text_1: 有 ≥ 1% 肿瘤 细胞 表达 PD - L1 的 患者 被 纳入 本 试验 的 1a 部分 , PD - L1 表达 水平 < 1% 的 患者 被 纳入 1b 部分 .
  
text_2: patients who had PD @-@ L1 expression in 1 % or more of tumor cells were enrolled in Part 1a of the trial , and those with a PD @-@ L1 expression level of less than 1 % were enrolled in Part 1b .
  