Adenocarcinoma | Associated with survival | [HR: 1.73 (95 % CI 1.05, 2.85); p = 0.03] |
Smoking | Not associated with survival | [HR: 0.62 (95 % CI 0.31, 1.30); p = 0.19] |
Passive smoking | Not associated with survival | [HR: 0.56 (95 % CI 0.29, 1.08); p = 0.08] |
Brain metastasis | Not associated with survival | [HR: 1.01 (95 % CI 0.53, 1.93); p = 0.97] |