Imatinib dose escalation versus sunitinib as a second line treatment in KIT exon 11 mutated GIST: a retrospective analysis
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Bruno Vincenzi1, Margherita Nannini2, Elena Fumagalli3, Giuseppe Bronte4, Anna Maria Frezza1, Delia De Lisi1, Mariella Spalato Ceruso1, Daniele Santini1, Giuseppe Badalamenti4, Maria Abbondanza Pantaleo2, Antonio Russo4, Angelo Paolo Dei Tos5, Paolo Casali3, Giuseppe Tonini1
1Department of Oncology, University Campus Bio-Medico, Rome, Italy
2Department of Specialized, Experimental and Diagnostic Medicine, Sant’Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy
3Adult Mesenchymal Tumor Medical Oncology Unit, Fondazione IRCCS Istituto Nazionale Tumori, Milan, Italy
4Section of Medical Oncology, Department of Surgical, Oncological and Oral Sciences, University of Palermo, Palermo, Italy
5Department of Oncology and Pathology, General Hospital of Treviso, Treviso, Italy
Antonio Russo, e-mail: firstname.lastname@example.org
Bruno Vincenzi, e-mail: email@example.com
Keywords: imatinib, sunitinib, second line, GIST, exon 11
Received: July 03, 2015 Accepted: August 04, 2015 Published: September 26, 2015
We retrospectively reviewed data from 123 patients (KIT exon 11 mutated) who received sunitinib or dose-escalated imatinib as second line.
All patients progressed on imatinib (400 mg/die) and received a second line treatment with imatinib (800 mg/die) or sunitinib (50 mg/die 4 weeks on/2 off or 37.5 mg/day). Deletion versus other KIT 11 mutation was recorded, correlated with clinical benefits.
64% received imatinib, 36% sunitinib. KIT exon 11 mutation was available in 94 patients. With a median follow-up of 61 months, median time to progression (TTP) in patients receiving sunitinib and imatinib was 10 (95% CI 9.7–10.9) and 5 months (95% CI 3.6–6.7) respectively (P = 0.012). No difference was found in overall survival (OS) (P = 0.883). In imatinib arm, KIT exon 11 deletions was associated with a shorter TTP (7 vs 17 months; P = 0.02), with a trend in OS (54 vs 71 months P = 0.063). No difference was found in patients treated with sunitinib (P = 0.370).
A second line with sunitinib was associated with an improved TTP in KIT exon 11 mutated patients progressing on imatinib 400 mg/die. Deletions in exon 11 seemed to be correlated with worse outcome in patients receiving imatinib-based second line.
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