Medicinal cannabinoids in palliative care

Phytocannabinoids CBD, CBG, and their Derivatives CBD-HQ and CBG-A Induced In Vitro Cytotoxicity in 2D and 3D Colon Cancer Cell Models

Phytocannabinoids, compounds found in Cannabis sativa L., are used in oncology and palliative care to reduce the adverse reactions of standard therapies. Cancer patients use formulations of Cannabis sativa L. to manage the anxiety, pain, and nausea associated with cancer treatment, and there is growing evidence that some of them may exhibit anticancer properties. In this study, we tested the anticancer potential of selected cannabinoids CBD (cannabidiol) and its quinone derivative CBD-HQ (cannabidiol hydroquinone), CBG (cannabigerol) and its acid derivative CBG-A (cannabigerolic acid), as well as a combination of CBD+CBG on the colon cancer cell line SW-620. The MTT assay was used to determine the cannabinoids' ability to induce colon cancer cell death. All cannabinoids were cytotoxic at the lowest concentration (3 μg/mL). The half maximal inhibitory concentration (IC50) ranged from 3.90 to 8.24 μg/mL, depending on the substance. Cytotoxicity was confirmed in a 3D spheroidal cell culture with calcein and propidium iodide staining. The amount of intracellular reactive oxygen species (ROS) was examined using a DCF-DA assay. CBG showed the lowest antioxidant activity of all the cannabinoids tested. The level of intracellular ROS decreased only by 0.7-18%. However, CBG-A induced the strongest reduction in ROS level by 31-39%. Our results suggest that cannabinoids represent an interesting research direction with great implementation potential. These preliminary results represent the beginning of research into the potential of these substances for anticancer treatment and underscore the potential for further research.

'What price do you put on your health?': Medical cannabis, financial toxicity and patient perspectives on medication access in advanced cancer

INTRODUCTION

Following 2016 legislation permitting limited access to cannabis for research and medicinal purposes, the number of randomized clinical trials (RCTs) investigating the effectiveness of medicinal cannabis (MC) on symptom burden relief in cancer contexts has increased in Australia. This study aimed to understand the perceptions, hopes and concerns of people with advanced cancer regarding the future availability and regulation of MC in Australia.

METHODS

This qualitative study draws on semistructured interviews conducted between February 2019 and October 2020 in Brisbane, Australia, as part of an MC RCT substudy. Interviews were undertaken on 48 patients with advanced cancer in palliative care eligible to participate in an MC trial (n = 26 participated in an RCT; n = 2 participated in a pilot study; n = 20 declined). Interviews included a discussion of patients' decision-making regarding trial participation, concerns about MC and perceptions of future availability, including cost. Transcribed interviews were analysed inductively and abductively, informed by constructivist thematic analysis conventions.

RESULTS

Overall, participants supported making MC legally accessible as a prescription-only medication. Fear of financial toxicity, however, compromised this pathway. Steep posttrial costs of accessing MC prompted several people to decline trial participation, and others to predict-if found effective-that many would either access MC through alternative pathways or reduce their prescribed dosage to enable affordable access.

CONCLUSIONS

These findings suggest that-despite a relatively robust universal healthcare system-Australians are potentially vulnerable to and fearful of financial toxicity. Prevalent in the United States, financial toxicity occurs when disadvantaged cancer patients access necessary but expensive medications with lasting consequences: bankruptcy, ongoing anxiety and cancer worry. Interview transcripts indicate that financial fears-and the systems sustaining them-may pose a threat to RCT completion and to equitable access to legal MC. Such findings support calls for embedding qualitative substudies and community partnerships within RCTs, while also suggesting the importance of subsidisation to overcoming injustices.

PATIENT OR PUBLIC CONTRIBUTION

A patient advisory committee informed RCT design. This qualitative substudy foregrounds patients' decision-making, perceptions and experiences.

Using a qualitative sub-study to inform the design and delivery of randomised controlled trials on medicinal cannabis for symptom relief in patients with advanced cancer

BACKGROUND

Recruitment for randomised controlled trials in palliative care can be challenging; disease progression and terminal illness underpin high rates of attrition. Research into participant decision-making in medicinal cannabis randomised controlled trials (RCTs) is very limited. Nesting qualitative sub-studies within RCTs can identify further challenges to participation, informing revisions to study designs and recruitment practices. This paper reports on findings from a qualitative sub-study supporting RCTs of medicinal cannabis for symptom burden relief in patients with advanced cancer in one Australian city.

METHODS

Semi-structured qualitative interviews were conducted with 48 patients with advanced cancer, eligible to participate in a medicinal cannabis RCT (n=28 who consented to participate in an RCT; n=20 who declined). An iterative and abductive approach to thematic analysis and data collection fostered exploration of barriers and enablers to participation.

RESULTS

Key enablers included participants' enthusiasm and expectations of medicinal cannabis as beneficial (to themselves and future patients) for symptom management, especially after exhausting currently approved options, and a safer alternative to opioids. Some believed medicinal cannabis to have anti-cancer effects. Barriers to participation were the logistical challenges of participating (especially due to driving restrictions and fatigue), reluctance to interfere with an existing care plan, cost, and concerns about receiving the placebo and the uncertainty of the benefit. Some declined due to concerns about side-effects or a desire to continue accessing cannabis independent of the study.

CONCLUSIONS

The findings support revisions to subsequent medicinal cannabis RCT study designs, namely, omitting a requirement that participants attend weekly hospital appointments. These findings highlight the value of embedding qualitative sub-studies into RCTs. While some challenges to RCT recruitment are universal, others are context (population, intervention, location) specific. A barrier to participation found in research conducted elsewhere-stigma-was not identified in the current study. Thus, findings have important implications for those undertaking RCTs in the rapidly developing context of medical cannabis.

The Design and Impact of an Interprofessional Education Event Among Pharmacy and Nursing Students in Palliative Care-RnRx

Nearly all reports of interprofessional education (IPE) in palliative care have excluded pharmacy students. This article describes an IPE event between pharmacy and nursing students and assesses its impact on IPE competencies. Second-year nursing students and third-year pharmacy students participated in an evening-long event, focused on a married couple who each require palliative care-one for end-of-life planning and one for chronic disease progression. The impact of the event was assessed using the Interprofessional Collaborative Competency Attainment Scale (ICCAS) and qualitative feedback. Two hundred nine (96.7%) completed the ICCAS, and 16 of the 20 statements of the ICCAS showed large positive effect sizes (Cohen d ≥ 0.8), with the remaining 4 showing moderate positive effect sizes (Cohen d ≥ 0.5). The greatest effect sizes were related to improved awareness of complementary skillsets and knowledge between the professions. Addressing team conflict and including the patient/family in decision-making showed the least improvement. While ongoing interactions are ideal for the development of skills related to conflict and team development, this article demonstrates that even a 1-time activity can have an impact on students' interprofessional care competence.

Medicinal cannabinoids in palliative care

The treatment of symptoms in people with palliative diagnoses begins with meticulous clinical assessment with treatment choice(s) selected based on an understanding of the symptom aetiology and the evidence which underpins its treatment. Increasingly, the merits of palliative care have been established earlier in the disease trajectory where treatment outcomes may include increased survival and maintenance of function. There is strong public support for the availability of medicinal cannabis, particularly for people with palliative diagnoses. There are several areas where there is potential for symptom benefits through modulation of the endocannabinoid system, though clinical data to date has been inconclusive in key symptoms such as pain and nausea, and data from other settings such as chemotherapy-induced nausea and vomiting not readily extrapolated. Ideally exploration of medicinal cannabinoids should occur within a clinical trial to accelerate the evidence base to inform practice. In people with refractory symptoms, the consideration of unregistered products or off-label prescribing should be guided by the potential influences of pharmacokinetic, pharmacodynamic and drug-drug interactions, supported by an informed discussion with the patient, and regular review of net clinical benefit.