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Predictors of castration-resistant prostate cancer after dose-escalated external beam radiotherapy.

ABSTRACT: Castration-resistant prostate cancer (CRPC) is a near uniformly fatal form of prostate cancer; however, information on time to development and predictors for progression to CRPC is limited. We report a detailed longitudinal study for development of CRPC in men initially treated with external beam radiotherapy (EBRT).During 1991-2008, 2,478 patients with clinically localized prostate cancer were treated with dose-escalated EBRT at a single institution. The primary objective was to determine predictors of CRPC among men who failed definitive EBRT and progressed to salvage androgen-deprivation therapy (ADT). CRPC was defined as castrate levels of testosterone (<50?ng/dl) with progressive biochemical or radiographic disease.For the entire cohort (n?=?2,478), the 10-year cumulative incidence rate for developing CRPC was 9.9%. For those that progressed to salvage ADT (n?=?362), the 7-year cumulative incidence rates for developing CRPC from time of salvage ADT was 33.7%. Amongst this cohort, multivariable analysis demonstrated that PSA doubling-time (continuous; hazard ratio [HR], 0.98 [0.97-0.99], P?

SUBMITTER: Spratt DE

PROVIDER: S-EPMC5522730 | biostudies-literature | 2015 Feb

REPOSITORIES: biostudies-literature

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Predictors of castration-resistant prostate cancer after dose-escalated external beam radiotherapy.

Spratt Daniel E DE Zumsteg Zachary S ZS Pei Xin X Romesser Paul B PB Yamada Josh J Kollmeier Marisa A MA Woo Kaitlin K Zhang Zhigang Z Zelefsky Michael J MJ

The Prostate 20141018 2

<h4>Background</h4>Castration-resistant prostate cancer (CRPC) is a near uniformly fatal form of prostate cancer; however, information on time to development and predictors for progression to CRPC is limited. We report a detailed longitudinal study for development of CRPC in men initially treated with external beam radiotherapy (EBRT).<h4>Methods</h4>During 1991-2008, 2,478 patients with clinically localized prostate cancer were treated with dose-escalated EBRT at a single institution. The prima ...[more]

PMID: 25327412

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Project description:The management of biochemical failure (BF) following external beam radiotherapy (EBRT) for prostate cancer is controversial, due to both the heterogeneous disease course following a BF and a lack of clinical trials in this setting.We sought to characterize the natural history and predictors of outcome for patients experiencing BF in a large cohort of men with localized prostate cancer undergoing definitive dose-escalated EBRT.This retrospective analysis included 2694 patients with localized prostate cancer treated with EBRT at a large academic center. Of these, 609 experienced BF, defined as prostate-specific antigen (PSA) nadir + 2 ng/ml. The median follow-up was 83 mo for all patients and 122 mo for BF patients.All patients received EBRT at doses of 75.6-86.4 Gy.The primary objective of this study was to determine predictors of distant progression at the time of BF. Cox proportional hazards models were used in univariate and multivariate analyses of distant metastases (DM), and a competing risks method was used to analyze prostate cancer-specific mortality (PCSM).From the date of BF, the median times to DM and PCSM mortality were 5.4 yr and 10.5 yr, respectively. Shorter posttreatment PSA doubling time, a higher initial clinical tumor stage, a higher pretreatment Gleason score, and a shorter interval from the end of radiotherapy to BF were independent predictors for clinical progression following BF. Patients with two of these risk factors had a significantly higher incidence of DM and PCSM following BF than those with zero or one risk factor. The main limitations of this study are its retrospective nature and heterogeneous salvage interventions.Clinical and pathologic factors can help identify patients at high risk of clinical progression following BF.In this report, we look at predictors of outcome for patients with prostate cancer recurrence, as determined by prostate-specific antigen (PSA) levels, following radiation treatment. We found that the approximate median times to distant metastasis and death from prostate cancer for patients in this situation were 5 yr and 10 yr, respectively. Furthermore, we found that patients with a rapid increase in PSA levels following treatment, a short time to PSA recurrence, invasion of extraprostatic organs, or a high Gleason score had worse outcomes.

Project description:We provide a comprehensive analysis of anatomical patterns of recurrence following external beam radiotherapy in patients with localized prostate cancer.This retrospective analysis included 2,694 patients with localized prostate cancer who received definitive, dose escalated external beam radiotherapy from 1991 to 2008. First recurrence sites were defined as initial sites of clinically detected recurrence and any subsequent clinically detected recurrence within 3 months. Anatomical recurrence patterns were classified as local (prostate/seminal vesicles only), lymphotropic (lymph nodes only) and osteotropic (bones only) in patients with disease confined only to these respective sites for at least 2 years from the initial clinically detected recurrence.Prostate was the most common first recurrence site in the low, intermediate and high risk groups with an 8-year cumulative incidence of 3.5%, 9.8% and 14.6%, respectively. The 8-year risk of isolated pelvic lymph node relapse as the first recurrence site was 0%, 1.0% and 3.3%, respectively. In the 474 patients with clinically detected recurrence the most common first recurrence site was local in 55.3%, bone in 33.5%, pelvic lymph nodes in 21.3% and abdominal lymph nodes in 9.1%. Patients showed unique relapse distributions, including a pattern that was local in 41.6%, lymphotropic in 9.7%, osteotropic in 20.3% and multiorgan/visceral in 28.5%. Anatomical recurrence pattern was the strongest predictor of prostate cancer specific mortality on multivariate analysis of patients with clinically detected recurrence.The most common first recurrence site after dose escalated external beam radiotherapy for prostate cancer is in the prostate and seminal vesicles in all risk groups. In contrast, patients treated without elective pelvic lymph node irradiation are at relatively low risk for isolated pelvic lymph node relapse. Recurrence patterns revealed a tropism for specific anatomical distributions with divergent prognoses, suggesting underlying biological differences among tumors.

Dataset Information

Predictors of castration-resistant prostate cancer after dose-escalated external beam radiotherapy.

Publications

Predictors of castration-resistant prostate cancer after dose-escalated external beam radiotherapy.

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