RET and non-small cell lung carcinoma: Some of the rare oncogene-dependent NSCLC subgroups, such as RET (rearrangement during transfection) or ROS1 (c-ros oncogene 1) rearrangements, or BRAF (v-Raf mouse sarcoma virus oncogene homolog B) mutations, share a frequency range with rare EGFR mutations, such as exon 18 G719X or exon 20 S768I [2].