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2012 EDUCATIONAL BOOK - American Society of Clinical Oncology

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TKI-RESISTANT GIST<br />

Table 2. <strong>Clinical</strong> outcomes following surgery for TKI treated patients (pts) with advanced GIST. Median progression-free and<br />

overall-survival data are tabulated based on the immediate pre-surgery response status <strong>of</strong> patients to TKI therapy. a<br />

Progression-Free Survival Overall Survival<br />

Study Pt # Treatment Status<br />

Stableb Limitc Gend Stableb Limitc Gend Raut (28) 69 IM 45 pts IM 3 SU 21 pts �40 mo. 8 mo. 3 mo. �40 mo. 30 mo. 6 mo.<br />

Dematteo (30) 40 IM 37 pts IM 3 SU 3 pts �48 mo. 12 mo. 3 mo. �48 mo. 19 mo. 11 mo.<br />

Raut (29) 50 IM 3 SU 50 pts 11 mo. 4 mo. 4 mo. �36 mo. 19 mo. 9 mo.<br />

a IM (surgery during front-line imatinib therapy). IM 3 SU (surgery during second-line sunitinib).<br />

b Stable or responsive disease prior to surgery.<br />

c Limited or focal disease progression prior to surgery.<br />

d Generalized disease progression prior to surgery.<br />

complications from surgery, and it is important to keep in<br />

mind that surgical complications usually lead to a delay in<br />

restarting systemic therapy. Therefore, only for patients with<br />

primary disease, or for symptom control in advanced disease,<br />

is surgery generally recommended as a treatment strategy.<br />

Conclusion<br />

The knowledge <strong>of</strong> the biology <strong>of</strong> GIST has made this<br />

cancer a model <strong>of</strong> targeted therapy with tyrosine kinase<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 />

Christine M. Barnett*<br />

Michael C. Heinrich MolecularMD;<br />

Novartis; Pfizer<br />

*No relevant relationships to disclose.<br />

1. Corless CL, Fletcher JA, Heinrich MC. Biology <strong>of</strong> gastrointestinal<br />

stromal tumors. J Clin Oncol. 2004;22:3813-3825.<br />

2. Miettinen M, Sobin LH, Sarlomo-Rikala M. Immunohistochemical spectrum<br />

<strong>of</strong> GISTs at different sites and their differential diagnosis with a<br />

reference to CD117 (KIT). Mod Pathol. 2000;13:1134-1142.<br />

3. Corless CL, Barnett CM, Heinrich MC. Gastrointestinal stromal tumours:<br />

origin and molecular oncology. Nat Rev Cancer. 2011;11:865-878.<br />

4. Duensing A, Joseph NE, Medeiros F, et al. Protein Kinase C theta<br />

(PKCtheta) expression and constitutive activation in gastrointestinal stromal<br />

tumors (GISTs). Cancer Res. 2004;64:5127-5131.<br />

5. Druker BJ, Tamura S, Buchdunger E, et al. Effects <strong>of</strong> a selective<br />

inhibitor <strong>of</strong> the Abl tyrosine kinase on the growth <strong>of</strong> Bcr-Abl positive cells. Nat<br />

Med. 1996;2:561-566.<br />

6. Heinrich MC, Griffith DJ, Druker BJ, et al. Inhibition <strong>of</strong> c-kit receptor<br />

tyrosine kinase activity by STI 571, a selective tyrosine kinase inhibitor.<br />

Blood. 2000;96:925-932.<br />

7. Tuveson DA, Willis NA, Jacks T, et al. STI571 inactivation <strong>of</strong> the<br />

gastrointestinal stromal tumor c-KIT oncoprotein: biological and clinical<br />

implications. Oncogene. 2001;20:5054-5058.<br />

8. van Oosterom AT, Judson I, Verweij J, et al. Safety and efficacy <strong>of</strong><br />

imatinib (STI571) in metastatic gastrointestinal stromal tumours: a phase I<br />

study. Lancet. 2001;358:1421-1423.<br />

9. Blanke CD, Demetri GD, von Mehren M, et al. Long-term results from a<br />

randomized phase II trial <strong>of</strong> standard- versus higher-dose imatinib mesylate<br />

for patients with unresectable or metastatic gastrointestinal stromal tumors<br />

expressing KIT. J Clin Oncol. 2008;26:620-625.<br />

10. Comparison <strong>of</strong> two doses <strong>of</strong> imatinib for the treatment <strong>of</strong> unresectable<br />

or metastatic gastrointestinal stromal tumors: A meta-analysis <strong>of</strong> 1,640<br />

patients. J Clin Oncol. 2010;28:1247-1253.<br />

11. Le Cesne A, Ray-Coquard I, Bui BN, et al. Discontinuation <strong>of</strong> imatinib<br />

in patients with advanced gastrointestinal stromal tumours after 3 years <strong>of</strong><br />

treatment: an open-label multicentre randomised phase 3 trial. Lancet Oncol.<br />

2010;11:942-949.<br />

12. von Mehren M, Heinrich MC, Joensuu H, et al. Follow-up results after<br />

9 years (yrs) <strong>of</strong> the ongoing, phase II B2222 trial <strong>of</strong> imatinib mesylate (IM) in<br />

inhibitors. Currently, the mainstay <strong>of</strong> treatment for this<br />

disease is TKI-based therapy with enrollment in a clinical<br />

trial if multiple TKIs fail to control disease. Understanding<br />

the mechanisms <strong>of</strong> disease persistence and drug resistance<br />

has helped identify new targets for therapy. Hopefully, our<br />

increased understanding <strong>of</strong> GIST biology will not only help<br />

us improve current treatment, but ultimately help create<br />

new treatments that might cure patients with advanced<br />

disease.<br />

Stock<br />

Ownership Honoraria<br />

Research<br />

Funding<br />

MolecularMD Novartis ARIAD; Arog;<br />

ImClone<br />

Systems;<br />

Novartis; Pfizer<br />

REFERENCES<br />

Expert<br />

Testimony<br />

Other<br />

Remuneration<br />

patients (pts) with metastatic or unresectable KIT� gastrointestinal stromal<br />

tumors (GIST). J Clin Oncol. 2011;29 (suppl; abstr 10016).<br />

13. Heinrich MC, Corless CL, Demetri GD, et al. Kinase mutations and<br />

imatinib response in patients with metastatic gastrointestinal stromal tumor.<br />

J Clin Oncol. 2003;21:4342-4349.<br />

14. Demetri GD, Wang Y, Wehrle E, et al. Imatinib plasma levels are<br />

correlated with clinical benefit in patients with unresectable/metastatic<br />

gastrointestinal stromal tumors. J Clin Oncol. 2009;27:3141-3147.<br />

15. Antonescu CR, Besmer P, Guo T, et al. Acquired resistance to imatinib<br />

in gastrointestinal stromal tumor occurs through secondary gene mutation.<br />

Clin Cancer Res. 2005;11:4182-4190.<br />

16. Liegl B, Kepten I, Le C, et al. Heterogeneity <strong>of</strong> kinase inhibitor<br />

resistance mechanisms in GIST. J Pathol. 2008;216:64-74.<br />

17. Demetri GD, van Oosterom AT, Garrett CR, et al. Efficacy and safety <strong>of</strong><br />

sunitinib in patients with advanced gastrointestinal stromal tumour after<br />

failure <strong>of</strong> imatinib: a randomised controlled trial. Lancet. 2006;368:1329-<br />

1338.<br />

18. George S, Blay JY, Casali PG, et al. <strong>Clinical</strong> evaluation <strong>of</strong> continuous<br />

daily dosing <strong>of</strong> sunitinib malate in patients with advanced gastrointestinal<br />

stromal tumour after imatinib failure. Eur J Cancer. 2009;45:1959-1968.<br />

19. Gramza AW, Corless CL, Heinrich MC. Resistance to tyrosine kinase<br />

inhibitors in gastrointestinal stromal tumors. Clin Cancer Res. 2009;15:7510-<br />

7518.<br />

20. Demetri GD, von Mehren M, Antonescu CR, et al. NCCN Task Force<br />

report: update on the management <strong>of</strong> patients with gastrointestinal stromal<br />

tumors. J Natl Compr Canc Netw. 2010;8 Suppl 2:S1-41; quiz S2-4.<br />

21. Bauer S, Yu LK, Demetri GD, et al. Heat shock protein 90 inhibition in<br />

imatinib-resistant gastrointestinal stromal tumor. Cancer Res. 2006;66:9153-<br />

9161.<br />

22. Heinrich MC, Corless CL, Duensing A, et al. PDGFRA activating<br />

mutations in gastrointestinal stromal tumors. Science. 2003;299:708-710.<br />

23. Demetri GD, Casali PG, Blay JY, et al. A phase I study <strong>of</strong> single-agent<br />

nilotinib or in combination with imatinib in patients with imatinib-resistant<br />

gastrointestinal stromal tumors. Clin Cancer Res. 2009;15:5910-5916.<br />

24. Reichardt P, Blay J, Gelderblom H, et al. Phase III trial <strong>of</strong> nilotinib in<br />

667

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