TY - JOUR
T1 - Null association between androgen-deprivation therapy and nonprostate cancer mortality among older men with nonmetastatic prostate cancer
AU - Wallis, Christopher J.D.
AU - Satkunasivam, Raj
AU - Herschorn, Sender
AU - Law, Calvin
AU - Seth, Arun
AU - Kodama, Ronald T.
AU - Kulkarni, Girish S.
AU - Nam, Robert K.
PY - 2018/5/1
Y1 - 2018/5/1
N2 - Background: Androgen-deprivation therapy (ADT) has been associated with cardiovascular risk factors and the development of cardiovascular disease in men with metastatic prostate cancer. We sought to examine the effect of ADT on nonprostate cancer mortality among patients with nonmetastatic prostate cancer. Methods: We performed a population-based, retrospective cohort study of men aged 66 years and older treated with surgery or radiotherapy for nonmetastatic prostate cancer in Ontario, Canada from 2002 to 2009 using administrative datasets (including the Ontario Cancer Registry, Ontario Drug Benefit, and Ontario Health Insurance Plan). Analysis was performed between September 2016 and April 2017. ADT exposure was operationalized as a time-varying binary and cumulative dose exposure. Primary and secondary outcomes were nonprostate cancer mortality and cardiovascular mortality, respectively. The Fine and Gray subdistribution method with generalized estimating equations was used to calculate subdistribution hazard ratios (sdHR), while accounting for competing risks. Results: We examined 20,651 men treated for nonmetastatic prostate cancer. Median follow-up was 7.4 years and median ADT exposure was 6.4 months. ADT was not significantly associated with nonprostate cancer mortality (sdHR = 0.75, 95% CI: 0.37–1.50) or cardiovascular mortality (sdHR = 1.16, 95% CI: 0.37–3.63) when operationalized as a binary time-varying exposure. Similar results were obtained when we examined ADT cumulative dose exposure. Conclusions: ADT is not associated with nonprostate cancer mortality or cardiovascular mortality in a large, population-based cohort of older men with localized prostate cancer treated by surgery or radiation therapy.
AB - Background: Androgen-deprivation therapy (ADT) has been associated with cardiovascular risk factors and the development of cardiovascular disease in men with metastatic prostate cancer. We sought to examine the effect of ADT on nonprostate cancer mortality among patients with nonmetastatic prostate cancer. Methods: We performed a population-based, retrospective cohort study of men aged 66 years and older treated with surgery or radiotherapy for nonmetastatic prostate cancer in Ontario, Canada from 2002 to 2009 using administrative datasets (including the Ontario Cancer Registry, Ontario Drug Benefit, and Ontario Health Insurance Plan). Analysis was performed between September 2016 and April 2017. ADT exposure was operationalized as a time-varying binary and cumulative dose exposure. Primary and secondary outcomes were nonprostate cancer mortality and cardiovascular mortality, respectively. The Fine and Gray subdistribution method with generalized estimating equations was used to calculate subdistribution hazard ratios (sdHR), while accounting for competing risks. Results: We examined 20,651 men treated for nonmetastatic prostate cancer. Median follow-up was 7.4 years and median ADT exposure was 6.4 months. ADT was not significantly associated with nonprostate cancer mortality (sdHR = 0.75, 95% CI: 0.37–1.50) or cardiovascular mortality (sdHR = 1.16, 95% CI: 0.37–3.63) when operationalized as a binary time-varying exposure. Similar results were obtained when we examined ADT cumulative dose exposure. Conclusions: ADT is not associated with nonprostate cancer mortality or cardiovascular mortality in a large, population-based cohort of older men with localized prostate cancer treated by surgery or radiation therapy.
KW - Androgen antagonists
KW - Brachytherapy
KW - Cardiovascular diseases
KW - Comparative effectiveness research
KW - Prostatectomy
KW - Radiotherapy
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U2 - 10.1016/j.urolonc.2018.02.001
DO - 10.1016/j.urolonc.2018.02.001
M3 - Article
C2 - 29503141
AN - SCOPUS:85042565896
VL - 36
SP - 241.e1-241.e6
JO - Urologic Oncology: Seminars and Original Investigations
JF - Urologic Oncology: Seminars and Original Investigations
SN - 1078-1439
IS - 5
ER -