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Long Term Response on Regorafenib in non-V600E BRAF Mutated Colon Cancer: A Case Report

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Case Reports

Long Term Response on Regorafenib in non-V600E BRAF Mutated Colon Cancer: A Case Report

Eduard Callebout et al. BMC Cancer.

Abstract

Background: Non-V600E BRAF mutated colorectal cancer (CRC) is a rare disease entity with specific clinical features. These tumors are less likely to have microsatellite instability than CRC with a V600E BRAF mutation and often harbor a KRAS or NRAS mutation. Notably, median overall survival is longer than in wild-type BRAF CRC. Little is known about treatment possibilities in these patients.

Case presentation: We present the case of a 59 year old patient with a rare mutation in BRAF codon 594, who progressed rapidly on all classical therapies but experienced a clear and long lasting response on treatment with Regorafenib.

Conclusion: Little is known about therapies that can be effective in the rare non-V600E BRAF mutated CRCs. We present a patient who had a definite response to treatment with Regorafenib. There are no predictive markers that define a subset of CRC patients who benefit most from Regorafenib. The specific features of this non-V600E BRAF mutated CRC may be relevant in the exploration of predictive biomarkers for the efficacy of Regorafenib.

Keywords: Case report; Colon cancer; Epithelial to mesenchymal transition; Non-V600E BRAF mutation; Regorafenib.

Conflict of interest statement

The authors declare that they have no competing interests.

Figures

Fig. 1
Fig. 1
Evolution of periampullary adenopathies on reintroduction of regorafenib. A In january 2017 periampullary adenopathies were seen on follow-up CT-scan. B CT-scan after 6 months of treatment with regorafenib shows a partial response
Fig. 2
Fig. 2
Timeline 2014–2018: Disease characteristics, disease evolution (left column) and therapeutic interventions (right column)

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