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2012 EDUCATIONAL BOOK - American Society of Clinical Oncology

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THERAPEUTIC OPTIONS FOR PROSTATE CANCER<br />

therapy at each juncture, but today we are <strong>of</strong>ten humbled by<br />

how poorly we predict patient outcomes.<br />

What about combination therapy? Is the metastatic CRPC<br />

state to be restricted to a sequencing therapeutic paradigm?<br />

Though combination therapy has a certain attraction in<br />

CRPC, other than the agents designed to inhibit skeletalrelated<br />

events (zoledronic acid and denosumab), there are<br />

minimal data on combination therapies using the survivalprolonging<br />

agents. Until new data exist, the current sequencing<br />

paradigm may be optimal for patients in nonclinical trial<br />

settings.<br />

It is clear from phase I/II studies that patients with<br />

nondocetaxel-pretreated metastatic CRPC are quite<br />

responsive to the newer hormonal agents, such as abiraterone<br />

and MDV-3100. 9,10 This emphasizes that our division<br />

<strong>of</strong> metastatic CRPC into pre- and postdocetaxel spaces<br />

Author’s Disclosures <strong>of</strong> Potential Conflicts <strong>of</strong> Interest<br />

Author<br />

Employment or<br />

Leadership<br />

Positions<br />

Consultant or<br />

Advisory Role<br />

Oliver Sartor Algeta; Amgen;<br />

Bayer; Bellicum;<br />

Bristol-Myers<br />

Squibb; Celgene;<br />

Dendreon;<br />

Exelixis;<br />

GlaxoSmithKline;<br />

Johnson &<br />

Johnson;<br />

Medivation;<br />

Oncogenex;<br />

Pfizer; San<strong>of</strong>i;<br />

Takeda<br />

Authors’ Disclosures <strong>of</strong> Potential Conflicts <strong>of</strong> Interest<br />

1. Tannock IF, de Wit R, Berry WR, et al. Docetaxel plus prednisone or<br />

mitoxantrone plus prednisone for advanced prostate cancer. N Engl J Med.<br />

2004;351:1502-1512.<br />

2. Petrylak DP, Tangen CM, Hussain MH, et al. Docetaxel and estramustine<br />

compared with mitoxantrone and prednisone for advanced refractory<br />

prostate cancer. N Engl J Med. 2004;351:1513-1520.<br />

3. Kant<strong>of</strong>f PW, Higano CS, Shore ND, et al. Sipuleucel-T immunotherapy<br />

for castration-resistant prostate cancer. N Engl J Med. 2010;363:411-422.<br />

4. de Bono JS, Oudard S, Ozguroglu M, et al. Prednisone plus cabazitaxel<br />

or mitoxantrone for metastatic castration-resistant prostate cancer progressing<br />

after docetaxel treatment: A randomised open-label trial. Lancet. 2010;<br />

376:1147-1154.<br />

5. de Bono JS, Logothetis CJ, Molina A, et al. Abiraterone and increased<br />

survival in metastatic prostate cancer. N Engl J Med. 2011;364:1995-2005.<br />

6. Parker C, Heinrich D, O’Sullivan JM, et al. Overall survival benefit <strong>of</strong><br />

radium-223 chloride (Alpharadin) in the treatment <strong>of</strong> patients with symptom-<br />

is one based on regulatory and not biologic concerns. Trials<br />

are ongoing to further assess both abiraterone and MDV-<br />

3100 in the predoctaxel space and perhaps there will be<br />

results from one <strong>of</strong> these trials by the <strong>2012</strong> ASCO Annual<br />

Meeting.<br />

All <strong>of</strong> the FDA-approved agents to date have been approved<br />

in a metastatic CRPC setting, yet many patients<br />

present to a physician with a rising prostate-specific antigen,<br />

a castrate level <strong>of</strong> testosterone, and no radiographic<br />

evidence <strong>of</strong> metastatic disease. What do you do in this case?<br />

The answer is not yet clear and there are no FDA-approved<br />

treatments. In my practice, a variety <strong>of</strong> secondary hormonal<br />

agents, such as nilutamide, bicalutamide, low-dose diethylstilbestrol,<br />

and ketoconazole are used despite no phase III<br />

evidence to support their use. Good clinical trials are always<br />

an important consideration as well.<br />

Stock<br />

Ownership Honoraria<br />

REFERENCES<br />

Research<br />

Funding<br />

San<strong>of</strong>i Algeta;<br />

AstraZeneca;<br />

Cougar<br />

Biotechnology;<br />

Exelixis;<br />

GlaxoSmithKline;<br />

Johnson &<br />

Johnson; San<strong>of</strong>i<br />

Expert<br />

Testimony<br />

Other<br />

Remuneration<br />

atic bone metastases in castration-resistant prostate cancer (CRPC): a phase<br />

III randomized trial (ALSYMPCA). Eur J Cancer. 2011;47 (suppl 2).<br />

7. Scher HI, Fizazi K, Saad F, et al. Effect <strong>of</strong> MDV3100, an androgen<br />

receptor signaling inhibitor (ARSI), on overall survival in patients with<br />

prostate cancer postdocetaxel: Results from the phase III AFFIRM study.<br />

J Clin Oncol. <strong>2012</strong>;30 (suppl 5; abstr LBA1).<br />

8. Perlroth DJ, Thompson SF, Luna Y, et al. Time to ADT and chemotherapy<br />

initiation for treatment <strong>of</strong> metastatic prostate cancer (mPC). J Clin<br />

Oncol. <strong>2012</strong>;30 (suppl 5; abstr 41).<br />

9. Attard G, Reid AH, Yap TA, et al. Phase I clinical trial <strong>of</strong> a selective<br />

inhibitor <strong>of</strong> CYP17, abiraterone acetate, confirms that castration-resistant<br />

prostate cancer commonly remains hormone driven. J Clin Oncol. 2008;26:<br />

4563-4571.<br />

10. Scher HI, Beer TM, Higano CS, et al. Antitumour activity <strong>of</strong> MDV3100<br />

in castration-resistant prostate cancer: A phase 1-2 study. Lancet. 2010;375:<br />

1437-1446.<br />

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