| Characteristics | N | % |
| Sex Male Female |
38 17 |
69.1 30.9 |
| Tobacco smoking Never smoker Smoker Former smoker |
6 21 28 |
10.9 38.2 50.9 |
| Pathology Non-squamous Squamous |
46 9 |
83.6 16.4 |
| Mutation status No molecular alteration Molecular alteration |
25 17 |
45.5 30.9 |
| Disease stage I, II, IIIA IIIB, IV |
7 48 |
12.7 87.3 |
| Brain metastases Synchronous Metachronous |
26 29 |
47.3 52.7 |
| Number of brain metastases at diagnosis 0 1 to 5 >5 |
29 19 7 |
52.7 34.5 12.7 |
| Brain metastases treatment Surgery or radiosurgery Whole brain radiation therapy None |
42 7 6 |
76.4 12.7 10.9 |
| Immunotherapy type Anti-PD-1 Anti-PD-L1 Anti-CTLA-4 |
47 5 3 |
85.5 9.0 5.5 |
| ECOG PS 0 - 1 ≥2 |
45 10 |
81.8 18.2 |