text_1: 体格检查 和 测定 血清 CA - 125 水平 的 时间 点 如下 : 每个 周期 的 化疗 开始 时 , 以及 维持 治疗 期间 每 6 个 月 1 次 .
  
text_2: physical examinations were performed and serum CA @-@ 125 levels measured at the beginning of each cycle of chemotherapy ; in maintenance , these procedures were performed every 6 weeks .
  