4.6 Review

TKI Treatment Sequencing in Advanced Gastrointestinal Stromal Tumors

Journal

DRUGS
Volume -, Issue -, Pages -

Publisher

ADIS INT LTD
DOI: 10.1007/s40265-022-01820-1

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Prior to the early 2000s, patients with advanced GIST had poor prognoses due to lack of effective therapies. Tyrosine kinase inhibitors significantly improved the overall survival for these patients. This review discusses the studies that led to the approval of specific targeted therapies for different molecular subtypes of GIST, as well as their impact on future therapeutic approaches.
Prior to the early 2000s, patients with advanced gastrointestinal stromal tumors (GIST) had very poor prognoses owing to a lack of effective therapies. The development of tyrosine kinase inhibitors at the turn of the century significantly improved the overall survival for patients with GIST. The resounding success of imatinib in the first clinical trial of a tyrosine kinase inhibitor to treat GIST led to its approval for first-line therapy for advanced GIST; this study was open to all comers and not restricted to any GIST subtype(s). The trials that led to the approvals of second-, third-, and fourth-line therapy for advanced GIST were also open to all patients with advanced/metastatic GIST. Only in retrospect do we realize the role that the molecular subtypes played in the results observed in these studies. In this review, we discuss the studies that led to the US Food and Drug Administration approval of imatinib (first line), sunitinib (second line), regorafenib (third line), and ripretinib (fourth line) for advanced KIT-mutant GIST. In addition, we review how information about GIST molecular subtypes has been used to accelerate the approval of other targeted therapies for non-KIT mutant GIST, leading to the approval of five additional drugs indicated for the treatment of specific GIST molecular subtypes. We also discuss how our understanding of the molecular subtypes will play a role in the next generation of therapeutic approaches for treating advanced GIST.

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