text_1: 纳武利 尤 单抗 + 化疗 组和 单独 化疗 组 的 中位 总 生存期 分别 为 15.2 个 月 ( 95% CI , 12.3 ~ 19.8 ) 和 12.2 个 月 ( 95% CI , 9.2 ~ 14.3 ) .
  
text_2: the median duration of overall survival was 15.2 months ( 95 % CI , 12.3 to 19.8 ) with nivolumab plus chemotherapy and 12.2 months ( 95 % CI , 9.2 to 14.3 ) with chemotherapy alone .
  