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Step 1
Lung cancer is diagnosed as being in Stage I when it is confined to the lung area.
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Step 2
Stage II cancer has spread but is confined to the chest.
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Step 3
Stage III non-small cell lung cancer is also confined to the chest, but this stage refers to larger and more invasive tumors.
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Step 4
Stage IV cancer is defined as having spread from the chest area to other parts of the body.
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Step 1
There are only two stages of small cell lung cancer: limited stage and extensive stage.
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Step 2
Cancer is considered at limited stage when it is confined to the area in the chest where it originated.
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Step 3
Extensive stage small cell lung cancer refers to cancer that has spread beyond its point of origin to other parts in the body.








