Some people with NSCLC have a change in their DNA that causes their cancer to start growing. These changes can include things like ‘mutations’ (where a small bit of the DNA changes) and ‘fusions’ of different parts of your DNA (where two different pieces of DNA stick together incorrectly). These changes are given names based on what part of the DNA they happen in. Some examples of this are ALK+, RET+, and ROS1+ NSCLC.