Cells derived from papillary carcinoma harboring the mutant BRAFV600E allele were slightly more sensitive to sorafenib than those harboring wildtype BRAF. Cell cycle analyses and caspase assays showed a sorafenib-dependent induction of apoptosis in all cell lines, whereas increased lactate dehydrogenase release suggested cell membrane disruption. This evidence concerns the gene BRAF and thyroid gland papillary carcinoma.