• Step hidden. Cancer cells are found in sputum, but you can not find any tumor in the lung.
• Stage 0. The cancer is localized in one area, in some cell layers only, and no growth through the lining of the lung. Another term for this type of lung cancer is “carcinoma in situ.”
• Stage I. The cancer is found only in the lung and is surrounded by normal tissue. * Stage II The cancer has spread to nearby lymph nodes.
• Stage III. The cancer has spread to the chest wall or diaphragm near the lung, or the cancer has spread to lymph nodes in the area that separates the two lungs (mediastinum) lymph nodes or across the chest, or neck.
• Stage IV. The cancer has spread to other parts of the body. Recurrent cancer has returned after being treated.

In the classification of lung cancer small cell stage talks that follow:

• Limited Stage Cancer is found only in one lung and nearby lymph nodes.
• Extensive Stage Cancer has spread outside the lung where it originated to other tissues of the chest or other body parts.
• Step appellant. The disease has recurred after being treated, whether in the lungs or other body part.
• Step appellant. The disease has recurred after being treated, whether in the lungs or other body part.

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