Stage III is divided into stages III, IIIE, IIIS, and IIIE+S. In stage III, cancer is found in one or more lymph node groups above and below the diaphragm (the thin muscle below the lungs that helps breathing and separates the chest from the abdomen). In stage IIIE, cancer is found in lymph node groups above and below the diaphragm and outside the lymph nodes in a nearby organ or area. In stage IIIS, cancer is found in lymph node groups above and below the diaphragm and in the spleen. In stage IIIE+S, cancer is found in lymph node groups above and below the diaphragm, in a nearby area or organ, and in the spleen.