Case Report: Report of Objective Clinical Responses in Patients with Brain Cancer to Pharmaceutical-Grade Synthetic Cannabidiol

Case Report

Case Report: Report of Objective Clinical Responses in Patients with Brain Cancer to Pharmaceutical-Grade Synthetic Cannabidiol

  • Julian Kenyon 1*

*Corresponding Author: Julian Kenyon, Old Brewery, Winchester Hants, U.K.E-mail: jnkenyon@doveclinic.com

Citation: Julian Kenyon, Report of Objective Clinical Responses in Patients with Brain Cancer to Pharmaceutical-Grade Synthetic Cannabidiol. Brain and Neurological Disorders. 1(1); DOI: 10.31579/2642-973X/001

Copyright: © Julian Kenyon. This is an open-access article distributed under the terms of The Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Received: 10 November 2018 | Accepted: 26 November 2018 | Published: 04 December 2018

Keywords: cannabiodial; glioma;brain cancer;cannabinoids.

Abstract

Background/Aim: Cannabinoids are widely used in the management of pain, nausea and cachexia in cancer patients.   However, there has been  no  objective  clinical  evidence  of  any  anticancer  activity  yet.  The  aim  of  this  study  was  to  assess  the  effects  of  Pharmaceutical-Grade Synthetic Cannabidiol on a range of Brain Tumours

Patients and Methods: We analysed the data routinely collected as part of our treatment program in 11 Brain Cancer patients over a four- year period.

Results: Clinical responses were seen in all of these 11 patients, including a reduction in tumour size, as shown by repeat scans.

There  were  no  side  effects  of  any  kind  observed  when  using  Pharmaceutical-Grade  Synthetic  Cannabidiol.  Pharmaceutical-Grade  Synthetic

Cannabidiol was supplied by STI Pharmaceuticals.

Conclusion: Pharmaceutical-Grade Synthetic Cannabidiol is a candidate for treating glioma patients.

Introduction

The  phytocannabinoids  are  a  group  of  chemicals  extracted from the cannabis plant. A number of them are able to impede cancer cell growth, induce apoptosis and autophagy, and inhibit angiogenesis. The most widely known phytocannabinoid is Δ9-tetrahydrocannabinol (THC),  and  although  it  possesses  these  anticancer  effects,  it  is  also psychoactive, which has arguably hampered its clinical development. It  is  thought  that  these  actions  are  mediated  in  part  by  binding  to cannabinoid receptors that are expressed on a number of tissue types (1).  As  one  type  of the  receptor  is  found  exclusively on  brain  cells, studies using THC have focused on this tissue type. In vitro data were promising   and,   in   2016,   a   pilot   clinical   study   in   patients   with glioblastoma  multiforme indicated  THC was safe; however,  no  clear activity   was   reported   (2).   The   dosages   were   possibly   on   the conservative  side,  to  minimise  psychoactivity  that  would  naturally restrict the use of THC as drug. Of the 80+ phytocannabinoids, THC is possibly the only one to exhibit this psychoactivity. More recently, studies   have   diverted   away   from   THC   and   focussed   on   other cannabinoids.   The  next   most   abundant   compound   is   cannabidiol (CBD),   which   has  a  low  affinity  for   the  canonical   cannabinoid receptors. In contrast to THC, in its pure state, according to the World Health Organisation, CBD did not have abuse potential and caused no harm (3). Studies have shown that in addition to being able to induce cell  death  directly,  it  is  also  capable  of interfering  with  intracellular signalling (4). Alterations to pathways such as the PI3K/AKT/mTOR and the ERK, suggests that CBD can  modify the way certain cancer cells  react   to   other   treatments.   Indeed,  studies  have  shown   that combining CBD with  conventional chemotherapy such  as cytarabine and  vincristine  can  lead  to  enhanced  anticancer  activity  through modifications  to  these  signalling  pathways  (5,  6).  Furthermore,  the sequence  in  which  these  drugs  are  administered  can  also  influence overall   activity   (5).   Studies   have   also   indicated   that   in   certain leukaemia cell lines, CBD can increase the expression of the cyclin- dependent kinase inhibitor p21waf1  (6). This increased level appears to be maintained by CBD, which inadvertently impedes cell death.

Cytotoxicity  can  be  restored  in  these  cells  if  the  treatment regimen  was  altered  to  allow  for  a  temporary  cessation  of  exposure  to CBD. Thus, the general efficacy of CBD may also be altered by adapting treatment protocols that include “drug-free” phases (6). The combination of  Cannabinoids  and  Δ9  Tetrahydrocannabinol  has  been  shown  to  be  a radiosensitiser (7).

The  findings  of  a  number  of  studies  designed  to  examine  the  role  of cannabinoids in in the management of cancer symptoms varied. The most recent   prospective   analysis   of   nearly   3,000   patients   using   medical marijuana    showed    that    a    large    proportion    of    patients    reported improvement   in  their   condition   (8).  Patients  often   feel   conventional therapies  are  not  working  for  them,  and  so  they  search  the  internet  for alternative  medicines.  It  is  here  that  they  find  stories  about  cannabis working in patients with cancer, and understandably feel it is a route for them.  The  cannabis  products  they  use  vary,  and  can  be  in  the  form  of whole plant extracts or purified oils; however,  whatever the source, they self-prescribe  dosages.  A  number  of  anecdotal  positive  responses  have been reported, which sustains the interest in this type of medication.

In  order  to  assess  its  potential  use,  we  focused  on  giving  patients  with Brain   Cancers   of   various   sorts   (DIPG,   Anaplastic   Ependymoma, Glioblastoma  Multiforme)  a  Pharmaceutical-  Grade  Synthetic  product  at appropriate doses. Every patient in this study signed an informed consent allowing anonymous use of their data. Results with a whole range of solid tumours  treated  with  Pharmaceutical-Grade  Synthetic  Cannabidiol  has been previously reported (10).

Case presentations

Patients     were     given     synthetic,     Pharmaceutical-Grade     Synthetic Cannabidiol  (STI  Pharmaceuticals),  registered  under  the  Pharmaceutical Specials  scheme  in  oily  drops  at  5%  (w/v)  in  20  ml  bottles.  Each  drop contained 1 mg of synthetic CBD in neutral oil. This was prescribed on an informed  consent  basis.  11  Brain  Tumour  patients  decided  to  have  this treatment (Table 1).

Table I. Tabular presentation of our results in 11 Brain Cancer patients.

Several   of  these  patients   had  already  been   taking  Cannabis  Oil extracted from the Cannabis plant and bought on the Internet, with no beneficial  response.  This  is  currently  illegal,  as  the  Medicines  and Health Regulatory Agency has defined CBD as a medicinal product, which  can  only  be  prescribed  under  the  Pharmaceutical  Specials scheme,  as  it  is  not  currently a  licensed  medicinal  product.  Eight  of these  patients  used  Pharmaceutical-Grade  Synthetic  Cannabidiol  as the only treatment(9).

CBD  was  administered  on  three  days  on  and  three  days  off  basis, which  clinically  was  found  to  be  more  effective  than  giving  it  as  a continuous  dose.  The  average  dose  was  10  mg  twice  a  day.  For increased tumour mass, the dose was increased, in some cases up to 30 drops twice a day (30 mg). In a number of cases where stable disease was present, the dose was reduced to five drops twice a day (5 mg). In some  cases,  Sativex,  which  is  licensed  for  use  in  multiple  sclerosis, was  used  in  conjunction  with  CBD  as  a  source  of  THC,  which synergises  with  CBD  (10).  A  fraction  of  the  dose  used  for  multiple sclerosis was used. Two sprays of Sativex were given twice a day in three   days   on   and   three   days   off   pattern   as   in   the   case   of Pharmaceutical-Grade  Synthetic  Cannabidiol;  patients  on  continuous dosing did not do as well as

those on this on-off repeating regimen. Some of these patients reverted to cannabis oil bought on the Internet, and following this, the majority of these cases relapsed.

We  were  unable  to  define  a  maximum  tolerated  dose  for  CBD,  as there was a complete absence of side effects. The minimum duration of treatment  required  for  CBD  was  six  months,  but  many continued for  longer.  Less  than  six  months  appeared  inadequate  and  had  little effect,  and  therefore cases in  which  CBD was used  for less than  six months  have  been  defined  as  un-assessable,  and  not  included  in  the current cohort of 11 cases.

We  sought  clear  objective  evidence  of  potential  efficacy  where  no other treatment option was available. The most impressive case was a five-year old male patient with an anaplastic ependymoma, a very rare brain tumour. The patient had had all standard treatments, surgery on two   occasions   followed   by  chemotherapy  and   conformal   photon radiotherapy. No further treatment options were available to him when treatment  on  CBD  started  in  February  2016.  A  scan  carried  out  in December 2016 showed that tumour volume had decreased by ~60%. Further  scans,  carried  out  since  December  2016,  continued  to  show stable disease. CBD was the only treatment. Four scans with the scan report at the top of each scan are appended (Figure 1A-D).

Figure 1

Study  06  01  2016  Further  enlargement  of  the  posterior  fossa  mass. There  are  some  (particularly  multimodal)  features  of  radionecrosis but in the context of a previously rapidly progressive tumour then an element  of  disease  progression  should  also  be  considered.  A  short term follow up scan would be informative.  (a)

Study  13  04  2016.  Conclusion:  Further  tumour  progression  and development of moderately severe supratentorial hydrocephalus  (b)

30  09  16.  Conclusion:  Substantial  improvement/reduction  in  size  of the  residual  disease.  There  has  been  a  substantial  improvement  in appearances  with  marked  reduction  in  size  of  the  posterior  fossa tumour from 3.4 x 3.2cm in the saggital plane to 1.7 x 1.7cm  (c)

Study done 14 12 2016.Consulsion: Continued Slow improvement. Clinical information: Impressive resolution of left CPA Recurrent Ependymoma repeat scan in two months.  (d)

Another  impressive  case  was  a  50-year-old  patient  with  progressive tanycytic ependymoma Grade 2 diagnosed in June 2013, treated with biopsy  and  radical  radiotherapy,  which  was  completed  on  3rd   June

2015. He refused chemotherapy, and had no further treatment options. He started on pharmaceutical-grade synthetic CBD in July 2016 at a dose  of  10  drops  twice  a  day,  three  days  on  and  three  days  off  (10 mg).  Prior  to  this  he  had  been  taking,  for  some  time,  metformin, mebendazole, doxycycline and atorvastatin from an oncology clinic in Central London.

In January 2017 a repeat scan showed tumour reduction. At that point the  patient  stopped  taking  pharmaceutical-grade  synthetic  CBD  and switched  to  cannabis  oil  extract  obtained  from  an  internet  website. Further scans carried out in February 2018 showed doubling of tumour size and  more  growth  down  the brain  stem. He has     since restarted pharmaceutical-grade synthetic CBD and throughout continued to take the  metformin,  atorvastatin,  doxycycline  and  mebendazole.  So,  the only change in November 2017 had been stopping the pharmaceutical- grade synthetic CBD and switching to cannabis oil extract obtained on the Internet (Figure 2A, B).

Figure 2—Scan report 1

There   is   a   reduction   in   size   and   enhancement   of   the   left periventricular tumour. There is almost complete resolution of the parenchymal  enhancement  with  a  couple  of  small  ependymal nodules  remaining,  but  slightly  smaller.  There  is  no  significant change    in    the    T2/FLAIR    appearance    with   Wallarian    de- generation extending into the corticospinal tracts.  (a)

Figure 2 – Scan report 2

There is evidence of disease progression with a near doubling  of the enhancing  soft  tissue  arising  from  the  ependymal  surface  of  the  left lateral  ventricle  and  projecting  into  the  body  of  the  left  lateral ventricle.  There  are  new  enhancing  foci  in  the  left  putamen  and subthalamic  region  with  further  non  –enhancing  T2  hyperintense tumour extending inferiorly into the left cerebral peduncle. (b)

Discussion

From  our  laboratory  studies,  we  would  not  expect  any  significant  anti- cancer  activity  using  continuous  CBD  alone,  as  we  have  only  observed cancer  cell  line  apoptosis  (cell  death)  when  the  agent  is  washed  out  of culture and withdrawn.   We have also observed a potential increased cell killing ability when given after chemotherapy.

Cannabinoids have an accepted useful role in the management of cancer symptoms,  namely pain  control,  nausea  and  cachexia,  but not  as  part  of primary   treatment.   The   fact   that   we   have   been   able   to   document improvement in cancer in few patients strongly supports further studies of CBD-based  products  in  cancer  patients  who  have  exhausted  standard treatments.  Our  primary  data  in  a  murine  glioma  model  (7)  showing enhanced sensitivity to radiotherapy without any side effects, suggests this would be an ideal clinical trial to initiate in the first instance.

References

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