There were 378 tumor cases for which there was information for the main driver somatic mutations (TERTp, BRAF and RAS), gender and SLC5A5 expression. Of these, we eliminated 4 cases, for which the SLC5A5 expression was above the 99 percentile, being outliers. A total of 353 of the cases had information about tumor size, 362 had information for extrathyroidal extension, 282 had information for lymph node metastases (at the time of diagnosis) and all 374 had information about new tumor event (lymph node metastases or local recurrence (grouped in locoregional recurrence) and distant metastases). The SLC5A5 expression was inferred from RNA-seq data and quantification reflects reads per kilobase per million mapped reads (RPKM).