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2012 EDUCATIONAL BOOK - American Society of Clinical Oncology

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ANTIANGIOGENICS AND PARP INHIBITORS IN OVARIAN CANCER<br />

rubicin (PLD) in patients with BRCA1/2-mutated ovarian<br />

cancer did not show a significant PFS advantage for either<br />

olaparib dosing schedule (200 mg twice daily, 6.5 months;<br />

400 mg twice daily, 8.8 months) compared with PLD (7.1<br />

months; HR � 0.88; p � 0.66). 19 Nonetheless, with comparable<br />

efficacy, replacing PLD with a tablet is an attractive<br />

option.<br />

The concept <strong>of</strong> BRCAness as described earlier herein led<br />

to the investigation <strong>of</strong> whether PARP inhibitors were clinically<br />

active in patients with sporadic serous ovarian cancers.<br />

A phase II trial <strong>of</strong> olaparib 400 mg twice daily in patients<br />

with (n � 17) and without (n � 47) BRCA1/2 mutations<br />

reported a response rate <strong>of</strong> 41% and 24%, respectively. The<br />

better responses were again seen mostly in patients with<br />

platinum-sensitive disease. 20<br />

A phase II randomized placebo-controlled trial <strong>of</strong> olaparib<br />

monotherapy as maintenance treatment for patients with<br />

relapsed platinum-sensitive serous ovarian cancer was reported<br />

at ASCO in 2011. 21 PFS by Response Evaluation<br />

Criteria in Solid Tumors (RECIST) criteria was significantly<br />

longer in the olaparib group (n � 136) compared with the<br />

placebo group (n � 129;8.4 vs. 4.8 months; HR � 0.35; p �<br />

0.00001; Fig. 1). The PFS did not translate into an OS<br />

benefit, which has led AstraZeneca (Wilmington, DE) to stop<br />

pursuing this indication.<br />

Besides those evaluating olaparib, clinical trials are underway<br />

with several other PARP inhibitors as monotherapy<br />

in ovarian cancer and include MK4827 (Merck; Whitehouse<br />

Station, NY), CEP-9722 (Cephalon, Frazer, PA), ABT-888<br />

(Abbott Laboratories, Abbott Park, IL) and rucaparib (previously<br />

PF-01367338 or AG014699). Preliminary phase I<br />

results for MK4827 have shown efficacy comparable with<br />

olaparib 22 and certainly warrant further investigation in<br />

this setting. BMN-673 (BioMarin Pharmaceutical Inc., Novato,<br />

CA) is the most selective and potent PARP inhibitor<br />

reported to date, and phase I data are awaited with interest.<br />

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

Employment or<br />

Leadership<br />

Positions<br />

Consultant or<br />

Advisory Role<br />

Author<br />

Rene Roux*<br />

Martin Zweifel*<br />

Gordon J. S. Rustin AstraZeneca;<br />

Roche<br />

*No relevant relationships to disclose.<br />

1. Campos SM, Ghosh S. A current review <strong>of</strong> targeted therapeutics for<br />

ovarian cancer. J Clin Oncol. 2010;28:149362.<br />

2. Mukherjee L, Rustin G. Antivascular therapy in gynaecological cancers.<br />

In Kehoe S, Edmondson RJ, Gore M, et al (eds): Gynaecological Cancers:<br />

Biology and Therapeutics. London: RCOG Press, 2011;121-137.<br />

3. Burger RA, Sill MW, Monk BJ, et al. Phase II trial <strong>of</strong> bevacizumab in<br />

persistent or recurrent epithelial ovarian cancer or primary peritoneal<br />

cancer: a Gynecologic <strong>Oncology</strong> Group Study. J Clin Oncol. 2007;25:5165-<br />

5171.<br />

4. Cannistra SA, Matulonis UA, Penson RT, et al. Phase II study <strong>of</strong><br />

bevacizumab in patients with platinum-resistant ovarian cancer or peritoneal<br />

serous cancer. J Clin Oncol. 2007;25:5180-5186.<br />

5. Perren TJ, Swart AM, Pfisterer J, et al. A phase 3 trial <strong>of</strong> bevacizumab<br />

in ovarian cancer. N Engl J Med. 2011;365:2484-2496.<br />

6. Burger RA, Brady MF, Bookman MA, et al. Incorporation <strong>of</strong> bevacizumab<br />

in the primary treatment <strong>of</strong> ovarian cancer. N Engl J Med. 2011;365:<br />

2473-2483.<br />

Conclusion<br />

Bevacizumab 7.5 mg/kg 3-weekly, should be considered<br />

for patients who are at high risk <strong>of</strong> having a short PFS<br />

because the bevacizumab might delay time to symptomatic<br />

relapse, and it is this group <strong>of</strong> patients who seem to achieve<br />

a substantial survival gain. For patients with optimally<br />

debulked disease, the greatest benefit from bevacizumab is<br />

more likely to be part <strong>of</strong> relapse therapy. The greatest<br />

benefit from PARP inhibitors will be in patients with BRCA<br />

mutations, but they are also likely to have a role in patients<br />

with high-grade serous ovarian cancers. Myelosuppression<br />

is likely to prevent PARP inhibitor administration in combination<br />

with chemotherapy. Because they have shown<br />

single-agent activity and can delay progression, they have<br />

the potential to be used as another line <strong>of</strong> relapse therapy or<br />

as maintenance therapy after chemotherapy for relapse.<br />

Stock<br />

Ownership Honoraria<br />

REFERENCES<br />

Fig 1. Progression-free survival <strong>of</strong> patients in a phase II randomized<br />

placebo-controlled trial <strong>of</strong> olaparib monotherapy as maintenance<br />

treatment for patients with relapsed platinum-sensitive serous<br />

ovarian cancer. Reprinted with permission. © <strong>American</strong> <strong>Society</strong> <strong>of</strong><br />

<strong>Clinical</strong> <strong>Oncology</strong>. All rights reserved. 21<br />

Boehringer<br />

Ingelheim<br />

Research<br />

Funding<br />

Expert<br />

Testimony<br />

Other<br />

Remuneration<br />

7. Katsumata N, Yasuda M, Takahashi F, et al. Dose-dense paclitaxel once<br />

a week in combination with carboplatin every 3 weeks for advanced ovarian<br />

cancer: a phase 3, open-label, randomised controlled trial. Lancet. 2009;374:<br />

1331-1338.<br />

8. Gonzalez-Martin A, Gladieff L, Stroyakovskiy D, et al. Front-line bevacizumab<br />

(BEV) combined with weekly paclitaxel (wPAC) and carboplatin (C)<br />

for ovarian cancer (OC): safety results from the concurrent chemotherapy<br />

(CT) phase <strong>of</strong> the OCTAVIa study. Presented at: European Multidisciplinary<br />

Cancer Congress; 2011; Stockholm, Sweden (abstr 8002).<br />

9. Aghajanian C, Finkler NJ, Rutherford T, et al. OCEANS: A randomized,<br />

double-blinded, placebo-controlled phase III trial <strong>of</strong> chemotherapy with or<br />

without bevacizumab (BEV) in patients with platinum-sensitive recurrent<br />

epithelial ovarian (EOC), primary peritoneal (PPC), or fallopian tube cancer<br />

(FTC). J Clin Oncol. 2011;29:45S (suppl; abstr LBA5007).<br />

10. Coleman RL. Making <strong>of</strong> a phase III study in recurrent ovarian cancer:<br />

the odyssey <strong>of</strong> GOG 213. Clin Ovarian Cancer. 2008;1:78-80.<br />

11. Chambon P, Weill JD, Mandel P. Nicotinamide mononucleotide activa-<br />

343

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