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2012 EDUCATIONAL BOOK - American Society of Clinical Oncology

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THERAPIES FOR PATIENTS WITH METASTATIC MELANOMA<br />

ipilimumab may get the benefit <strong>of</strong> a durable response (up to<br />

25%) without compromising the benefit <strong>of</strong> subsequent vemurafenib<br />

for those patients who exhibit disease progression,<br />

whereas those started on vemurafenib may not be able to<br />

benefit from subsequent ipilimumab at time <strong>of</strong> progression.<br />

It is also possible that the high response rate and prolonged<br />

progression free survival associated with vemurafenib therapy<br />

relative to ipilimumab may overwhelm any benefit that<br />

might be achieved with initial ipilimumab therapy. Further,<br />

it is possible that subsets <strong>of</strong> patients, defined by tumor<br />

and/or clinical characteristics (for example, PTEN loss, immune<br />

infiltration, high serum LDH), might do better with<br />

one initial therapy or sequence than with the other. A<br />

randomized phase III trial <strong>of</strong> ipilimumab (followed by vemurafenib)<br />

versus vemurafenib (followed by ipilimumab) is<br />

being planned within the Cooperative Group mechanism in<br />

an effort to obtain real data to address these important<br />

therapeutic questions and guide future treatment choices for<br />

this patient population. In addition, this population repre-<br />

Authors’ 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 />

Keith T. Flaherty Genentech;<br />

GlaxoSmithKline;<br />

Metamark<br />

Genetics<br />

Jeff A. Sosman GlaxoSmithKline;<br />

Roche<br />

Michael B. Atkins Bristol-Myers<br />

Squibb; Celgene;<br />

Curetech;<br />

Genentech;<br />

Merck; Novartis;<br />

Prometheus<br />

1. Siegel R, Ward E, Brawley O, et al. Cancer Statistics, 2011: the impact<br />

<strong>of</strong> eliminating socioeconomic and racial disparities on premature cancer<br />

deaths. CA Cancer J Clin. 2011;61:212-236.<br />

2. Atkins MB, Lotze MT, Dutcher JP, et al. High-dose recombinant interleukin<br />

2 therapy for patients with metastatic melanoma: analysis <strong>of</strong> 270<br />

patients treated between 1985 and 1993. J Clin Oncol. 1999;17:2105-2116.<br />

3. Davies H, Bignell GR, Cox C, et al. Mutations <strong>of</strong> the BRAF gene in<br />

human cancer. Nature. 2002;417:949-954.<br />

4. Tsai J, Lee JT, Wang W, et al. Discovery <strong>of</strong> a selective inhibitor <strong>of</strong><br />

oncogenic B-Raf kinase with potent antimelanoma activity. Proc Natl Acad<br />

SciUSA.2008;105:3041-3046.<br />

5. Neal SE, Eccleston JF, Webb MR. Hydrolysis <strong>of</strong> GTP by p21NRAS, the<br />

NRAS protooncogene product, is accompanied by a conformational change in<br />

the wild-type protein: use <strong>of</strong> a single fluorescent probe at the catalytic site.<br />

Proc Natl Acad Sci USA.1990;87:3562-3565.<br />

6. Curtin JA, Fridlyand J, Kageshita T, et al. Distinct sets <strong>of</strong> genetic<br />

alterations in melanoma. N Engl J Med. 2005;353:2135-2147.<br />

7. Curtin JA, Busam K, Pinkel D, et al. Somatic activation <strong>of</strong> KIT in<br />

distinct subtypes <strong>of</strong> melanoma. J Clin Oncol. 2006;24:4340-4346.<br />

8. Davies MA, Stemke-Hale K, Tellez C, et al. A novel AKT3 mutation in<br />

melanoma tumours and cell lines. Br J Cancer. 2008;99:1265-1268.<br />

9. Stahl JM, Sharma A, Cheung M, et al. Deregulated Akt3 activity<br />

promotes development <strong>of</strong> malignant melanoma. Cancer Res. 2004;64:7002-<br />

7010.<br />

10. Tsao H, Goel V, Wu H, et al. Genetic interaction between NRAS and<br />

BRAF mutations and PTEN/MMAC1 inactivation in melanoma. J Invest<br />

Dermatol. 2004;122:337-341.<br />

11. Dankort D, Curley DP, Cartlidge RA, et al. Braf(V600E) cooperates<br />

with Pten loss to induce metastatic melanoma. Nat Genet. 2009;41:544-552.<br />

12. Dhomen N, Reis-Filho JS, da Rocha Dias S, et al. Oncogenic Braf<br />

sents an ideal group for combination treatment approaches.<br />

Studies involving selective BRAF inhibitors with immunotherapy<br />

(ipilimumab, HD IL-2, PD1 pathway blockers),<br />

VEGF pathway inhibitors, or other molecularly targeted<br />

agents (MEK or PI3Kinase inhibitors or apoptosis inducers)<br />

are currently underway and represent opportunities to further<br />

advance treatment results.<br />

Options are more limited for patients with BRAF WT<br />

melanoma. For the few patients with mutations in C-Kit,<br />

imatinib or participation in a C-kit-inhibitor clinical trial<br />

seems to represent the best choice. For those with NRAS<br />

mutations, HD IL-2 might be a reasonable option, although<br />

data supporting this selection requires validation. Additional<br />

research is needed to determine the activity <strong>of</strong> ipilimumab<br />

or other immunotherapies in this population.<br />

Efforts are also underway to identify potential therapeutic<br />

targets downstream <strong>of</strong> NRAS or for BRAF, NRAS, or CKIT<br />

triple WT tumors that may allow for development <strong>of</strong> personalized<br />

treatment options for this patient population.<br />

Stock<br />

Ownership Honoraria<br />

Genentech;<br />

GlaxoSmithKline<br />

REFERENCES<br />

Roche<br />

Research<br />

Funding<br />

Expert<br />

Testimony<br />

Other<br />

Remuneration<br />

induces melanocyte senescence and melanoma in mice. Cancer Cell. 2009;15:<br />

294-303.<br />

13. Schwartzentruber DJ, Lawson DH, Richards JM, et al. Gp100 peptide<br />

vaccine and interleukin-2 in patients with advanced melanoma. N Engl<br />

J Med. 2011;364:2119-2127.<br />

14. Rosenberg SA, Yang JC, Sherry RM, et al. Durable complete responses<br />

in heavily pretreated patients with metastatic melanoma using T-cell transfer<br />

immunotherapy. Clin Cancer Res. 2011;17:4550-4557.<br />

15. Hodi FS, O’Day SJ, McDermott DF, et al. Improved survival with<br />

ipilimumab in patients with metastatic melanoma. N Engl J Med. 2010;363:<br />

711-723.<br />

16. Wolchok JD, Neyns B, Linette G, et al. Ipilimumab monotherapy in<br />

patients with pretreated advanced melanoma: A randomised, double-blind,<br />

multicentre, phase 2, dose-ranging study. Lancet Oncol. 2010;11:155-64.<br />

17. Lawrence DPH, McDermott DF. Phase II trial <strong>of</strong> ipilimumab monotherapy<br />

in melanoma patients with brain metastasis. J Clin Oncol. 2010;28<br />

(suppl; abstr 8523).<br />

18. Wolchok JD, Hoos A, O’Day S, et al. Guidelines for the evaluation <strong>of</strong><br />

immune therapy activity in solid tumors: immune-related response criteria.<br />

Clin Cancer Res. 2009;15:7412-7420.<br />

19. Robert C, Thomas L, Bondarenko I, et al. Ipilimumab plus dacarbazine<br />

for previously untreated metastatic melanoma. N Engl J Med. 364:2517-2526.<br />

20. Sharpe AHW, EJ, Ahmed R, Freeman GJ. The function <strong>of</strong> programmed<br />

cell death 1 and its ligands in regulating autoimmunity and infection. Nat<br />

Immun. 2007;8:239-245.<br />

21. Brahmer JRD, Wollner I, Powderly JD, et al. Phase I study <strong>of</strong> singleagent<br />

anti-programmed death-1 (MDX-1106) in refractory solid tumors:<br />

safety, clinical activity, pharmacodynamics, and immunologic correlates.<br />

J Clin Oncol. 2010;28:3167-3175.<br />

22. Sznol MH, Margolin K, McDermott D, et al. Phase I study <strong>of</strong> BMS-<br />

529

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