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Prevalence of brain metastasis according to number of risk factors (age<70, tumor size>3 cm, adenocarcinoma or large cell histology, tumor grade ≥ 2, node positive disease (N1–N3).
| Number of risk factors | Prevalence of brain metastases |
|---|---|
| 1 | 0.57% |
| 2 | 1.56% |
| 3 | 4.49% |
| 4 | 11.54% |
| 5 | 21.99% |
