What this phase means
Phase 3: this treatment already looked useful in smaller studies. Now it is tested in a large group, often against standard care or a dummy treatment, to see if it should be approved.
Phase labels are FDA/ICH categories applied to the registry Phase field. They are not a finding that this study succeeded.
What the registry says happens
If you join, the listed intervention(s) are Placebo, or DT120. The registry lists allocation as randomized. A Phase 3 neither you nor the study doctors know who gets the real treatment, compared with a dummy treatment Study (Part A) with an Open-label Extension (Part B) Evaluating DT120 Compared to dummy treatment (placebo) in Major Depressive Disorder - Ascend
They plan to enroll about 165 people at 26 sites. Taking part typically means taking a study drug (or dummy pill) plus check-ins.
Official title (unrewritten)
A Phase 3 Multicenter, Randomized, Double-blind, Placebo-controlled, 12-Week Study (Part A) With a 40-Week Open-label Extension (Part B) Evaluating the Efficacy and Safety of Oral DT120 Compared to Placebo in the Treatment of Adults With Major Depressive Disorder - Ascend
Interventions: Placebo, DT120
Primary outcome (registry wording): Change from Baseline in the Montgomery-Åsberg Depression Rating Scale (MADRS) total score at Week 6