How Advanced is The Cancer?
How extensive or advanced a cancer is can be determined by “staging,” which is important in determining the proper treatment approach. NSCLC is staged according to tumor size, whether lymph nodes are affected, and whether the cancer has spread (metastasized). NSCLC has five stages, numbered 0 through IV, with 0 being the earliest stage and having the best chance of cure and IV being the most advanced.
SCLC is divided into two stages: limited disease (25 to 30 percent of cases), in which the cancer is limited to the chest and nearby lymph nodes, and extensive disease (70 to 75 percent of cases), in which the cancer extends beyond the chest.