Evidence-Based Oncology
October 2018
Volume 24
Issue 11

Medical Marijuana in Cancer Treatment: No Standards of Care, and So Far, No Coverage

Over the past decade, both recreational and medical marijuana use in the United States has grown tremendously. However, disputes surrounding the legal and ethical implications, safe administration, dispensing, health consequences, and therapeutic indications– albeit based on very limited clinical data– related to its usage abound.

Over the past decade, both recreational and medical marijuana use in the United States has grown tremendously.1 However, disputes surrounding the legal and ethical implications, safe administration, dispensing, health consequences, and therapeutic indications— albeit based on very limited clinical data– related to its usage abound.

Medical marijuana has gained traction specifically in patients with cancer to treat a variety of adverse effects associated with treatment, such as pain, nausea, and lack of appetite. However, major cancer organizations do not have any standards for marijuana use. With no guidelines, payers have yet to cover it as a treatment, citing this lack of acceptance, insufficient clinical data, and the lack of an FDA-approved product for cancer adverse effects that contains a marijuana-based ingredient.

According to the World Health Organization (WHO), cannabis is the most commonly cultivated, trafficked, and abused illicit drug worldwide, with annual consumption by nearly 147 million people, or 2.5% of the world’s population as of 2016. In comparison, 0.2% of the world’s population consumes opiates on a yearly basis.2

The legal status of marijuana has become increasingly complex. At the federal level, marijuana remains illegal. It is classified as a schedule 1 drug, defined as “drugs, substances, or chemicals with no currently accepted medical use and a high potential for abuse.”3 Other drugs in this class include heroin, lysergic acid diethylamide (LSD), methylenedioxymethamphetamine (ecstasy), methaqualone, and peyote.

Despite this, many states have taken matters into their own hands (Figure). To date, marijuana is legal for medical use in 22 states and for both medical and recreational use in 9 states and the District of Columbia. It remains illegal in Idaho, South Dakota, Nebraska, and Kansas. The remaining 15 states have some level of medicinal marijuana legalized, though it is only available as a “low THC, high CBD oil.”4 Scientists have identified many cannabinoids, the biologically active components in marijuana; the 2 most studied are delta-9-tetrahydrocannabinol (THC) and cannabidiol (CBD).

In New Jersey, where medical marijuana is legal and the legislature is weighing recreational use, neurologist Andrew Medvedovsky, MD, began recommending cannabis in 2015, after completing an interventional pain fellowship. Prescribers need a special registration, so Medvedovsky often receives referrals from other physicians, including oncologists, when patients want to try cannabis to relieve pain and other symptoms. “My position is that [it] is extremely safe and effective for multiple ailments, and ideal for patients who are on polypharmacy that can have risky drug interactions, potential for addiction, or [for] patients on medication doses that I don’t feel comfortable with,” he said. Some patients already test positive for THC, “and we start this conversation.”

“My goal for every patient is to reduce the need for such a load of medications, get them back to functional status, decrease side effects and [put them] at less risk of addiction,” Medvedovsky said. “I find medical marijuana to be a great substitute for such patients, because we can manage severe pain, muscle spasms, sleep, anxiety, depression, and reduce the burden of pills and improve function.”

Understanding Marijuana's Mechanisms

Marijuana primarily affects parts of the brain and the spinal cord by binding to 2 types of G-protein coupled receptors, CB1 and CB2. By acting on the CB1 receptor in the brain, marijuana overactivates the endo cannabinoid system within the body, alters the user’s perceptions and mood, disturbs memory function and learning, and impairs judgement.5

The CB2 receptors, primarily found in peripheral tissues on cells in the immune system, hematopoietic systems, and the spleen may play a role in the immune-suppressive activity of cannabis.6 Some research has even suggested that it may contain anticancer properties. In mouse models, cannabinoid administration was observed to reduce the expression of vascular endothelial growth factor and its receptors, leading to inhibition of angiogenesis. In another study involving mice, adding THC to temozolomide reinstated glioma suppression in tumors that had become resistant to chemotherapy. Cannabinoids also have anti-inflammatory and antioxidant properties that are beneficial in combatting cancer specifically,6 although these studies were performed in laboratories with animal models rather than in human models.

The effects an individual feels from marijuana also depend on how the compounds enter the body. When taken by mouth, such as in baked goods, THC can take hours to be fully absorbed. Once that occurs, marijuana is processed by the liver, which produces a second psychoactive compound, CBD, that acts on the brain and changes mood or consciousness. When marijuana is smoked or vaporized, THC enters the bloodstream and reaches the brain very quickly. The second psychoactive compound, CBD, is produced in small amounts, with fewer effects.7 Medvedovsky discourages smoking because of the possibility of toxins and encourages vaping instead, although he finds that most patients still inhale by smoking.

Despite Need for Use in Cancer, Gaps in Research

In the United States, an estimated 1,735,350 people will be diagnosed with cancer this year.8 Although nearly every state that has laws surrounding medical marijuana identifies cancer as a qualifying condition, little research has been conducted to support its use in oncology. In a study published in the Journal of Clinical Oncology in July 20189, researchers hypothesized that the discrepancy between medical marijuana laws and scientific evidence posed a clinical challenge for oncologists. The study authors mailed a survey to 400 medical oncologists across the nation that included questions surrounding whether physicians reported discussing medical marijuana with patients, recommended it clinically within the past year, or felt sufficiently informed to make such recommendations.

Researchers found that while only 30% of oncologists felt sufficiently informed to make recommendations regarding medical marijuana, nearly 80% conducted discussions about the treatment and 46% recommended it clinically. These findings shed light on critical gaps in research, medical education, and policies regarding medical marijuana.

Despite the treatment becoming increasingly popular among patients with cancer, most major cancer societies have declined to take positions on its use. When Evidence-Based OncologyTM (EBO) reached out to cancer organizations, here’s what each had to say:

American Society of Clinical Oncology: “ASCO does not have an official position on the use of cannabis for pain management.”

National Comprehensive Cancer Network: “The NCCN Adult Cancer Pain Panel has made no recommendation either for or against cannabis for pain management in cancer patients.”

National Cancer Institute: “NCI does not take positions or make recommendations about this or other treatments but rather, as the federal government’s principal agency for cancer research and training, provides scientific-based information for patients and healthcare providers.”

Oncology Nursing Society: “ONS does not have a position statement related to medical cannabis.”

American College of Obstetricians and Gynecologists: “ACOG doesn’t have any specific guidance about cannabis use as a pain management tool for gynecologic cancers.”

By contrast, the American Cancer Society stated that it supports the need for more scientific research around the treatments.

Absent Guidelines, Payers Stay on Sidelines

Some cancer groups provide guidelines10 about how to administer the treatment to patients, but none has taken a stand to say it explicitly approves of or disapproves of the treatment. This can lead to confusion not only for patients and their oncologists, but for payers as well.

When EBO reached out to several major insurers about coverage for medical marijuana for pain management specifically in cancer, their answers were much of the same. A representative from Humana noted in an email to EBO, “As of right now, there is no FDA-approved marijuana product, and we therefore do not currently offer a prescription drug benefit for medical marijuana. If there were to be an FDA-approved medical marijuana product in the future, it may be covered depending upon the terms of the individual member’s drug coverage.” A representative from UnitedHealthCare echoed this, stating, “We do not cover medical marijuana at this time as it is not approved by the FDA.”

However, in June 2018, the FDA approved Epidiolex (cannabidiol) oral solution for the treatment of seizures associated with 2 rare and severe forms of epilepsy. It was the first FDA-approved drug that contained a purified drug substance derived from marijuana.11 Previously, the FDA had approved dronabinol (Marinol), a gelatin capsule containing a synthetic version of THC to treat nausea and vomiting associated with chemotherapy as well as weight loss and poor appetite in patients with AIDS, and nabilone (Cesamet), a synthetic cannabinoid that acts like THC to treat nausea and vomiting caused by chemotherapy.12

“We know that THC helps patients with nausea and appetite, which is why cancer patients receive the FDA-approved drug Marinol,” Medvedovsky noted. “In my experience and from the cancer patients I have treated with cannabis, there was no negative effect of medical marijuana on their cancer treatment. It is usually the opposite—so many patients suffer with nausea, poor appetite, pain, depression, insomnia— and the medications they are prescribed are challenging to tolerate because of the nausea,” he said.

“Cannabis allows patients to medicate naturally and find almost immediate relief of nausea symptoms during or after chemotherapy, improve appetite, sleep, mood, energy, and pain control naturally.” He noted the emerging evidence of anti-cancer properties as well.

Many questions remain unanswered for medical marijuana in terms of insurance coverage, such as:

  • Which conditions would be covered? Do health plans see a difference between covering medical marijuana to treat terminal cancer and covering it to treat chronic back pain?
  • Will coverage extend to patients in taxpayer-funded programs, such as Medicare or Medicaid?
  • Will state-level plans, such as the Blues, cover it?

In a recent case in New Jersey, McNeary v. Township of Freehold, a worker’s compensation judge ruled for at least the second time in the state that an injured worker was entitled to coverage for medical marijuana.13 Steven McNeary, a patient with muscular spasticity, sought a court order to require the insurance carrier for Freehold Township to pay for his medical marijuana treatment. The insurer refused, arguing that the Controlled Substances Act’s (CSA) criminalization of marijuana supersedes state-level laws. New Jersey Workers’ Compensation Judge Lionel Simon disagreed, ruling that New Jersey’s medical marijuana statute is not pre-empted by federal law. In his decision, Simon stated that the CSA and the New Jersey Medical Marijuana Act both seek to deter the distribution and use of illicit drugs.

“I honestly don’t feel in my heart of hearts that this is a conflict. Certainly, I don’t understand how a carrier, who will never possess, never distribute, never intend to distribute these products, who will [merely] sign a check into an attorney’s trust account, is in any way complicit with the distribution of illicit narcotics,” Simon said.

He cited concerns that McNeary could instead become addicted to opioids should he not be able to obtain medical marijuana. He explained that the court is aware of the “explosion” of narcotics in the United States and the related deaths and addiction rates that follow. “I believe, and I think science supports this, that medical marijuana is safer, it’s less addictive, it is better for the treatment of pain,” he said.

However, the Maine Supreme Court reversed a lower court ruling to compel an insurer to pay for medical marijuana, citing the conflict with federal law.14

Evolving Law and Patient Access

The landscape and conversation around marijuana and its potential use for a multitude of treatments in many disease states is evolving in the United States. In 2018, more states have laws on the books that allow patients access to marijuana in some form than those that do not. While the future of such products remains uncertain, the FDA and the WHO have taken steps to further increase patient access.

WHO recently launched a review of the current international classification of marijuana, THC, CBD, and other related compounds and requested input from member nations.15 The FDA has also requested that the public submit comments that can inform the country’s position before provides its opinion to the WHO.16 This public comment period has since closed. While the findings of the WHO’s review were not released at the time of publication, the potential reclassification of marijuana could have implica- tions both at the state and federal levels.

In addition, a panel in the US House of Representa- tives that reviews federal drug enforcement approved a bill on September 13 that will require the Department of Justice and Attorney General Jeff Sessions

to begin issuing more licenses to grow marijuana for research. To date, 1 farm at the University of Mississippi can supply cannabis for research purposes.17 This bill would increase the number of locations able to legally cultivate marijuana for research purposes to 3.

Prior to the vote, a debate broke out regarding a provision of the legislation that prevents anyone with a “conviction for a felony or drug-related misdemeanor”18 from being affiliated with any kind of cannabis research cultivation. While legislation supporters sought to amend the bill to remove this distinction, House Judiciary Chairman Bob Goodlatte (R-VA) shot down a compromise that would have done away with the restrictions on people with drug misdemeanors while maintaining the ban on those with felony convictions. Instead, he made a commitment to work to revise the restrictions before the bill goes to the House floor and indicated that he would “probably not object” to a carve-out designation for individuals with drug possession convictions.

“While there are many varying opinions on the issue of marijuana, one thing we can all agree on is that we need qualified researchers to study the science to determine if there are any potential medicinal benefits to chemicals derived from cannabis,” said Goodlatte in a statement.19

Without insurance, cost considerations keep patients from using vapes, which Medvedovsky said are safer than smoking. Vapes cost $200 to $400, and a typical medical marijuana program will cost $300 to $400 to join and $150 to $200 per month after that for product.

More patients are asking for medical marijuana as the stigma around it has waned, Medvedovsky said. “By the time I see them, most patients are excited and ready to start. Many people are desperate for relief and will do anything to feel better, especially when dealing with the end of life.”REFERENCES

  1. Mauro P, Carliner H, Brown Q, et al. Age differences in daily and nondaily cannabis use in the United States, 2002-2014. J Stud Alcohol Drugs. 2018;79(3):423-431. doi: 10.15288/jsad.2018.79.423.
  2. World Health Organization. Management of substance abuse: cannabis. Published 2016. Accessed August 28, 2018.
  3. United States Drug Enforcement Administration. Drug scheduling. DEA website. Accessed September 14, 2018.
  4. Governing. State marijuana laws in 2018. Governing website. governing. com/gov-data/safety-justice/state-marijuana-laws-map-medical-recreational.html. Published March 30, 2018. Accessed September 14, 2018.
  5. Oberbarnscheidt T, Miller N. Pharmacology of marijuana. J Addict Res Ther. 2016;S11:012. Accessed September 8, 2018.
  6. Abrams D. Integrating cannabis into clinical cancer care. Curr Oncol. 2016;23(2):S8-S14. doi: 10.3747/co.23.3099.
  7. ACS. Marijuana and cancer. ACS website. marijuana-and-cancer.html. Published March 4, 2015. Updated March 16, 2017. Accessed September 14, 2018.
  8. NCI Cancer Statistics. NCI website. Updated April 27, 2018. Accessed September 14, 2018.
  9. Braun I, Wright A, Peteet J, et al. Medical oncologists’ beliefs, practices, and knowledge regarding marijuana used therapeutically: a nationally representative survey study [published online July 25, 2018]. J Clin Oncol.
  10. Paice JA, Portenoy R, Lacchetti C, et al. Management of chronic pain in survivors of adult cancers: American Society of Clinical Oncology clinical practice guideline. J Clin Oncol. 2016:34(27):3325-3345. doi: 10.1200/ JCO.2016.68.5206.
  11. FDA approves first drug comprised of an active ingredient derived from marijuana to treat rare, severe forms of epilepsy [press release]. Silver Spring, MD: FDA; June 25, 2018. PressAnnouncements/ucm611046.htm?
  12. FDA. FDA and marijuana. FDA website. PublicHealthFocus/ucm421163.htm. Updated June 25, 2018. Accessed September 15, 2018.
  13. Mckillop D. NJ workers’ compensation judge rules claimant entitled to insurance coverage for medical marijuana. Scarinci Hollenbeck website. Published August 1, 2018. Accessed September 8, 2018.
  14. Gaetan H. Bourgoin v. Twin Rivers Paper Company, LLC, et al, 2018 ME 77, A3d
  15. Angell T. Feds want input on marijuana reclassification. Forbes. April 6, 2018. Accessed September 18, 2018.
  16. Office of the Federal Register. International drug scheduling; single convention on narcotic drugs; cannabis plant and resin; extracts and tinc- tures of cannabis; delta-9-tetrahydrocannabinol; stereoisomers of tetra- hydrocannabinol; cannabidiol, request for comments. Federal Register.April 9, 2018. international-drug-scheduling-convention-on-psychotropic-substances-single-convention-on-narcotic. Accessed September 18, 2018.
  17. Vote in Congress could open up US cannabis research. The Pharma Letter website. open-up-us-cannabis-research. Published September 11, 2018. Accessed September 13, 2018.
  18. Angell T. Marijuana bill approved by Congressional committee, despite rug conviction restriction dispute. Forbes. September 13, 2018. forbes. com/sites/tomangell/2018/09/13/marijuana-bill-approved-by-con- gressional-committee-despite-drug-conviction-restriction-dispute/#3b9176733482. Accessed September 15, 2018.
  19. Judiciary Committee approves bipartisan bill to improve medical marijuana research [press release]. Washington, DC: House of Representatives; September 13, 2018. tee-approves-bipartisan-bill-to-improve-medical-marijuana-research/. Accessed September 15, 2018.
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