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| Project | Subjects | Method | Number of cases |
|---|---|---|---|
| First | Surgical cases in 1989 | Retrospective | 3,643 |
| Second | Surgical cases in 1994 | Retrospective | 7,408 |
| Third | All cases in 2002 | Prospective | 14,925 |
| Fourth | Surgical cases in 1999 | Retrospective | 13,310 |
| Fifth | Surgical cases in 2004 | Retrospective | 11,663 |
| Total | – | – | 50,949 |
JJCLCR, Japanese Joint Committee of Lung Cancer Registry.
