MedicalTerminology DB
Cancer & Tumors Cancer & Oncology Lungs & Breathing

stage IB non-small cell lung cancer

Meaning of stage IB non-small cell lung cancer: Stage I non-small cell lung cancer is divided into stages IA and IB.

Definition of stage IB non-small cell lung cancer

Stage I non-small cell lung cancer is divided into stages IA and IB. In stage IB, cancer has not spread to the lymph nodes and one or more of the following is true: (1) the tumor is larger than 3 centimeters but not larger than 5 centimeters; (2) cancer has spread to the main bronchus and is at least 2 centimeters below where the trachea joins the bronchus; (3) cancer has spread to the innermost layer of the membrane that covers the lung; and/or (4) part of the lung has collapsed or become inflamed.

Written and maintained by James Murray Last updated July 21, 2026 Educational reference, not medical advice. Read the limitations.

For learning, not diagnosis. This glossary provides general educational information and is not a substitute for advice from a qualified healthcare professional. If you may be experiencing a medical emergency, contact local emergency services.