Prognostic significance of BRAF and NRAS mutations in melanoma: a German study from routine care View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2017-12

AUTHORS

Markus V. Heppt, Timo Siepmann, Jutta Engel, Gabriele Schubert-Fritschle, Renate Eckel, Laura Mirlach, Thomas Kirchner, Andreas Jung, Anja Gesierich, Thomas Ruzicka, Michael J. Flaig, Carola Berking

ABSTRACT

BACKGROUND: Hotspot mutations of the oncogenes BRAF and NRAS are the most common genetic alterations in cutaneous melanoma. Specific inhibitors of BRAF and MEK have shown significant survival benefits in large phase III trials. However, the prognostic significance of BRAF and NRAS mutations outside of clinical trials remains unclear. METHODS: The mutational status of BRAF (exon 15) and NRAS (exon 2 and 3) was determined in melanoma samples of 217 patients with pyrosequencing and Sanger sequencing. The genotypes were correlated with clinical outcomes and pathologic features of the primary tumors. Time to disease progression was calculated with the cumulative incidence function. Survival analyses were performed with Kaplan-Meier estimates and Cox proportional hazards regression analysis. Relative survival was calculated with the Ederer-II method. Treatment with BRAF and MEK inhibitors and immune checkpoint blockade (ICB) was allowed. RESULTS: Mutations in BRAF and NRAS were identified in 40.1 and 24.4% of cases, respectively. Concurrent mutations in both genes were detected in further 2.3%. The remaining 33.2% were wild type for the investigated exons (WT). BRAF mutations were significantly associated with younger age at first diagnosis (p < 0.001) and truncal localization of the culprit primary (p = 0.002). The nodular subtype was most common in the NRAS cohort. In addition, NRAS-mutant melanoma patients showed a higher frequency of nodal relapse (p = 0.013) and development of metastatic disease (p = 0.021). The time to loco-regional nodal relapse was shortest in NRAS-mutant melanoma (p = 0.002). Presence of NRAS mutation was an independent risk factor for disease progression in multivariate analysis (HR 2.01; 95% CI 1.02 - 3.98). BRAF-mutant melanoma patients showed a tendency for better overall and relative survival. Genotype was not a consistent risk factor in multivariate analysis. Instead, positive sentinel lymph node status (HR 2.65; 95% CI 1.15 - 6.10) and treatment with ICB in stage IV disease (HR 0.17; 95% CI 0.06-0.48) were significant multivariate risk factors. CONCLUSIONS: NRAS-mutant tumors tended to behave more aggressively particularly in early stages of the disease in this high-risk melanoma population. Treatment with immune checkpoint blockade improved survival in stage IV disease in a real-world setting. More... »

PAGES

536

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/s12885-017-3529-5

DOI

http://dx.doi.org/10.1186/s12885-017-3529-5

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1091144913

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/28797232


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