n one lung and in lymph nodes on the same side of the chest.
If the cancer has spread to the other lung, to lymph nodes on the other side of the chest, or to distant organs, it is called extensive. Small cell lung cancer is staged in this way because it helps to determine the best treatment for each group. Many people with small cell lung cancer will already have extensive disease when it is found.
The staging system most often used for non-small cell lung cancer is the TNM system, also known as the American Joint Committee on Cancer (AJCC) system.
T stands for tumor (its size and how far it has spread within the lung and to nearby organs)
M stands for metastasis (spread to distant organs)
All of this information is combined and a stage is assigned. The stages are described using Roman numerals 0-IV (1-4). In general, the lower the number, the le
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