Imatinib in advanced gastrointestinal stromal tumour: when is 800 mg the correct dose?

Abstract:

PURPOSE OF REVIEW:Gastrointestinal stromal tumour patients with exon 9 KIT mutations have a worse outcome, but progression-free survival is improved by treatment with imatinib 800 mg daily. This review looks at the evidence and asks whether this should be standard treatment from diagnosis. RECENT FINDINGS:The phase III trial in advanced gastrointestinal stromal tumour, EORTC 62005, demonstrated increased progression-free survival for imatinib 800 mg daily versus 400 mg. Mutational analysis showed the benefit was primarily due to patients with exon 9 mutations. A meta-analysis has confirmed this finding. Patients who progress on standard dose imatinib may also experience disease stabilization. The significance of this in relation to data on pharmacokinetics and secondary mutations will be discussed. SUMMARY:Mutational analysis of KIT and PDGFRA should ideally be performed in all patients with advanced gastrointestinal stromal tumour. Patients with mutations in exon 9 of KIT should be considered for treatment with imatinib 800 mg daily, but current data do not indicate whether there is a survival advantage for immediate treatment at 800 mg. There still appears to be a role for the higher dose in patients progressing after an initial response to the standard dose therapy.

journal_name

Curr Opin Oncol

authors

Judson I

doi

10.1097/CCO.0b013e328302ed96

subject

Has Abstract

pub_date

2008-07-01 00:00:00

pages

433-7

issue

4

eissn

1040-8746

issn

1531-703X

pii

00001622-200807000-00015

journal_volume

20

pub_type

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