noun
phase III study; phase III trial
Medical term for a large-scale clinical trial that assesses efficacy and safety before regulatory approval.
新薬の第三相試験が来月から始まる。
The phase III trial of the new drug will start next month.
Standard kanji spelling using Chinese numeral.
Variant with Arabic numeral; common in technical documents.
Clinical trial in general; 第三相試験 is a specific stage within a clinical trial.
Compound of 第三 (third) + 相 (phase) + 試験 (test/trial), calque from English 'phase III trial'.