This research is all about investigating a potential treatment for a specific type of advanced lung cancer. The cancer cells have a protein called c-Met that's acting a bit too excited, driving the cancer to spread and resist treatment. This study focuses on two treatments: one is called Telisotuzumab Vedotin (ABBV-399), which is a smart combination of an antibody and a drug that can stop this protein's activity. The other treatment is called Docetaxel. The researchers have already found in smaller studies that Telisotuzumab Vedotin could be promising for this type of cancer, especially in patients whose previous treatments didn't work well. Now they want to see if it can really make a difference in the long run. They'll be comparing Telisotuzumab Vedotin and Docetaxel to figure out which one is better at helping patients live longer without their cancer getting worse. In this study, participants will be randomly divided into two groups, like flipping a coin. One group will get a new medicine called telisotuzumab vedotin through a vein in their arm every two weeks. The other group will receive a treatment called docetaxel through a vein every three weeks. People in both groups will keep getting their assigned treatment until their doctors say it's time to stop based on certain criteria. Throughout the study, participants will have scans like X-rays or MRIs to see how their tumors are doing. These scans will happen at the beginning and then every few weeks for the first year, and less often as time goes on.Even if someone stops their treatment for a reason other than their cancer getting worse on these scans, the researchers will keep track of them until their cancer gets worse or until they decide they don't want to be in the study anymore.The whole study is expected to last around 38 months, which is a little over 3 years. They'll keep following up with the participants, either by talking to them, checking their medical records, or other appropriate methods, until the participants decide to leave the study or pass away. This study is a big step towards finding better options for people battling this tough form of lung cancer.