To the Editor The study by Dr Xing and colleagues1 explored the association between the BRAF V600E mutation and mortality in patients with papillary thyroid cancer (PTC) in a large retrospective cohort of 1849 patients from 13 centers worldwide. The authors concluded that the BRAF mutation was significantly associated with cancer-related mortality.
However, this work actually demonstrates that the BRAF mutation is just a marker of aggressiveness and not a true prognostic factor because it was significantly associated with aggressive features and mortality in the bivariable analysis. When other clinical variables were entered in the analysis, the correlation disappeared. Therefore, the way the data were described and the conclusion may be misleading.
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