ROS1 and non-small cell lung carcinoma: With quantitative real-time reverse transcriptase PCR (qRT-PCR) and RT-PCR, Yan’s group observed an ROS1-rearranged incidence of 1% (11 of 1139 cases) and with IHC, FISH and RT-PCR, Rimkunas and his co-workers reported that 1.6% (9 of 556 cases) of NSCLC cases were ROS1 rearrangement [22,39].