NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,779 terms related to cancer and medicine.

Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.

stage IA non-small cell lung cancer
(... sel lung KAN-ser)
Stage I non-small cell lung cancer is divided into stages IA and IB. In stage IA, the tumor is in the lung only and is 3 centimeters or smaller.

EnlargeTwo-panel drawing of stage I non-small cell lung cancer. First panel shows stage IA with cancer (3 cm or less) in the right lung; also shown are the right main bronchus, trachea, lymph nodes, bronchioles, and diaphragm. Second panel shows stage IB with cancer (more than 3 cm but not more than 5 cm) in the left lung and in the left main bronchus; the carina is also shown. Inset shows cancer that has spread from the lung into the innermost layer of the lung lining; a rib is also shown.

Stage I non-small cell lung cancer. In stage IA, cancer is in the lung only and is 3 cm or smaller. In stage IB, the cancer is (a) larger than 3 cm but not larger than 5 cm, (b) has spread to the main bronchus, and/or (c) has spread to the innermost layer of the lung lining. Part of the lung may have collapsed or become inflamed (not shown).