Controls | Screened | |
Cancers | 36 | 42 |
Small cell | 5 (14) | 10 (24) |
Adenocarcinoma | 8 (22) | 11 (26) |
Squamous | 9 (25) | 14 (33) |
Large cell | 0 | 1 (2) |
Other histology | 9 (25) | 5 (12) |
Unknown | 5 (14)# | 1 (2) |
Nonsmall cell lung cancer | 27¶ | 32¶ |
Stage I | 11 | 16 |
Stage II | 2 | 3 |
Stage III | 6 | 4 |
Stage IV | 7 | 9 |
Unknown | 1 | |
Small cell lung cancer | 5 | 10 |
Limited disease | 1 | 4 |
Extensive disease | 4 | 6 |
Data are presented as n or n (%). The exit chest radiography found five cancers in the screened group (these had no sputum samples or their sputum tests were normal throughout the trial: cancer stage was I (n=2), II (n=1), IV (n=1) and limited disease (n=1)) and six cancers in the control group (stage was I (n=3), III (n=1), IV (n=1) and missing (n=1)). #: diagnosed at nontrial sites (unknown or not set up for the trial so no access to medical records; these cancers were notified through registries and we found staging for one of the five cases); ¶: includes one patient in each trial group where histology was unknown but stage was available.