What causes ROS1+ and ALK+ NSCLC?

Genomic changes in ROS1 and ALK (sometimes called fusions or alterations) are found in some people with NSCLC. They occur when parts of one gene fuse with another, creating abnormal signals that cause cells to grow out of control and form cancer. These changes are usually found when the cancer is already advanced—either stage 3 (locally advanced) or stage 4 (metastatic).

Here are a few important things to know about ROS1 and ALK changes:
  • No smoking icon May be seen in people with no history of smoking
  • Not inherited icon Not inherited or passed down
  • Identifying icon Identifying these genomic changes matters—because treatments can differ