Whether or not it has spread to the lymph nodes in your lung or chest or anywhere else in your body.
Taking out the lung with the tumor in it can help some of your lung cancer symptoms get better or even go away. Unfortunately, in many patients, the cancer does come back at some time in the future. Since this depends on many things, you should talk with your healthcare providers about your particular situation. It's important that you and your doctor have the same pneumonectomy expectations.