The most commonly used system for staging NSCLC is the American Joint Committee on Cancer (AJCC) TNM system, which is based on 3 key pieces of information:
The size and extent of the main tumor (T): How large is the tumor and whether it is has it grown into nearby structures or organs
The spread to nearby lymph nodes (N).
The spread (metastasis) to distant sites (M): Has the cancer spread to distant organs such as the brain, bones, adrenal glands, kidneys, liver, or the other lung?
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