stage IB 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 IB, the tumor is larger than 3 centimeters but not larger than 4 centimeters. Cancer has not spread to the lymph nodes; OR the tumor is 4 centimeters or smaller and one or more of the following is found: (1) cancer has spread to the main bronchus, but has not spread to the carina; and/or (2) cancer has spread to the innermost layer of the membrane that covers the lung; and/or (3) part of the lung or the whole lung has collapsed or has developed pneumonitis. Cancer has not spread to the lymph nodes.