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    • Woman's tumour shrank after taking CBD oil daily for more than two years: case study

    In this Nov. 6, 2017, file photo, a syringe loaded with a dose of CBD oil is shown in a research laboratory at Colorado State University in Fort Collins, Colo. (AP Photo/David Zalubowski, File) In this Nov. 6, 2017, file photo, a syringe loaded with a dose of CBD oil is shown in a research laboratory at Colorado State University in Fort Collins, Colo. (AP Photo/David Zalubowski, File)
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    TORONTO -

    A case study of a U.K. woman whose lung tumour shrunk without the aid of conventional treatments while she was taking a daily dose of cannabidiol (CBD) oil has scientists suggesting it may be worth studying the use of CBD oil further.

    The report,, describes how the woman鈥檚 tumour shrunk from 41 mm to 10 mm in roughly two and a half years.

    Cannabinoids are similar to endocannabinoids, which are manufactured by the human body to help in various processes, such as nerve function, energy metabolism, pain and inflammation and immune function, among others.

    While cannabinoids have been studied as a primary cancer treatment before, the results have been inconclusive and inconsistent, making it difficult to pinpoint if it actually had any impact.

    In this case report, a woman in her 80s was diagnosed with 鈥渘on-small cell鈥 lung cancer in June 2018 after months of a suspicious cough. She was a life-long smoker, smoking roughly 68 packs a year, and had a background of 鈥渕ild chronic obstructive pulmonary disease,鈥 the report stated.

    When she was first diagnosed, even though she was a candidate for treatments aimed at curing her cancer, she declined surgery, radiotherapy and other treatments she was offered.

    The report offered the patients鈥 perspective, in which she explained that she declined treatment because she had watched her late husband go through the struggle of radiotherapy.

    So doctors decided to simply perform regular CT scans to check up on the patient every three to six months.

    During these scans over the next couple years, doctors observed that her lung cancer was shrinking. By February 2021, it had reduced by approximately 76 per cent in diameter, which averaged to a 2.4 per cent reduction per month since diagnosis.

    In 2019, the shrinking of the tumour piqued doctors鈥 interests, and the patient was brought in to discuss her results.

    In this meeting, she revealed that she had been taking CBD oil 鈥渁s an alternative self-treatment for her lung cancer鈥 since August 2018, which she had sourced from outside of the U.K. She was taking 0.5 ml of the CBD oil, two-three times per day.

    鈥淭he supplier advised that the main active ingredients of the 鈥楥BD oil鈥 used by this patient were 螖9-tetrahydrocannabinol (THC) at 19.5 [per cent], CBD at 20.05 [per cent] and tetrahydrocannabinolic acid (THCA) at 23.8 [per cent],鈥 the report stated.

    She had noticed a reduced appetite since taking the CBD oil, but apart from that, she had no other changes to her prescribed medications, diet or lifestyle 鈥 she was even still smoking one pack of cigarettes a week still, despite being advised to quit.

    The endocannabinoid system in humans, which was only identified in the 1990s, is still a mystery in many ways. Although we know it helps to regulate physiological and cognitive processes and manufactured endocannabinoids that 鈥渁ct as neuromodulators,鈥 just how this system can be tapped into with medication and drugs is a growing research avenue.

    Cannabis and cannabinoids in general do have proven therapeutic uses, such as assisting with chronic pain, anxiety and sleep disorders, but research into whether cannabinoids could be used as a direct cancer treatment has not yet come up with a clear answer.

    If the did play a part in the woman鈥檚 tumour shrinking, doctors aren鈥檛 sure how the active ingredients worked together to achieve this. Previous research into CBD and THC as treatments for cancer have had contradictory results at times, with THC having been shown in some studies to decrease tumour growth, but has been shown to increase cancer cells in other studies.

    Doctors also acknowledged that they were unable to confirm the full list of ingredients in the CBD oil this particular patient took.

    The patient certainly believe the CBD oil made the difference, and was quoted in the report as being 鈥渙ver the moon鈥 and intending to continue taking the CBD oil 鈥渋ndefinitely.鈥

    But one case report does not prove the treatment works 鈥 yet.

    鈥淎lthough there appears to be a relationship between the intake of 鈥楥BD oil鈥 and the observed tumour regression, we are unable to conclusively confirm that the tumour regression is due to the patient taking 鈥楥BD oil鈥,鈥 the report stated.

    鈥淢ore research is needed to identify the actual mechanism of action, administration pathways, safe dosages, its effects on different types of cancer and any potential adverse side effects when using cannabinoids.鈥

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