ArticleWorld journal of gastrointestinal oncology2025
Significance of monitoring imatinib plasma concentration in second-line treatment decisions for
Article in World journal of gastrointestinal oncology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundFor patients with advanced gastrointestinal stromal tumors (GISTs) carrying the c-kit exon 11 mutation, imatinib (IM) at a standard dosage of 400 mg per day is the preferred first-line treatment. In cases where treatment with IM fails, there is an urgent need for a more precise assessment method to determine whether to switch therapies or escalate the IM dosage. This approach will enhance clinical decision-making and optimize patient outcomes.
aimTo investigate IM plasma concentration's role in second-line treatment decisions for c-kit 11-mutated advanced GISTs post-IM failure.
methodsPatients with advanced GIST harboring c-kit 11 mutation who experienced failure with IM 400 mg per day as first-line treatment at our hospital were retrospectively analyzed. Patients were categorized into a low plasma (LP) concentration group (LP group, < 1100 ng/mL) and high plasma (HP) concentration group (HP group, ≥ 1100 ng/mL). Each group was further subdivided into Group A (dose-escalation group) and Group B (drug-switch group). Baseline characteristics were compared and Kaplan-Meier curves were used to analyze the survival of patients.
resultsSeventy-five patients were included in the analysis. For the LP group (
conclusionIncreasing IM dosage for c-kit 11-mutated advanced GISTs post-IM failure may prolong OS if plasma concentration is < 1100 ng/mL. Switching tyrosine kinase inhibitors may improve DCR and PFS if ≥ 1100 ng/mL.
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