Reference Detail

Ref Type Journal Article
PMID (26861905)
Authors Kasper B, Gruenwald V, Reichardt P, Bauer S, Hohenberger P, Haller F
Title Correlation of CTNNB1 Mutation Status with Progression Arrest Rate in RECIST Progressive Desmoid-Type Fibromatosis Treated with Imatinib: Translational Research Results from a Phase 2 Study of the German Interdisciplinary Sarcoma Group (GISG-01).
Journal Annals of surgical oncology
Vol 23
Issue 6
Date 2016 Jun
URL
Abstract Text CTNNB1 gene mutations are the molecular key events in the majority of sporadic desmoid-type fibromatosis (DF). The specific S45F mutation has been reported to be associated with a more aggressive clinical course in DF. For the current study, the CTNNB1 mutation status was analyzed in DF samples from the prospective German Interdisciplinary Sarcoma Group (GISG) phase 2 study evaluating imatinib to induce progression arrest in DF Response Evaluation Criteria In Solid Tumors (RECIST) progressive patients.Thirty-seven patients were treated with a planned dose of imatinib 800 mg daily over 2 years (NCT01137916). The progression arrest rate (PAR) after 6 months of treatment was the primary endpoint of the study. CTNNB1 exon 3 mutation status was analyzed using Sanger sequencing.Thirty-three (97 %) of 34 patients reaching the primary endpoint were evaluable for CTNNB1 mutation exon 3 status. T41A mutations accounted for 30.3 % of the study samples and S45 mutations for 48.5 %, whereas CTNNB1 wild-type status was found in 21.2 %. The respective PAR at 6 months was 70, 81, and 43 %. Patients harboring CTNNB1 mutations demonstrated a higher PAR compared to wild-type DF. There was a statistically significant difference comparing patients with S45F mutations (85 % PAR) versus wild-type status (p = 0.05).Mutations at position S45 were overrepresented in the GISG-01 trial recruiting RECIST progressive patients only. The positive correlation of CTNNB1 mutation status with the progression arrest rate after imatinib therapy supports the idea of a potential predictive impact of the mutation status on DF treatment decision making.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
CTNNB1 T41A desmoid tumor sensitive Imatinib Clinical Study - Cohort Actionable In a retrospective analysis, patients with desmoid fibromatosis harboring CTNNB1 T41A demonstrated a greater progression arrest rate at 6 months (70%) compared to patients with CTNNB1 wild-type (45%) when treated with Gleevec (imatinib) (PMID: 26861905). 26861905
CTNNB1 S45F desmoid tumor sensitive Imatinib Clinical Study - Cohort Actionable In a retrospective analysis, patients with desmoid fibromatosis harboring CTNNB1 S45F demonstrated a greater progression arrest rate at 6 months compared to CTNNB1 wild-type patients (85% vs 43%, p=0.05) when treated with Gleevec (imatinib) (PMID: 26861905). 26861905
CTNNB1 act mut desmoid tumor sensitive Imatinib Clinical Study - Cohort Actionable In a retrospective analysis, patients with desmoid fibromatosis harboring CTNNB1 activating exon 3 mutations demonstrated a greater progression arrest rate at 6 months compared to patients with CTNNB1 wild-type tumor when treated with Gleevec (imatinib) (PMID: 26861905). 26861905