NIDA Phenotyping Assessments Battery (PhAB) Feasibility and Validation Study in Non-Intoxicated Drug Users

There is profound heterogeneity of subjects in clinical studies of addictions, with patients being diagnosed by the primary substance of use. As a result, utilizing current DSM addictions classification leads to problems with signal detection and hamper the progress of the development of new drugs and treatments for substance use disorders (SUDs). Getting beyond the DSM-5 based definitions is necessary to "fingerprint" addiction phenotypes and endophenotypes, using machine-learning analyses of big data. A detailed in-depth assessment of addiction phenotypes (deep phenotyping) may also include neuroimaging.

In an effort to develop a "fingerprint" for addiction phenotypes, NIDA established a Workgroup to develop a phenotyping battery of tests and self-rated psychometric scales, supplemented by resting state fMRI to be administered to participants in any extramural clinical trial where addictions are assessed. The final phenotyping battery content was determined via consensus from both the selected experts- consultants group and the NIDA workgroup, and as such, the battery requires feasibility and validation study to finalize its content. The NIDA Phenotyping Assessment Battery (PhAB) covers six neurofunctional addiction domains: Metacognition, Interoception, Cognition/Executive Function, Reward/Incentive Salience, Emotion/Negative Emotionality, and Sleep/Circadian Rhythm. The PhAB is meant to be administered during a Phenotyping visit - an extension of a screening visit in any clinical trial addictions protocol. In addition to the PhAB, the group also developed an ancillary set of measures to be administered in conjunction with the PhAB in any addictions clinical trial during the Phenotyping visit. The Platform Instruments include structured interviews, diagnostic measures (e.g., MINI), self report scales of symptom severity (e.g., ASRS-ADHD, VAS-Pain), trauma history (CTQ), computer-administered measures of intelligence (e.g., Shipley), and substance use measures (FTND, Timeline Follow-back), etc. Clinical trial investigators would administer these scales and behavioral tasks in addition to protocol nonspecific assessments (e.g., demographics) and medical evaluations (e.g, medical history and physical exams, genotyping, and labs) which could be done at Screening.

This study is a feasibility, construct and face validity study. The primary outcome measure is time taken to complete the battery, and rates of successful study completion