Table 1.
Patient Demographic and Clinical Characteristics
| Characteristic | No. (%) |
|---|---|
| Median follow-up, months | |
| From date of lung cancer diagnosis | 38.1 |
| From date of brain metastasis diagnosis | 16.0 |
| Age, years | |
| < 60 | 72 (80) |
| ≥ 60 | 18 (20) |
| Sex | |
| Male | 48 (53) |
| Female | 42 (47) |
| Smoking history, pack-years | |
| Never-smoker | 60 (67) |
| ≤ 10 | 18 (20) |
| < 10 | 12 (13) |
| Stage at diagnosis | |
| I | 3 (3) |
| II | 3 (3) |
| IIIA | 11 (12) |
| IIIB | 6 (7) |
| IV | 67 (74) |
| Brain metastasis at time of diagnosis | |
| No | 63 (70) |
| Yes | 27 (30) |
| First brain imaging | |
| CT | 2 (2) |
| MRI | 73 (81) |
| Both | 15 (17) |
| No. of brain metastases at first imaging | |
| 1 | 23 (26) |
| 2 | 15 (17) |
| 3 | 10 (11) |
| ≥ 4 | 42 (47) |
| Extracranial metastasis present | |
| Yes | 62 (69) |
| No | 27 (30) |
| Unknown | 1 (1) |
Abbreviations: CT, computed tomography; MRI, magnetic resonance imaging.