Influence of Genetics on the Degradation of Cannabinoids

ISRCTN ISRCTN53019164
DOI https://doi.org/10.1186/ISRCTN53019164
Secondary identifying numbers THLD2010-1
Submission date
22/02/2010
Registration date
14/04/2010
Last edited
06/06/2025
Recruitment status
No longer recruiting
Overall study status
Completed
Condition category
Other
Prospectively registered
Protocol
Statistical analysis plan
Results
Individual participant data

Plain English summary of protocol

Not provided at time of registration

Contact information

Dr Lorenz Theiler
Scientific

University Dept of Anesthesiology and Pain Therapy
Inselspital
Bern
3010
Switzerland

Email ltheiler@med.miami.edu

Study information

Study designSingle centre open label uncontrolled interventional pharmacokinetic study
Primary study designInterventional
Secondary study designCohort study
Study setting(s)Other
Study typeOther
Participant information sheet Not available in web format, please use contact details below to request a patient information sheet
Scientific titleGenetic Influence of CYP2C9 Polymorphism on Pharmacokinetics of intravenously applied d-9-Tetrahydrocannabinol (THC) in Healthy Volunteers
Study objectivesRate of intravenous applied d-9THC depends on genetically determined CYP2C9, where two polymorphisms (SNP) are known
Ethics approval(s)Cantonal Ethics Committee of Bern approved on the 22nd of February 2010 (ref: KEK-Number 241/09)
Health condition(s) or problem(s) studiedPharmacokinetics, Forensic Medicine, Anesthesiology
Intervention300 healthy volunteers will be genetically screened for single nucleotide polymorphisms (SNP) in the Cytochrome P450 2C9 (CYP2C9) gene. The three alleles identified for this study will be
1. Wild Type (WT)
2. R144C
3. I359L

30 volunteers will be picked to form 6 groups will be based on the 6 possible allelic combinations; 11 12 13 22 23 33. Each group consists of about 5 people, although there may be some differences due to allelic frequencies. We will not study more than 30 volunteers. If more than 5 persons in a specific group are available from the screened population (that is expected for the WT), than we will randomly choose by computer randomisation.

Participants will receive a single dose of 0.1mg/kg intravenous (IV) THC. Vitals and blood THC levels will be measured continuously for 72 hours.
Intervention typeDrug
Pharmaceutical study type(s)
PhaseNot Specified
Drug / device / biological / vaccine name(s)d-9-Tetrahydrocannabinol (THC)
Primary outcome measureBlood levels of THC and degradation products, assessed by blood sampling at baseline, and 1, 2, 5, 10, 15, 20, 30, 45, 60, 90, 180, 300 Minutes and 24h, 48h after THC injection.
Secondary outcome measures1. Vitals
2. Side effects
3. Well being, assessed by questionnaires filled out at regular intervals as well by Visual Analogue Scale (VAS)
4. Pupillometry will obtained in a subgroup using standardised techniques
Overall study start date01/03/2010
Completion date01/07/2010

Eligibility

Participant type(s)Healthy volunteer
Age groupAdult
Lower age limit18 Years
Upper age limit65 Years
SexBoth
Target number of participantsScreening: 300, Inclusion in Study: 30
Key inclusion criteria1. Healthy volunteers
2. 18-65 years old
Key exclusion criteria1. Refusal to participate
2. Does not speak or read German
3. Ongoing smoking status (<3 months since quitting)
4. Extreme nutritive status (BMI outside 16-35)
5. American Society of Anesthesiologists Status Class III and above
6. Suspected coronary heart disease
7. Major heart rhythm disturbances
8. Liver enzymes P450 altering medication
9. Any treated or suspected psychiatric diseases at any time during lifetime. This includes, but is not restricted to schizophrenic disorders, depression, use of heroin, cocaine, LSD, and ongoing use of THC (<1 month since quitting).
10. Pregnant, women will be tested by urine Human Chorionic Gonadotropin (HCG)-stick
Date of first enrolment01/03/2010
Date of final enrolment01/07/2010

Locations

Countries of recruitment

  • Switzerland

Study participating centre

University Dept of Anesthesiology and Pain Therapy
Bern
3010
Switzerland

Sponsor information

Inselspital (Switzerland)
Hospital/treatment centre

c/o Prof. Robert Greif - Vice-Chair
University Dept of Anesthesiology and Pain Therapy
Inselspital
Bern
3010
Switzerland

ROR logo "ROR" https://ror.org/01q9sj412

Funders

Funder type

Hospital/treatment centre

Inselspital (Switzerland) - University Dept of Anesthesiology and Pain Therapy, Departmental Research Fund

No information available

Federal Office of Public Health (BAG) (Switzerland) (unrestricted grant)

No information available

Results and Publications

Intention to publish date
Individual participant data (IPD) Intention to shareNo
IPD sharing plan summaryNot provided at time of registration
Publication and dissemination planNot provided at time of registration
IPD sharing plan

Study outputs

Output type Details Date created Date added Peer reviewed? Patient-facing?
Results article Quantification and time course of subjective psychotropic and somatic effects 18/12/2024 19/12/2024 Yes No
Results article Effects on pupillary reaction and pupil size 13/05/2025 06/06/2025 Yes No

Editorial Notes

06/06/2025: Publication reference added.
19/12/2024: Publication reference added.