Pfizer應該是把二期跟三期一起做

phase II/III clinical trial

原文
"Phase II/III clinical trials may also provide more information about the safety and side effects of the new treatment. Combining phases II and III may allow research questions to be answered more quickly or with fewer patients. Also called phase 2/phase 3 clinical trial."

Google翻譯
"II/III 期臨床試驗也可能提供有關新療法的安全性和副作用的更多信息。 將 II 期和 III 期相結合，可以更快地或用更少的患者回答研究問題。 也稱為 2 期/3 期臨床試驗"