A Trial of GH001 in Patients With Treatment-resistant Depression

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• Main Inclusion Criteria:
• Is in the age range between 18 and 64 years (inclusive) at the time of informed consent;
• Meets the trial criteria for TRD as assessed by a study psychiatrist:
  • Meets the Diagnostic and Statistical Manual of Mental Disorders 5 (DSM-5) criteria for single-episode major depressive disorder (MDD) or recurrent MDD, without psychotic features confirmed by the Mini-International Neuropsychiatric Interview (MINI) with current episode duration of ≤2 years;
  • The current major depressive episode must be deemed "valid" based upon the Massachusetts General Hospital State versus trait Assessability Face and Ecological validity Rule of 3Ps (MGH SAFER) criteria interview;
  • Had nonresponse (≤25% improvement) to ≥2 and ≤5 oral antidepressant treatments administered during the current episode of depression.
  • Main Exclusion Criteria:
• Has, based on history, psychiatric assessment, and evaluation of the MINI during the screening period, a first MDD episode after age 60, a current or prior diagnosis of a psychotic disorder, MDD, or other mood disorder with psychotic features, bipolar disorder, obsessive compulsive disorder, posttraumatic stress disorder, autism spectrum disorder, borderline personality disorder, schizophrenia, delusional disorder, paranoid personality disorder, schizoaffective disorder, clinically significant intellectual disability, antisocial personality disorder, schizotypal personality disorder, or any other psychiatric comorbidity that renders the patient unsuitable for the trial according to a study psychiatrist;
• Has significant suicide risk;
• Has 1 or more first degree relatives with a current or prior diagnosis of bipolar disorder, psychotic disorder, or other mood disorder (including MDD) with psychotic features;
• Undergoing systematic psychotherapy that is planned to be modified or planning to initiate psychotherapy during the trial;
• Has any current or past clinically significant condition that may interfere with the interpretation of the trial results, constitute a health risk for the patient, or that otherwise renders the patient unsuitable for the trial according to the investigator's judgement;
• Fulfils criteria for DSM-5 alcohol or substance use disorder (excluding tobacco and caffeine use disorders) within the preceding 1 year, as assessed via the MINI;
• Is taking antidepressants, antipsychotics, or any medication with monoamine oxidase inhibitors activity or takes or has taken other disallowed recent or concomitant treatments or it is anticipated that the patient will require treatment with at least 1 of the disallowed concomitant treatments during the trial;
• Has previously experienced a significant adverse reaction to a hallucinogenic or psychedelic drug (e.g., psilocybin, Psilocybe spp. mushrooms, 5-MeO-DMT, DMT, ayahuasca, lysergic acid diethylamide, mescaline) according to the investigator's judgement.