BRAF mutations,microsatellite instability status and cyclin D1 expression predict metastatic colorectal patients' outcome |
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Authors: | Z Saridaki D Papadatos-Pastos M Tzardi D Mavroudis E Bairaktari H Arvanity E Stathopoulos V Georgoulias J Souglakos |
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Institution: | 1.Laboratory of Tumor Cell Biology, School of Medicine, University of Crete, Crete, Greece;2.Department of Medical Oncology, University General Hospital, Heraklion, Crete, Greece;3.Laboratory of Pathology, University General Hospital, Heraklion, Crete, Greece |
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Abstract: | Background: The significance of BRAF mutations, microsatelite instability (MSI) status and cyclin D1 expression in patients with metastatic colorectal cancer (mCRC) was evaluated.Methods: Primary tumours from 144 patients treated for mCRC were assessed for BRAF (V600E) mutation, MSI status and cyclin D1. The data were correlated with progression-free survival (PFS) and overall survival (OS).Results: BRAF mutations were detected in 10 (out of 22, 45%) patients with MSI-H tumours compared with 2 (out of 122, 1.6%) in those with microsatellite stable tumours (P<0.001). The presence of BRAF mutations was correlated with cyclin D1 overexpression (7 out of 26 patients, 58% vs 5 out of 118 patients, 14% P=0.001). Patients with BRAF-mutated primary tumours had a significantly decreased PFS (2.7 vs 9.8 months; P<0.001) and median OS (14 vs 30 months; P<0.001) than patients with wild-type (wt) tumours. Patients with MSI-H and BRAF-mutated tumours experienced significantly lower PFS (3.1 vs 11.4 months; P=0.008) and OS (14.5 vs 35.5 months; P=0.004) than patients with MSI-H and BRAF wt tumours. Similarly, BRAF mutations and cyclin D1 overexpression were correlated with decreased PFS (3.1 vs 8.6 months; P=0.03) and OS (17.8 vs 39.2 months; P=0.01).Conclusion: BRAF V600E mutations are associated with MSI-H status and cyclin D1 overexpression and characterize a subgroup of patients with poor prognosis. |
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Keywords: | BRAF mutations MSI status cyclin D1 expression metastatic CRC |
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