During their lifetime, one in eight Canadian men will be diagnosed with prostate cancer
Canada’s most well-established and reliable producer of medical cannabis, along with researchers at McGill University Health Centre and Dalhousie Universities, officially started patient engagement on June 23, 2015 on the CAPRI Trial (Cannabinoid Profile Investigation of Vaporized Cannabis in Patients with Osteoarthritis of the Knee), a randomized, double blind, placebo controlled, proof-of-concept, crossover clinical trial of single dose vaporized cannabis in adults with painful osteoarthritis of the knee.
Not only was this clinical trial the first to be registered with Health Canada after the transition to the new Marihuana for Medical Purposes Regulations (MMPR), CAPRI will seek to understand the analgesic dose-response of several varieties of medical cannabis, consisting of varying concentrations of the two most common active ingredients: delta-9-tetrahydrocannabinol (THC) and cannabidiol (CBD). It will also explore the short-term safety of vaporized cannabis as well as look at functional changes and patient preference.
“Anecdotal evidence supporting cannabis as a medicine is increasing, however this isn’t quite good enough for our patients,” said Brent Zettl, President and CEO of Prairie Plant Systems Inc. and CanniMed Ltd. “In order for medical cannabis to become a true medicine, it requires carefully conducted trials to provide hard data. It is our ongoing mission to support patients and their prescribing physicians with more research into the safety and efficacy of these cannabis based products to ensure predictable and standardized treatment options in the near future.”
The CAPRI Trial will be recruiting 40 patients suffering from serious osteoarthritis of the knee over the two trial sites in Montreal, QC and Halifax, NS. Patient recruitment starts today at the McGill University Health Centre, and Dalhousie University will begin to recruit patients shortly.
“This clinical trial significantly advances medical cannabis research in Canada,” said Dr. Mark Ware, CAPRI trial primary investigator and practicing pain physician at the McGill University Health Centre, and Executive Director of the Canadian Consortium for the Investigation of Cannabinoids (CCIC). “This research will help to start answering important questions physicians have regarding dosing as well as short term safety and efficacy related to specific ratios of cannabinoids.”
The body’s own pain-regulating system, called the endocannabinoid system, has receptors in nervous system tissue, immune cells, bone and joint tissue. These receptors respond to the cannabinoids found in medical cannabis, similar to how a key opens a lock. Research has demonstrated the short term efficacy of medical cannabis at reducing pain when used by itself or in combination with other pain-relievers, but comparisons between cannabinoid ratios have not been tested in clinical settings.
For the 4.6 million Canadians with arthritis, currently available medications are often inadequate or associated with unacceptable side effects. Research into new treatment options, including the potential therapeutic benefit of medical cannabis, is an important next step in determining options available to patients and their caregivers.
“We are very pleased to see that the CAPRI clinical trial is underway and beginning recruitment,” said Joanne Simons, chief mission officer, The Arthritis Society. “We know that many people living with arthritis seek alternative options for pain relief, including medical cannabis. Well-designed clinical research is a pre-requisite to get us to where we want to go: more treatment options available to help people manage the pain of arthritis.”