Sativex Versus Placebo When Added to Existing Treatment for Central Neuropathic Pain in MS

Multiple Sclerosis Clinical Trial

Official title:

A Double Blind, Randomised, Placebo Controlled, Parallel Group Study of Sativex When Added to the Existing Treatment Regimen, in the Relief of Central Neuropathic Pain in Subjects With Multiple Sclerosis

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT00391079
• Other study ID #: GWMS0501
• Status: Completed
• Phase: Phase 3
• First received: October 20, 2006
• Last updated: June 13, 2013
• Start date: September 2006
• Est. completion date: September 2008

Study information

• Verified date: June 2013
• Source: GW Pharmaceuticals Ltd.
• Contact: n/a
• Is FDA regulated: No
• Health authority: Canada: Health CanadaUnited Kingdom: Medicines and Healthcare Products Regulatory AgencyCzech Republic: State Institute for Drug Control
• Study type: Interventional

Clinical Trial Summary

The purpose of this study is to find out if cannabis-based medicine compared to a dummy medicine (placebo that contains no active ingredient) can help the central neuropathic pain patients experience as a result of multiple sclerosis. This type of pain "central neuropathic pain" is described as shooting, stabbing, burning or searing like sensation, which is often worse at night.

Description:

GW has shown in phase II and III studies that Sativex has analgesic properties that are effective in relieving neuropathic pain. These studies suggested that Sativex is well tolerated and may also improve sleep and quality of life. GW is conducting this study to further demonstrate these effects.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 339
• Est. completion date: September 2008
• Est. primary completion date: April 2008
• Accepts healthy volunteers: No
• Gender: Both
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

• Any disease sub-type of MS of at least two years duration

• Central neuropathic pain (CNP) of at least three months and expected to remain stable for the study duration

• Moderate CNP defined by NRS pain score at baseline sum to at least 24

• Subject established on or previously tried and failed analgesic therapy for CNP

• If receiving disease modifying medications, stable dose for 3 months and maintained for study duration

Exclusion Criteria:

• Subjects whose identified pain is likely to be nociceptive, musculoskeletal (including spasms) peripheral neuropathic or psychogenic in origin, or due to trigeminal neuralgia.

• Other non central neuropathic pain of a severity which is likely to interfere with the patients assessment of CNP

• medical history suggests subject is likely to relapse/remit during course of study

• history of schizophrenia (including family history), other psychotic illness, severe personality disorder or other significant psychiatric disorder other than depression associated with MS

• known or suspected history of alcohol abuse, epilepsy or recurrent seizures or hypersensitivity to cannabinoids

• travel outside of the country of residence planned during the study

• significant cardiac, renal or hepatic impairment

• subjects with current recreational cannabis, medicinal cannabis or synthetic cannabinoid based medications within 3 months prior to study entry and unwilling to abstain for the duration of the study

Study Design

Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Investigator), Primary Purpose: Treatment

Related Conditions & MeSH terms

• Multiple Sclerosis
• Neuralgia
• Sclerosis

Intervention

Drug:
• Sativex
Containing D9 tetrahydrocannabinol (THC), 27 mg/ml: cannabidiol (CBD), 25 mg/ml, as extracts of Cannabis sativa L. Delivered in 100 µl actuations by a pump action oromucosal spray. Maximum dose within any 24-hour interval 12 sprays (THC 32.5 mg: CBD 30 mg.
• Placebo
Containing colourants and excipients. Delivered in 100 µl actuations by a pump action oromucosal spray. Maximum dose within any 24-hour interval 12 sprays.

Locations

Country	Name	City	State
Canada	Multiple Sclerosis Program, Foothills Hospital SSB	Calgary	Alberta
Canada	Dalhousie MS Research Clinic	Halifax	Nova Scotia
Canada	London Health Sciences Centre / University Hospital	London	Ontario
Canada	Montreal Neurological Institute	Montreal	Quebec
Canada	Ottawa Hospital General Campus	Ottawa	Ontario
Canada	MS Clinic, UBC Purdy Pavilion	Vancouver	British Columbia

Sponsors (1)

Lead Sponsor	Collaborator
GW Pharmaceuticals Ltd.

Country where clinical trial is conducted

Canada, 

References & Publications (1)

Langford RM, Mares J, Novotna A, Vachova M, Novakova I, Notcutt W, Ratcliffe S. A double-blind, randomized, placebo-controlled, parallel-group study of THC/CBD oromucosal spray in combination with the existing treatment regimen, in the relief of central n — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Change in Mean Pain Due to MS NRS Score	The pain NRS was completed at the same time each day, i.e. bedtime in the evening. The patient was asked "on a scale of '0 to 10', please indicate the number that best describes your pain in the last 24 hours" where 0 = no pain and 10 = pain as bad as you can imagine. No pain relates to the time prior to the onset of pain due to multiple sclerosis. A negative value indicates an improvement in pain score from baseline.	14 weeks: Baseline - End of Treatment (last 7 days of treatment)	No
Primary	Number of Patients With at Least 30% Improvement in Numerical Rating Scale (NRS) Pain Score From Baseline	A positive 30% pain response is defined as a reduction of at least 30% in the mean NRS pain score from baseline to week 14 (last 7 days). The patient was asked "on a scale of '0 to 10', please indicate the number that best describes your pain in the last 24 hours" where 0 = no pain and 10 = pain as bad as you can imagine. No pain relates to the time prior to the onset of pain due to multiple sclerosis. The pain NRS was completed at the same time each day, i.e. bedtime in the evening.	14 weeks: Baseline - end of treatment (last 7 days)	No
Secondary	Change in Pain From Baseline to End of the Treatment Using the NPS (Neuropathic Pain Scale)	The NPS score is 0-100 sum of 10 individual pain scores (0-10 NRS, 0= no pain to 10 = most pain imaginable). A negative change from baseline indicates an improvement in pain.	14 weeks: Baseline - End of treatment (Week 14)	No
Secondary	Change From Baseline to End of Treatment in Break-through Analgesia Usage	Use of break through medication was recorded daily during the 14 weeks of the study as the number of paracetamol tablets taken. The change in mean daily quantities of tablets used was calculated from baseline to the last seven days of treatment.	14 weeks: baseline - end of treatment (last 7 days)	No
Secondary	Change From Baseline to End of Treatment in BPI (Brief Pain Inventory) Short Form	The BPI-SF is a 14-item questionnaire that asks patients to rate pain over the prior week and the degree to which it interferes with activities on a 0 to 10 scale, where 0=no pain and 10=pain as bad as you can imagine. Severity is measured as worst pain, least pain, average pain, and pain right now. The severity composite score was calculated as the arithmetic mean of the four severity items(range 0-10). The minimum value is zero and maximum is 10. A higher score represents a poor outcome.	14 weeks: Baseline to end of treatment (last 7 days of treatment)	No
Secondary	Change in Subject Global Impression of Change (SGIC)	A 7-point Likert-type scale was used, with the question: 'Please assess the status of your pain due to multiple sclerosis since entry into the study using the scale below' with the markers "very much improved, much improved, slightly improved, no change, slightly worse, much worse or very much worse". At baseline subjects wrote a brief description of their pain caused by multiple sclerosis which was used at Week 14 to aid their memory regarding their symptoms at study start. For each of above markers the number of participants were reported.	Week 14	No
Secondary	Change in Sleep Disruption NRS	The sleep disruption NRS was completed at the same time each day, i.e. bedtime in the evening. The patient was asked "on a scale of '0 to 10', please indicate how your pain disrupted your sleep last night?" where 0 = did not disrupt sleep and 10 = completely disrupted (unable to sleep at all). A negative value indicates an improvement in sleep disruption score from baseline.	14 weeks; Baseline to end of treatment (last 7 days)	No