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  ["property_scientific_abstract"]=>
  string(1104) "Background

Many patients who were prescribed alpha blockers or 5-ARI because of lower urinary tracts symptoms (LUTS) continue to take those drugs when they are diagnosed with prostate cancer or castration resistant prostate cancer (CRPC) even though little is known about the clinical impact of alpha blockers or 5-ARI in the CRPC setting. Therefore it is of utmost importance to clarify the combination of those drugs with abiraterone.

Objective

To assess the association between 5-ARI intake and PFS, OS and need for palliative TURP, ureter stent placement and change in urinary symptoms or incidence of urinary tract infections

Study Design

Post-hoc analysis of two randomized controlled phase 3 studies.

Participants

Patients treated with abiraterone in the chemotherapy-nave and post-chemotherapy CRPC setting.

Main Outcome Measures

 Radiographic progression free and overall survival as well as on urinary function

Statistical Analysis

Uni- and multivariable Cox regression analysis, Kaplan?Meier plots and log-rank tests"
  ["project_brief_bg"]=>
  string(3158) "Prostate cancer (PC) is one of the most common cancers in men leading to an estimated 1.1 million new diagnoses every year and is the second leading cause of male cancer mortality in western countries with more than 200,000 PC deaths every year [1]. When PC is limited to the prostate, cure can be achieved by either surgery or radiotherapy. However, in patients with metastases, cure is usually no longer possible. Patients with advanced PC are typically treated with androgen deprivation therapy (ADT) because PC growth is dependent on androgens (i.e. testosterone), which bind to the androgen receptor (AR) of the PC cell. However, PC cells eventually adapt to the low testosterone levels leading to disease progression despite androgen deprivation. This state of the disease is termed castration-resistant PC (CRPC). Nevertheless, recurrent tumors frequently express androgen receptor (AR) [2] or downstream target genes, such as prostate-specific antigen (PSA) [3], and many patients with CRPC respond to second line hormonal treatment options including abiraterone (Abi) or enzalutamide (Enza) [5, 6]. These findings suggest that CRPC cells are neither hormone refractory nor androgen independent and maintain a clinically relevant reliance on the AR signaling axis and 5?-reductase inhibitors (5-ARI) inhibitors may play a role in cancer progression because of 2 modes of action.

First, 5-ARI inhibit the conversion of testosterone to the more potent dihydrotestosterone and may influence disease progression. Especially because a proposed mechanism of resistance includes AR activation by androgens converted from adrenal androgens or synthesized within the cancer cell itself, 5-ARI may have an effect on disease progression [13].

Second, by controlling conversion to subsequent metabolites of Abi and Enza it seems plausible that 5-ARI inhibitors improve the response to second line hormonal treatment options. Abi is converted into several metabolites, of which some have anti- and others show pro-tumor activity. As a first step Abi is converted to D4A, which blocks multiple enzymes required for 5?-dihydrotestosterone (DHT) synthesis, antagonizes the androgen receptor (AR), and has more potent anti-tumour activity than Abi itself[7]. Subsequently D4A is irreversibly converted into 6 different metabolites summarized as 5?- and 5?- metabolites which have either pro- or antitumor activity[8]. In a clinical trial the addition of a 5?-reductase inhibitor led to an accumulation of the anti-tumor metabolite D4A and a depletion of the pro-tumor 5?-abiraterone metabolites [8, 9]. Similarly, the combination of a 5?-reductase inhibitor and Enza compared to Enza alone led to a more pronounced inhibition of cell proliferation compared to Enza alone [10].

Many patients who were prescribed 5-ARI because of lower urinary tracts symptoms (LUTS) continue to take alpha blockers or 5-ARIs when they are diagnosed with PC or CRPC even though little is known about the clinical impact of those drugs in the CRPC disease settings. Therefore it is of utmost importance to clarify the combination of alpha blockers or 5-ARI with Abi."
  ["project_specific_aims"]=>
  string(479) "Specific Aim: To evaluate the impact of alpha blockers and 5?-reductase inhibitors (5-ARI) on radiographic progression free (rPFCS) and overall survival (OS) as well as on urinary function in patients treated with abiraterone because of castration resistant prostate cancer

Null hypothesis: No difference in rPFS, OS and urinary function between patients with or without 5-ARI

Hypothesis: Patients with treated with 5-ARI show superior rPFS, OS and urinary function"
  ["project_study_design"]=>
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  ["project_research_methods"]=>
  string(135) "Inclusion criteria: Patients treated with abiraterone within the COU-AA-301/302 trials

Exclusion criteria: Radical prostatectomy"
  ["project_main_outcome_measure"]=>
  string(303) "?	Progression free survival (PFS) and overall survival (OS)

?	Time to palliative TURP because of urinary tract obstruction

?	Time to double-J stent placement because of ureteral obstruction

?	Change of urinary symptom scores according to FACT Advanced Prostate Symptom Index (FAPSI)"
  ["project_main_predictor_indep"]=>
  string(689) "Age

BMI

ECOG performance status

Patient reported outcomes

Time since diagnosis

PSA at study inclusion

Presence of visceral metastases

Lactate dehydrogenase

Opioid analgesic use

Average baseline pain score (based on Brief Pain Inventory question 3

Baseline fatigue severity (based on Brief Fatigue Inventory question 3

Albumin

Hemoglobin

Alkaline phosphatase

Number of bone metastases at screening

Type of disease progression at study entry

Number of prior chemotherapy regimens

Duration of prior hormonal use

Treatment of primary tumor

Subsequent treatment"
  ["project_other_variables_interest"]=>
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  ["project_stat_analysis_plan"]=>
  string(456) "We perform univariable Cox regression analysis to assess the association between 5-ARI intake and PFS, OS and need for palliative TURP, ureter stent placement and change in urinary symptoms. Multivariable Cox regression analyses including potential confounders will be performed to control for potential bias. Kaplan?Meier plots and log-rank tests will used to compare the outcomes of interest between patients with or without alpha blocker or 5-ARI usage."
  ["project_timeline"]=>
  string(124) "Access to data 01/2018

Statistical anaylsis 01-06/2018

Manuscript writing 07-09/2018

Submission 10/2018"
  ["project_dissemination_plan"]=>
  string(73) "Journal of clinical oncology

Jama oncology

European Urology"
  ["project_bibliography"]=>
  string(2122) "
1. Bray F, Lortet-Tieulent J, Ferlay J et al. Prostate cancer incidence and mortality trends in 37 European countries: an overview. Eur J Cancer 2010; 46: 3040-3052.

2. Gao S, Ye H, Gerrin S et al. ErbB2 Signaling Increases Androgen Receptor Expression in Abiraterone-Resistant Prostate Cancer. Clinical Cancer Research 2016; 22: 3672-3682.

3. Holzbeierlein J, Lal P, LaTulippe E et al. Gene expression analysis of human prostate carcinoma during hormonal therapy identifies androgen-responsive genes and mechanisms of therapy resistance. Am J Pathol 2004; 164: 217-227.

4. de Bono JS, Oudard S, Ozguroglu M et al. Prednisone plus cabazitaxel or mitoxantrone for metastatic castration-resistant prostate cancer progressing after docetaxel treatment: a randomised open-label trial. Lancet 2010; 376: 1147-1154.

5. de Bono JS, Logothetis CJ, Molina A et al. Abiraterone and increased survival in metastatic prostate cancer. N Engl J Med 2011; 364: 1995-2005.

6. Scher HI, Fizazi K, Saad F et al. Increased survival with enzalutamide in prostate cancer after chemotherapy. N Engl J Med 2012; 367: 1187-1197.

7. Li Z, Bishop AC, Alyamani M et al. Conversion of abiraterone to D4A drives anti-tumour activity in prostate cancer. Nature 2015; 523: 347-351.

8. Li Z, Alyamani M, Li J et al. Redirecting abiraterone metabolism to fine-tune prostate cancer anti-androgen therapy. Nature 2016; 533: 547-551.

9. McKay RR, Werner L, Mostaghel EA et al. A Phase II Trial of Abiraterone Combined with Dutasteride for Men with Metastatic Castration-Resistant Prostate Cancer. Clinical Cancer Research 2017; 23: 935-945.

10. Hamid AR, Verhaegh GW, Smit FP et al. Dutasteride and enzalutamide synergistically suppress prostate tumor cell proliferation. J Urol 2015; 193: 1023-1029.

11. Thompson IM, Goodman PJ, Tangen CM et al. The influence of finasteride on the development of prostate cancer. N Engl J Med 2003; 349: 215-224.

12. Andriole GL, Bostwick DG, Brawley OW et al. Effect of dutasteride on the risk of prostate cancer. N Engl J Med 2010; 362: 1192-1202.
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    string(3) "pdf"
    ["icon"]=>
    string(62) "https://yoda.yale.edu/wp/wp-includes/images/media/document.png"
  }
  ["project_highlight_button"]=>
  string(0) ""
  ["request_data_partner"]=>
  string(15) "johnson-johnson"
  ["search_order"]=>
  string(5) "-9040"
  ["request_overridden_res"]=>
  string(1) "2"
}
data partner
array(1) {
  [0]=>
  string(15) "johnson-johnson"
}


pi country
array(1) {
  [0]=>
  string(11) "Switzerland"
}


pi affil
array(1) {
  [0]=>
  string(8) "Academia"
}


products
array(1) {
  [0]=>
  string(6) "zytiga"
}


num of trials
array(1) {
  [0]=>
  string(1) "2"
}


res
array(1) {
  [0]=>
  string(1) "2"
}