The CDx detects the following genes: single-nucleotide variations (SNVs), deletions and insertions in 23 genes in DNA isolated from FFPE tissue samples obtained from NSCLC patients with RET and ROS1 fusion in RNA, single-nucleotide sequence mutations, multiple-nucleotide sequence mutations, and deletion of the RET gene in DNA isolated from FFPE tissue samples obtained from medullary thyroid cancer patients with RET fusion in RNA isolated from FFPE tissue samples obtained from thyroid cancer patients. This evidence concerns the gene RET and thyroid gland carcinoma.