Dufresne A, Bertucci F, Penel N, Le Cesne A, Bui B, Tubiana-Hulin M, Ray-Coquard I, Cupissol D, Chevreau C, Perol D, Goncalves A, Jimenez M, Bringuier PP, Blay JY. Identification of biological factors predictive of response to imatinib mesylate in aggressive fibromatosis.
Br J Cancer 2010;
103:482-5. [PMID:
20664593 PMCID:
PMC2939782 DOI:
10.1038/sj.bjc.6605783]
[Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Background:
Imatinib induces responses and disease stabilisations in non-resectable patients with aggressive fibromatosis (AF). The precise target of imatinib in AF and predictive factors for response to treatment are unknown.
Methods:
We investigated factors potentially predictive of response to imatinib in a series of 40 patients with progressive AF included in a phase II trial of imatinib: we tested the presence of KIT exon 10 variant (M541L), the expression of imatinib-sensitive kinases and cell cycle proteins by immunohistochemistry (IHC), and other clinical and biological factors.
Results:
Of 10 patients for whom DNA could be extracted, 3 had a KIT exon 10 variant (30%), with no correlation with response or progression-free survival (PFS). The expression of other imatinib targets (PDGFRA/B, macrophage colony-stimulating factor receptor (M-CSFR)) and of downstream components of the cell cycle, cell proliferation and proliferation pathway (cyclin D1, ERK, MEK 1–2) did not correlate with PFS. Pre-treatment lymphopenia (<1500/μl) and tumour size >120 mm correlated with shorter PFS in univariate and multivariate analyses.
Conclusion:
Our findings show that a baseline biological characteristic of the patient is the major parameter influencing response to imatinib in aggressive fibromatosis. Tumour characteristics, including the presence of a KIT exon 10 M541L variant, may influence tumour control but this needs to be confirmed and better explained.
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