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From the Townsend Letter
August/September 2014

Cannabinoids: Healing Agent for Integrative Medical Cancer Treatment
by Sean Devlin, HMD, DO

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Approval Status
Approved and launched in the UK on June 21, 2010, making it the first cannabis-based prescription medicine in the world (rescheduled from UK Schedule 1 to Schedule 4 on Apr. 10, 2013). Licensed to Bayer in the UK and to Almirall in Europe. Approved to treat spasticity caused by multiple sclerosis in Spain (July 28, 2010), Canada (August 31, 2010), Czech Republic (April 15, 2011), Denmark (June 8, 2011), Germany (July 4, 2011), Sweden (December 22, 2011), Austria (February 7, 2012), Italy (May 7, 2013), and Switzerland (November 27, 2013). Also approved in Finland, Israel, Norway, and Poland.
In the US, phase III clinical trials started in late 2006 for treatment of pain in cancer patients and were in recruitment in 2013. On April 20, 2011, a US patent was granted for Sativex in cancer pain. As of April 28, 2014, Sativex was still in phase III clinical development to treat pain in cancer patients, and the company expects to see results from the program at the end of 2014. On April 28, 2014, the FDA granted "Fast Track" designation to Sativex for the treatment of pain in patients with advanced cancer. The FDA website says, "Fast track is a process designed to facilitate the development, and expedite the review of drugs to treat serious conditions and fill an unmet medical need."
GW Pharmaceuticals worked with US licensing partner Otsuka Pharmaceutical to open a Phase III Investigational New Drug application in the US to treat spasticity due to multiple sclerosis on August 14, 2013. The US phase III trial was expected to begin in the second half of 2014.

Drugs That Contain Synthetic Versions of Chemicals Naturally Found in Marijuana
Manufacturer: Unimed Pharmaceuticals, a subsidiary of Solvay Pharmaceuticals
Marinol:Source: "Cannabis, Coca, & Poppy: Nature's Addictive Plants," (accessed Nov. 12, 2013).
Cannabis-related properties:Synthetic Delta-9 THC.
Suggested medical use:Treatment of nausea and vomiting for patients in cancer treatment; appetite stimulant for AIDS patients; analgesic to ease neuropathic pain in multiple sclerosis patients.

Approval Status

FDA approved in US as Schedule I drug for appetite stimulation (1992) and for nausea (1985); moved to Schedule III effective July 2, 1999.
Approved in Denmark for multiple sclerosis (Sep. 2003).
Approved in Canada for AIDS-related anorexia (Apr. 2000) and for nausea and vomiting associated with cancer chemotherapy (1988).

Drugs That Contain Chemicals Similar to Those in Marijuana but Not Found in the Plant
Manufacturer: Valeant Pharmaceuticals International (VRX on NASDAQ)
Cannabis-related properties:Synthetic cannabinoid similar to THC.
Suggested medical use:Treatment of nausea and vomiting in patients undergoing cancer treatment.

Approval Status

Originally approved by the FDA for use in the US in 1985, but removed from the market until reapproved by the FDA on May 15, 2006, and made available in US pharmacies on August 17, 2006. Also approved in UK and Australia (1982), Canada (1981), and Mexico (2007).
On May 15, 2006, the FDA approved safety labeling revisions for nabilone (Cesamet 1-mg capsules) to advise of warnings and precautions related to its use, such as its potential to affect the mental state of a patient. On February 22, 2007, Valeant announced the submission of an Investigational New Drug application to test Cesamet as a treatment for chemotherapy-induced neuropathic pain.

Manufacturer: Solvay Pharmaceuticals (acquired by Abbott Laboratories in 2010; ABT on NASDAQ)
Cannabis-related properties:Synthetic nonpsychotropic cannabinoid that blocks NMDA receptors and COX-2 cytokines and chemokines.
Suggested medical use: Neuro­protective (protects brain from damage) for use after cardiac surgery; regain memory and other high-level function following traumatic brain injury (TBI); possible future use as an anticancer drug.

Approval Status

Not approved for use as of November 11, 2013.
The phase III clinical trial involving 846 patients was completed in December 2004; Pharmos said that the drug failed to show statistically significant improvement in the late-stage clinical trial; a phase I study to test for the treatment of brain cancer began in September 2012.

A Note on Potential Integrative Therapies
When dealing with patients with cancer or any life-threatening diagnosis, we must always work with our colleagues in traditional and conventional medicine. When treating cancer patients it is strongly advised that they all have a fellowship-trained oncologist on their medical team.
All patients need to be advised through written consent that any integrative, complementary, or alternative approaches that they chose to pursue may not be the standard of care as recognized by the AMA or the FDA. All patients should be advised of all the traditional treatments available to them and be referred to the appropriate specialists as needed and requested.
Transparency of care is extremely important when practicing integrative or functional oncology. Documentation must be detailed and should include rationale for care and reasoning for implementing integrative therapies (e.g., patient's refusal of traditional care). All health-care practitioners are encouraged work openly and collaborate with the whole care team.

Part of an Integrated Treatment Plan
Medicinal use of cannabis is not usually a stand-alone treatment plan. In my experience it can be successfully utilized as part of a comprehensive care program for any patient who may benefit from its wide range of attributes.
We are looking toward advanced clinical trials for palliative cancer care and bringing these into an integrative approach that includes both prevention and treatment. Nausea, vomiting, and appetite suppression are serious, potentially life-threatening side effects of chemotherapy. These effects can be so detrimental that patients may choose to discontinue therapy rather than face the rigors of the side effects. THC has been tested and is effective in nausea prevention, pain inhibition, and appetite stimulation.25 THC, taken as a viable, encapsulated formula or tincture, or through smoke/vapor inhalation, has tested and is effective as an analgesic, antidepressant, and sedative and for the muscle spasms that can be a debilitating symptom of multiple sclerosis.26

Pharmacology Reduction
Many of the patients whom I routinely see are on a wide range of prescription medications. These drugs have many side effects, are expensive, and often compromise wellness in a number of ways. Physicians tread a delicate path, balancing side effects, complications, and adverse drug interactions. I encourage patients to examine places where their quality of life can be improved by reducing prescription drugs. Overall, by reducing the hazards of polypharmacy, some harm reduction can be achieved.27

Potential Side Effects and Minimizing Them
Cannabinoids have an overall stable and sound drug safety profile. There are no substantiated acute fatal cases due to cannabis use in humans.28 Cannabinoids are usually well tolerated, both in treatment and study groups for humans and animals. Beyond this, cannabinoids do not produce the generalized toxic effects of most conventional chemotherapeutic agents. According to a study conducted by Manuel Guzmán, THC treatment tended to increase survival and lower the incidence of primary tumors. "Similarly, long-term epidemiological surveys, although scarce and difficult to design and interpret, usually show that neither patients under prolonged medical cannabinoid treatment nor regular cannabis smokers have marked alterations in a wide array of physiological, neurological and blood tests. The use of cannabinoids in medicine, however, is severely limited by their psychoactive effects."29
This underscores the significance of CBD based formulas, which reduce the THC and psychoactive qualities and expand potential applications for cannabinoid-based treatment options.

This is a case in which science and society are coming together to drive change. It is only a matter of time before cannabinoid pharmacology research and development will create a structured system for exacting cannabinoid dosage and delivery methods.
Expect measured, quantified dosages of pharmaceutical formulas containing marijuana chemical extractions within the decade. Both the pharmaceutical and tobacco industries have been eyeing medicinal and recreational marijuana for quite some time. As the political and social climate around marijuana evolves, we should expect to see both of these groups start to participate more in the development and manufacture of marijuana-based products. Meanwhile, there is ample opportunity to contribute to research and witness a new course of medicines being refined with testing analysis being compiled and released for public consumption.
The number of firsthand testimonials for cancer treatment resulting in remission, supporting chemotherapy and pain and symptom management is mounting. These accounts mesh with scientific data to make a powerful case for future research and clinical applications.

Steep Hill Halent Labs has conducted comprehensive research. See published reports and the 14-page document that it produced in partnership with Elemental Wellness, Understanding Medical Cannabis, at
Additional information can be found at

1.   Drug Enforcement Administration. Drug fact sheet: marijuana [online document].
2.   21 legal medical marijuana states and DC [Web page].
3.   Kuen BM.
JAMA scopes out Colorado [online article]. O'Shaughnessy's online. May 14,
4.   State marijuana laws map [Web page]. April 14, 2014.
5.   Gupta S. Weed 2. CNN. March 11, 2014. Trailer at
6.   GW Pharmaceuticals. Cannabinoids and cannabis-based medicines [Web page].
7.   Understanding medical cannabis [online document]. Elemental Wellness Center. August 2013.
8.   CBD rich medicine [Web page]. Harborside Health Center.
9.   Frisher M, White S, Varbiro G, et al. The role of cannabis and cannabinoids in diabetes.
Br J Diabetes Vasc Dis. 2010;10(6)267–273. Available at
10. Campos AC, Moreira, Gomes FV, Del Bel EA, Guimarães FS. Multiple mechanisms involved in the large-spectrum therapeutic potential of cannabidiol in psychiatric disorders.
Philos Trans R Soc Lond B Biol Sci. 2012 Dec 5;367(1607):3364–3678.
11. Maa E, Gedde M. Next generation sequencing and Dravet's syndrome [Web page].
12. Sancho R, de la Vega L, Macho A, Appendino G, Marzo VD, Muñoz E. Mechanisms of HIV-1 inhibition by the lipid mediator N-arachidonoyldopamine.
J Immunol. 2005;175:3990–3999. Available at
13. Sarfaraz S, Adhami VM, Syed DN, Afaq F, Mukhtar M. Cancer treatment: progress and promise.
Cancer Res. January 15, 2008;68;339 Philos Trans R Soc Lond B Biol Sci. 2012 Dec 5;367(1607):3364-78.. Available at
14. Simpson R.
Run from the Cure. Film. December 6, 2009. Available at
15. Boise E, Boise B. Our journey with 4 stage cancer, cannabis and alternative therapies [website]. April 2014.
16. Cohen J. Cannabidiol or CBD [Web page]. Holos Health.
17. Understanding medical cannabis. Op cit.
18. Ibid.
19. Guzmán M. Cannabinoids: potential anticancer agents.
Nat Rev Cancer. October 2003;3:745–755. Available at
20. Cannabis-based medicines–GW pharmaceuticals: high CBD, high THC, medicinal cannabis.
Drugs R D. 2003;4(5):306–309.
21. GW receives qualifying notice for approval in canada for Sativex [online press release]. October 22,
22. Huestis MA. Human cannabinoid pharmacokinetics.
Chem Biodivers. Aug 2007;4(8):1770–1804.
23. Sexton M, Ziskind J. Sampling cannabis for analytical purposes[online document]. Botec Analysis Corp. November 15, 2013.
24. 10 pharmaceutical drugs based on cannabis [Web page]. 2014.
25. Questions and answers about cannabis [Web page]. National Cancer Institute. March 25, 2014
26. Multiple Sclerosis [Web page]. NORML.
27. Woodruff K. Preventing polypharmacy in older adults.
Am Nurse Today. October 2010;5(10). Available at
28. Russo EB.
Cannabis and Cannabinoids: Pharmacology, Toxicology, and Therapeutic Potential. September 5, 2013.Available at
29. Guzmán. Op cit.

Sean DevlinSean Devlin, DO, HMD, is a board-certified family physician and board eligible in emergency medicine. Dr. Devlin is board certified and fellowship trained in anti-aging and regenerative medicine and fellowship trained in integrative cancer therapeutics. He holds a master's degree in biochemistry and has pursued doctoral studies in pharmacology with an emphasis on the evaluation of novel antineoplastic agents. Dr. Devlin has been practicing integrative oncology for the past 10 years and is a certified instructor of IPTLD and sits on the advisory board of the IPTLD foundation.

He has traveled extensively working with cancer physicians and researchers internationally in an effort to better understand cancer and its treatment. Dr. Devlin currently teaches for and works with the AAAAM Integrative Cancer Therapeutics fellowship and master's-degree program through the University of South Florida. He is a frequent speaker and guest lecturer throughout the US and currently serves on the medical advisory board for the Best Answer For Cancer Foundation.

Dr. Devlin and his team also provide onsite training services for physicians, medical staff, and front office staff, and he works with a variety of integrative-oncology and specialty medicine groups around the country as a consultant.

He has been fellowship trained in neuromuscular medicine and has spent many years working with patients suffering from chronic pain conditions. He has focused on rehabilitating patients and getting patients transitioned off of narcotics and other controlled substances.Dr. Devlin is licensed in Nevada, California, and Colorado. He is the medical director of Highland Springs Wellness Center in Grass Valley, California, and is a consultant at Sierra Integrative Medical Center, Reno, Nevada.

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