If you or a loved one have been diagnosed with stage 4 lung cancer, one of the first questions that comes to mind may be, "What is stage 4 lung cancer life expectancy?" While cancers that are stage 4 have the reputation of being "bad," you may wonder what this really means. Those who suddenly learn they have stage 4 lung cancer are not alone. Roughly 40 percent of people with lung cancer are diagnosed when their cancer is already stage 4, which means that the cancer has metastasized (spread) throughout the body.1 For example, tumors may be present in...