of protein kinase A in prostate cancer : Relationship to patient outcome in Radiation Therapy Oncology Group trial 92-02. / Pollack, Alan; Bae, Kyounghwa; Khor, Li Yan; Al-Saleem, Tahseen; Hammond, M. Elizabeth; Venkatesan, Varagur; Byhardt, Roger W.; Asbell, Sucha O.; Shipley, William U.; Sandler, Howard M.
In: Clinical Cancer Research, Vol. 15, No. 17, 01.09.2009, p. 5478-5484.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The importance of protein kinase A in prostate cancer
T2 - Relationship to patient outcome in Radiation Therapy Oncology Group trial 92-02
AU - Pollack, Alan
AU - Bae, Kyounghwa
AU - Khor, Li Yan
AU - Al-Saleem, Tahseen
AU - Hammond, M. Elizabeth
AU - Venkatesan, Varagur
AU - Byhardt, Roger W.
AU - Asbell, Sucha O.
AU - Shipley, William U.
AU - Sandler, Howard M.
PY - 2009/9/1
Y1 - 2009/9/1
N2 - Purpose: Wepreviously reported that protein kinase A type I (PKA RIα) overexpression was predictive of outcome in prostate cancer patients treated with radiotherapy (RT) ± short-term androgen deprivation (STAD) on Radiation Therapy Oncology Group (RTOG) protocol 86-10. Here, we attempt to verify our prior findings and test the hypothesis that the relationship of the length of AD to patient outcome is affected by PKA RIα overexpression. Experimental Design: There were 313 cases in the RTOG 92-02 study cohort with available tissue and suitable staining by immunohistochemistry. Median follow-up was 10.1 years. The intensity of PKA RIα staining intensity was quantified manually and by image analysis. Multivariate analyseswere done for overallmortality using Cox proportional hazards models and for local failure, biochemical failure, distant metastasis, and cause-specific mortality using Fine and Gray's regression models. Results: The expression levels of PKA RIα, determined bymanual and image analysis, were strongly correlated (P < 0.0001). In the multivariate analyses, manual-quantified and image analysis-quantified PKA RIα staining intensities were independent predictors of distant metastasis (P < 0.01), local failure (P < 0.05), and biochemical failure (P ≤ 0.01). Furthermore, the benefit of long-term AD over STAD was much less when PKA RIα expression was high. Conclusions: PKA RIα overexpression has been shown in two RTOG trials to be associated with an increased risk of failure after AD+ RT. In this series of contemporary high-risk patients, PKA RIα overexpression was associated with diminished response to LTAD + RT relative to STAD + RT, suggesting that such patients would be ideal for a PKA RIα knockdown strategy.
AB - Purpose: Wepreviously reported that protein kinase A type I (PKA RIα) overexpression was predictive of outcome in prostate cancer patients treated with radiotherapy (RT) ± short-term androgen deprivation (STAD) on Radiation Therapy Oncology Group (RTOG) protocol 86-10. Here, we attempt to verify our prior findings and test the hypothesis that the relationship of the length of AD to patient outcome is affected by PKA RIα overexpression. Experimental Design: There were 313 cases in the RTOG 92-02 study cohort with available tissue and suitable staining by immunohistochemistry. Median follow-up was 10.1 years. The intensity of PKA RIα staining intensity was quantified manually and by image analysis. Multivariate analyseswere done for overallmortality using Cox proportional hazards models and for local failure, biochemical failure, distant metastasis, and cause-specific mortality using Fine and Gray's regression models. Results: The expression levels of PKA RIα, determined bymanual and image analysis, were strongly correlated (P < 0.0001). In the multivariate analyses, manual-quantified and image analysis-quantified PKA RIα staining intensities were independent predictors of distant metastasis (P < 0.01), local failure (P < 0.05), and biochemical failure (P ≤ 0.01). Furthermore, the benefit of long-term AD over STAD was much less when PKA RIα expression was high. Conclusions: PKA RIα overexpression has been shown in two RTOG trials to be associated with an increased risk of failure after AD+ RT. In this series of contemporary high-risk patients, PKA RIα overexpression was associated with diminished response to LTAD + RT relative to STAD + RT, suggesting that such patients would be ideal for a PKA RIα knockdown strategy.
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U2 - 10.1158/1078-0432.CCR-08-2704
DO - 10.1158/1078-0432.CCR-08-2704
M3 - Article
VL - 15
SP - 5478
EP - 5484
JO - Clinical Cancer Research
JF - Clinical Cancer Research
SN - 1078-0432
IS - 17
ER -