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Studies have shown that CBD oil can help relieve nausea and pain in cancer patients. So how does it work and how is it taken? Can CBD really help with cancer?
There are currently two cannabis-based pharmaceutical medicines approved for in cancer patients in the United States — Dronabinol (Marinol®) and Nabilone (Cesamet®).
A third drug — Sativex (Nabiximil®) — is approved throughout the United States, Europe, Canada, Australia, and New Zealand. It’s also sold under different names in many other countries across the globe — such as Mevatyl® in Brazil.
Each of these medications is based on the naturally produced cannabinoids made by the cannabis plant — such as THC (tetrahydrocannabinol) and CBD (cannabidiol).
Pharmaceutical science has been interested in both of these molecules as a potential new treatment for cancer patients for the past 20 years. However, only in the last 10 have we made any major strides in understanding how it actually works for this unfortunate disease.
Today, a great deal of research is taking a look at the specific effects of the non-psychoactive cannabinoid — CBD — as a potential treatment for cancer. We’ve been seeing some very positive results — but research on this interaction still has a long way to go.
Can CBD provide benefits to patients with cancer?
In this article, we’ll review the scientific literature on how CBD is being used with cancer patients, and what the current research suggests about its mechanism of action.
This is a big topic, so let’s get into it by first summing up everything we have so far.
CBD and other cannabinoids found in the hemp plant have been the focus of a lot of research in terms of cancer therapy and palliative support. Although there is still a lot of research needed to prove the effects of CBD as discussed in this article, the current findings are promising.
The most important benefits of CBD in the context of cancer treatment:
The World Health Organization (WHO) states that cancer is the second leading cause of death globally. In 2018, cancer is estimated to contribute to 9.6 million deaths worldwide .
So what exactly is cancer? Where does it come from?
Our cells are constantly multiplying themselves to replace those that are lost through damage and natural cell death. When cells are lost, new ones are formed to replace them.
However, sometimes this process breaks down and the body produces abnormal cells instead of healthy ones. Occasionally these abnormal cells become cancerous and will begin to self-replicate and spread.
What went wrong? What causes the formation of these abnormal and potentially cancerous cells?
It all starts with our DNA.
Our DNA is responsible for providing the blueprints to manufacture a new cell. The body references these blueprints every time a new cell is made. If the DNA becomes damaged, it can cause issues with the replication process — producing abnormal, or dysfunctional cells instead of healthy ones.
These dysfunctional cells can either be cancerous, or non-cancerous — however, both may start replicating themselves to produce more abnormal cells — eventually forming large “colonies” of abnormal cells known as tumors.
Non-cancerous (benign) tumors remain confined to the affected organ and their growth is generally slow. They eventually become cut off from the rest of the body as healthy cells begin to grow around the tumor in order to keep the organ functioning properly. These tumors are rarely fatal if caught early. They only become dangerous when the tumor grows so large it begins pressing on other organs — impeding their function.
Cancerous (malignant) tumors are very different. Instead of forming tumors that are cut off from the rest of the body, they integrate themselves into new areas — spreading the dysfunctional cell types to other organs and tissues. This is referred to as “metastasis”.
Cancer cells have a certain “intelligence” to them — replicating themselves relentlessly, even forming their own blood vessels to feed the energy-intensive growth of the tumor. Some cancers will even take measures to resist the effects of chemotherapy medications designed to kill them.
This type of cell dysfunction can be very dangerous — resisting attack from the immune system, and spreading to new areas of the body.
According to the National Cancer Institute, there are more than 100 different types of cancer. Each type is characterized by the organ cancer first originated in. For example, lung cancer originates in the lungs, while skin cancer starts in the skin.
Cancer can also be characterized by the type of cell that forms the tumor.
Each type of cancer is unique and may require different treatments but the general concept is the same — to stop the spread of cancer cells by interrupting their ability to replicate themselves. This is the primary goal of chemotherapy medications.
Cannabidiol (CBD) is just one out of the 400 compounds found in the cannabis plant. There are two primary therapeutic compounds contained within the leaves and flowers of the plant — THC and CBD. These compounds are closely related but have some key differences in their effects.
1. THC is the primary psychoactive component of cannabis and although it has beneficial pain-relieving and anti-inflammatory effects, it can also cause some unwanted side effects such as cognitive impairment, anxiety, sedation, dizziness, dry mouth and/or eyes, psychosis and poor motor coordination.
Pharmaceuticals like Dronabinol and Nabilone are synthetic versions of THC used as adjunctive treatments for cancer patients.
2. CBD is the primary non-psychoactive component of cannabis and has been shown to have neuroprotective, anti-inflammatory, anxiolytic and antipsychotic therapeutic actions without the typical mind-altering side effects of THC (more on this below).
Recent studies have shown that CBD exhibits anticancer activity in many types of cancer such as colorectal (colon), breast, lung, prostate, glioblastoma, melanoma, leukemia and neuroblastoma .
There’s been a lot of research in recent decades on the role of the endocannabinoid system on detecting, and eliminating cancerous cells from the body.
A lot of this research comes from the development of pharmaceutical medications based on these molecules, like Dronabinol or Sativex. The companies that manufacture these medications have deep pockets and are willing to spend hundreds of millions of dollars required to fund this type of research.
Here are some of the key findings research has uncovered over the past decades that support the use of CBD for cancer-related illness.
Most people have had cancer cells in their body at one point or another.
Normally, the immune system is able to identify the cancerous cells early and dispose of them. Specialized immune cells are tasked with performing this important job of detecting, and eliminating abnormal cells such as cancer. The most important of these immune cells are the T-Cells (T-lymphocytes) and NK cells (natural killer cells) [15, 16].
Sometimes the immune system is tricked by cancer to believe it’s not a threat — allowing it to grow out of control in the body .
Scientists believe CBD may provide anti-cancer benefits through its interaction with the CB2 endocannabinoid receptors — which have been shown to be present on T-lymphocytes, B-lymphocytes, and Natural Killer (NK) cells  but are most abundant on B-cells and NK cells .
This interaction is highly complex and researchers are still seeking to understand how CBD and other cannabinoids affect the immune system’s ability to detect and eliminate cancerous cells throughout the body. However, the current understanding, as highlighted by a Polish review paper published in 2017, is that CBD supports a shift in immune activation from being TH2 dominant (commonly found in cancer patients) to TH1 dominant (believed to resist cancer growth) [5, 24].
If you’re not sure what TH1 and TH2 immune responses are, don’t worry — it’s extremely complicated, and medical researchers who have dedicated their entire lives to the study of immune function still have a lot of unanswered questions about this particular interaction.
In basic terms, the immune system has two main sides — TH1, and TH2 — each one optimized for a different job:
Unfortunately, this system can become disoriented during cancer, and TH1/TH2 can either make cancer better or worse .
Sometimes this system needs a push in the right direction to make sure the right part of the tool is being used for the job.
One of the main side effects of cancer is pain — which can be debilitating.
Pain is often caused by the tumor pressing on nerves, bones, and organs in the body. Chemotherapy medications also cause pain as a side effect, with tingling and numbness often experienced in the fingers and toes .
This makes pain management one of the main goals for doctors treating those with cancer.
CBD is an excellent option for managing the pain experienced by cancer patients because it works through more than one mechanisms to achieve this effect.
In a recent study, an extract containing both CBD and THC was shown to relieve pain in patients with advanced cancer where opioids were ineffective .
Chronic pain associated with cancer, along with other side effects like anxiety and depression can make it difficult for patients to fall asleep and stay asleep.
CBD may help by reducing symptoms like pain and anxiety that can interfere with sleep.
A recent review article highlighting the years of phase I, II, and III clinical trials conducted with the cannabinoid-based pharmaceutical preparation, Sativex, showed significant improvements in sleep quality and duration among cancer patients as well as other chronic and life-threatening health conditions . This review included information gathered from 2000 different patients and roughly 1000 patient-years of exposure to the medication.
One of the main side effects of cancer treatment is a reduced appetite.
A healthy appetite is vitally important to supply the body with the nutrients it needs to promote recovery.
If we’re not eating enough, it makes it even more difficult for the body to fight cancer, so ensuring we eat enough food is of the utmost importance.
CBD isn’t known for its ability to increase appetite. This effect is mainly attributed to the THC content of marijuana instead. A phase II clinical trial published in 1994 showed that 13 out of 19 cancer patients experiencing severe weight loss and appetite suppression had significantly increased appetite and weight gain after taking THC .
Although not legal in many states, THC has actually been shown to offer significant improvements in appetite . So if you can get access to CBD oil with THC, this is likely to offer the most benefit on this effect.
The main goal of cancer treatment is to stop tumors from growing and to give the body the best chance of fighting back.
CBD oil has been shown to inhibit tumor cell growth and helps to stop it from spreading to other areas of the body.
In some patients, the use of CBD has led to decreased tumor cell growth rate and invasion . Most of the research in this domain involves animal studies and are in need of long-term clinical trials involving humans to be confirmed.
However, there has been plenty of research showing a reduction in tumors through animal and in vitro research — such as this on pancreatic cancer , brain cancer , and colon cancer , to name a few.
There are a few suggested theories as to how CBD is able to reduce tumor size in cancerous tumors — such as through anti-inflammatory, antioxidant and immunomodulatory effects, as well as induced-apoptosis (programmed cell death) — however, this depends highly on the form of cancer being treated along with a host of other factors.
Nausea and vomiting are both common side effects of chemotherapy. Treating these symptoms will offer a significant improvement in cancer patients’ overall quality of life.
Cannabis has been used for centuries to relieve both nausea and vomiting. There is both anecdotal and research-based evidence supporting the use of CBD for therapeutic improvement in chemotherapy-induced nausea and vomiting .
The largest of these studies was a Cochrane review that analyzed the results of 23 clinical trials involving cannabinoids — which concluded that cannabinoids were highly effective and providing similar results to conventional treatments for alleviating chemotherapy-induced nausea and vomiting .
It’s worth noting that some studies found the opposite effect . So it’s worth giving CBD a try before relying on it to alleviate nausea and vomiting. This can be very different from one person to the next.
A cancer diagnosis can be extremely stressful, and many people suffer from depression and anxiety during and after treatment (anywhere from 0%–58% depending on the study and stage/type of cancer) .
Reducing anxiety and depression are considered one of the most important treatment steps for supporting cancer recovery and improving the quality of life of those affected.
CBD has well-known benefits for reducing symptoms of depression and anxiety — which has been studied thoroughly through animal testing . Several clinical trials are currently underway to investigate the specific effect of using CBD on humans suffering from various forms of depression.
More research is needed to prove these effects in humans.
When this is combined with lifestyle changes, supportive friends and family, and a lot of personal contemplation, it can be an extremely powerful tool in alleviating depression, anxiety, and overall health and wellbeing.
This article is intended for informational use only — always speak with your doctor before using CBD or any other supplement.
There are a lot of people these days using supplements like CBD to support their immune system, and address some of the most common side-effects of cancer and chemotherapy.
Side effects patients may experience range from weight loss, fatigue, peripheral neuropathy, mouth ulcers, blisters, and hair loss.
Widespread research has shown CBD to have a high level of safety — even in combination with other pharmaceutical medications .
The most common method of taking CBD oil is oral. This allows an easily administered form of the supplement, allows users to measure dosages accurately, and has a relatively high absorption rate compared to other methods.
CBD can also be taken in capsule form, used topically (such as with skin cancer), disguised in beverages, or baked into food.
Most of the research on using CBD and other cannabinoids with other cancer therapies involved higher doses than other health conditions. Speak with your doctor about the right dose, and remain consistent with the dosage regimen for best results.
Research involving CBD has shown a lot of promise as an adjunctive treatment with cancer patients — however, more research is needed to prove these effects in practice.
The majority of the research on this application involves in vitro research animal testing, and small group human research trials.
The benefit of this useful health supplement lies in its ability to interact with the endocannabinoid system — which is deeply connected with the inflammatory response, and other aspects of the immune system including the balance between TH1 and TH2 responses.
CBD may also provide benefit to some of the common side-effects of chemotherapy and cancer such as nausea, vomiting, pain, insomnia, anxiety, and depression.
With its long list of therapeutic benefits and a widespread lack of substantial risk or side effects, CBD is an exciting new prospect for cancer treatment. We’ll be sure to share any developments in this area as they’re published in the scientific literature.