Stage of lung cancer, another name for stage 4 lung cancer, is an advanced stage of the disease. When lung cancer reaches stage 4, it has progressed to other body parts from its original location in the lung. When cancer cells split off from the primary tumor and travel throughout the body through the blood or lymphatic system, this is known as metastasis. In order to create new metastatic lung cancer life, the cancer cells frequently spread from the lung to the brain, bones, liver, and adrenal glands.
