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	Vol	Issue	Date	Pages	Journal Short Title
Annals of surgical oncology	23	6	2016 Jun	1924-7	Ann Surg Oncol

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

Gene	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 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
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