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Lung Cancer Health Center

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Stages of Lung Cancer

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What is staging of lung cancer?

The stage of a tumor refers to the extent to which lung cancer has spread in the body. Staging involves both evaluation of a tumor's size, as well as the presence or absence of metastases, or the spreading of the cancer, in the lymph nodes or in other organs. Staging is important for determining how a particular tumor should be treated. Staging of a tumor is also critical in estimating the prognosis of a given patient, with higher-stage tumors having a worse prognosis than lower-stage tumors.

Doctors use several tests to accurately stage lung cancer, including blood tests, X-rays, CT scans, bone scans, and PET scans. An abnormal blood chemistry test may signal the presence of metastases in the bone or liver. Radiological procedures document the size of a tumor, as well as its spread to other organs.

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Major drug companies continually research and develop new medications and treatments, which must be shown to be safe and effective before doctors can prescribe them to patients. Through lung cancerclinical trials, researchers test the effects of new drugs on a group of volunteers with lung cancer. Following a strict protocol and using carefully controlled conditions, researchers evaluate the investigational drugs under development and measure the ability of the new drug to treat lung cancer, its...

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Non-small cell lung cancers (NSCLC) are assigned a stage from I to IV in order of severity.

  • In stage I, the cancer is confined to the lung.
  • In stages II and III, the cancer is confined to the lung and, possibly, the lymph nodes.
  • Stage IV cancer has spread outside of the lung to other parts of the body.

Small cell lung cancers (SCLC) are staged using a two-tiered system:

  • Limited stage (LS) SCLC refers to cancer that is confined to its area of origin in the lung and lymph nodes.
  • In extensive-stage (ES) SCLC, the cancer has spread beyond the lung to other parts of the body.

 

WebMD Medical Reference from MedicineNet

Reviewed by William Blahd, MD on January 18, 2016
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