What this phase means
Phase 2/3: earlier tests looked promising enough to expand. This stage asks, in a larger group, whether the treatment really works and is safe enough to seek approval.
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 Psilocybin 25 mgs, Niacin 100mg, or Psychotherapy. The registry lists allocation as randomized. The purpose of this research is to study the safety and effects of single-dose psilocybin 25mg versus an active dummy treatment (placebo) (single dose niacin 100mg) in the treatment of anxiety, depression, and existential distress (i.e., loss of meaning and hope; fear of death) in advanced cancer (i.e., stage 3 or 4).
They plan to enroll about 200 people at 2 sites. Taking part typically means taking a study drug (or dummy pill), following a program (exercise, therapy, diet, or an app) plus check-ins.
Official title (unrewritten)
A Phase 2b, Randomized, Double-blind, Placebo-controlled, Multi-center Study of the Effects of Psilocybin-assisted Psychotherapy on Psychiatric and Existential Distress in Advanced Cancer
Interventions: Psilocybin 25 mgs, Niacin 100mg, Psychotherapy
Primary outcome (registry wording): Change in Structured Interview Guide for the Hamilton Anxiety Scale (HAM-A): SIGH-A Score