a positive trendp = 0.06
The subgroup analysis suggested that the combination therapy not only provided significant improvement in PFS (HR = 0.60, 95% CI 0.39–0.90; p = 0.01), but also had a positive trend to prolong OS (HR = 0.69, 95% CI: 0.46–1.02; p = 0.06) in patients with brain metastasis (Fig. 4 A, B).