nabilone in c.i.n.v. august 2007. 2 introduction present a scientific validation for cannabinoids...
TRANSCRIPT
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Nabilonein
C.I.N.V.
Nabilonein
C.I.N.V.
August 2007August 2007
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Introduction
• Present a scientific validation for cannabinoids (CBs) asserting their therapeutic effects through Omnineuromodulation
CBs activate CB1 endocannabinoid receptors, which are omnipresent throughout the Central Nervous System (CNS)
Action on these receptors modulates neuronal signaling
• Review evidence showing how omnineuromodulation underlies the therapeutic role of CBs in the management of Chemotherapy-Induced Nausea and Vomiting (CINV)
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The Ubiquitous CB1
• Endogenous CBs are a major class of neuromodulators, acting through receptors, CB1 and CB2
• CB1 receptors are primarily located on CNS neurons
Levels exceed those of nearly all neurotransmitter receptors
• Exogenous CBs exert their effects by driving this innate system, often mimicking and enhancing its natural functions
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The Ubiquitous CB1
• The omnipresent central distribution of CB1, has led to the term, Omnineuromodulator, to describe CB action
• Therapeutic effects are primarily due to agonist action in brain regions that mediate nausea/vomiting, appetite, and neuropathic pain
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Omnineuromodulation
• Nabilone acts on presynaptic CB1 receptors, similar to endocannabinoids
Inhibits the release of excitatory (e.g., glutamate) and inhibitory (e.g., GABA) neurotransmitters
• The primary effect on neuronal signaling appears to be inhibitory, but network effects may be complex and hence modulatory in nature
• Endogenous CB1 ligands act “backwards” from classical neurotransmitters by serving as retrograde synaptic messengers
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A Sequential Overview of Omnineuromodulation
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Neurotransmitter (NT) released from vesicles within the presynaptic neuron activates the postsynaptic neuron
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Activation of the postsynaptic neuron leads to the biosynthesis and nonvesicular release of an endocannabinoid, likely via a calcium mediated process
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The endocannabinoid diffuses back to and binds to the presynaptic CB1 receptor
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The CB1 receptor activates a G protein which can lead to a number of presynaptic downstream events (e.g., effects on ion currents) that result in the inhibition of neurotransmitter release
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CB agents, acting as Omnineuromodulators, circumvent this multi-step process by directly activating CB1 receptors to stimulate the endogenous CB system, enhancing its function
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Summary of Actions of the Cannabinoids
Neurotransmitter (NT) from presynaptic neuron activates the postsynaptic neuron.
1
23
4
5
Endogenous and ExogenousCannabinoids Reduce Neuronal
Signaling
PostsynapticNeuron
NeurotransmitterReceptor
Endogenous CannabinoidRetrograde Signaling
CB1 Receptor
PresynapticNeuron
Inhibition ofNeurotransmitter
Release
Cannabinoid Therapy(nabilone)
Activated postsynaptic neuron releases endocannabinoids.
Endogenous CB1 ligand diffuses back to and binds to the presynaptic CB1 receptor.
CB1 receptor activates a G-protein, leading to inhibition of NT release.
Nabilone is thought to activate CB1 receptors directly, mimicking the effects of endocannabinoids.
1
2
3
4
5
*see notes for references
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Anti-emetic, Anti-nausea Effects of Cannabinoids
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Causes of nausea and vomiting/emesis: Viral illness Cancer Chemotherapy Radiotherapy
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• The Nucleus of the Solitary Tract (NTS) in the DVC receives information about:
Blood-borne emetics via the brainstem (BS) “Chemo-receptor Trigger Zone” Abdominal irritants via vagal afferents
• NTS neurons, in turn, project to a BS central pattern generator, which coordinates vomiting behavior
Dorsal Vagal Complex (DVC)
- NTS
Dorsal Vagal Complex (DVC)
- NTS
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Higher cortical and limbic regions (governing taste, smell, sight, pain, memory and emotion) can suppress or stimulate nausea/vomiting through descending connections to the BS emetic circuitry
Cortex Limbic System
Cortex Limbic System
Brainstem Emetic Circuitry
Brainstem Emetic Circuitry
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• Cannabinoids are thought to exert their antiemetic effects primarily via action on CB1 receptors in the NTS and higher cortical and limbic regions
Indirect, partial actions on 5-HT and DA signaling via 5-HT3 and D2 receptors are implicated Dorsal Vagal
Complex - NTS
Dorsal Vagal Complex
- NTS
Brainstem Emetic
Circuitry
Brainstem Emetic
Circuitry
Cortex Limbic System
Cortex Limbic System
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Summary
• CB agonists act as Omnineuromodulators—a term that describes their role in activating CB1 endocannabinoid receptors, which are omnipresent throughout the CNS and modulate neuronal signaling
• Evidence shows that Omnineuromodulation underlies the therapeutic role of CB agents in the treatment of CINV, Cachexia, and Neuropathic Pain
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Approved License for the treatment of nausea and vomiting associated with cancer chemotherapy in patients who have failed to respond adequately to
conventional anti-emetic treatments
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• Nabilone delivers:1
Convenient BID dosing: The usual adult dosage is 1 or 2 mg BID
Predictable pharmacokinetics: Peak plasma concentrations occur within 2 hours following oral administration
Long acting: 8 to 12 hour duration of action
Not detected by the EMIT test2
• In anti-emetic phase III studies, involving 316 cancer patients receiving a variety of chemotherapeutics (including cisplatin), nabilone was shown to be superior in efficacy to placebo, as well as to prochlorperazine, in:1
Reduction of vomiting episodes
Reduction of nausea severity
Improvement in appetite
Investigators’ global impression of efficacy3
*see notes for references
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Nabilone Pivotal StudiesNabilone Pivotal Studies
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Placebo-Controlled, Fixed-Dose Trials
Primary Endpoint: Patient-Rated Efficacy Criteria
Both Cycles Combined
Frequency of Vomits Severity of Nausea Food Intake
Average Day 1 Average Day 1 Average Day 1
Nabilone Investigator 01 8.55 8.55 2.29 2.27 0.55 0.55 Investigator 02 4.16 5.58 1.19 1.45 0.84 0.75 Investigator 03 10.27 15.20 1.73 2.00 1.20 1.20 Investigator 04 2.33 2.33 1.75 1.75 1.00 1.00 Investigator 05 2.97 2.97 1.03 1.03 1.28 1.28 Investigator 06 4.53 4.53 1.25 1.25 1.33 1.33
Composite 4.51 5.09 1.31 1.39 1.10 1.09 Placebo
Investigator 01 13.73 13.73 2.89 2.91 0.38 0.36 Investigator 02 13.05 15.03 2.08 2.39 0.63 0.61 Investigator 03 34.60 36.80 2.67 2.80 0.40 3.40 Investigator 04 14.83 14.83 2.75 2.75 0.63 0.63 Investigator 05 7.47 7.47 2.25 2.25 0.50 0.50 Investigator 06 6.87 6.86 2.06 2.06 0.92 0.92
Composite 10.81 11.43 2.25 2.34 0.64 0.64
Number of vomitsNausea severity: 0=none, 1=mild, 2=moderate, 3=severeFood intake: 0=none, 1=less than usual, 2=usual amount or average, 3=more than usual
Data on File: Protocols 9, 20 and 28. Valeant Pharmaceuticals International.
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Active-Controlled, Fixed-Dose Trials
Primary Endpoint: Patient-Rated Efficacy Criteria
Number of vomitsNausea severity: 0=none, 1=mild, 2=moderate, 3=severeFood intake: 0=none, 1=less than usual, 2=usual amount or average, 3=more than usual
Data on File: Protocols 9, 20 and 28. Valeant Pharmaceuticals International.
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Primary Endpoint: Investigator-Rated Efficacy and Safety
Active-Controlled, Fixed-Dose Trials
Efficacy: 1=very good, 2=good, 3=fair, 4=poor, 5=very poorSafety: Based on the frequency of adverse events
Data on File: Protocols 9, 20 and 28. Valeant Pharmaceuticals International.
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Active-Controlled, Flexible-Dose Trial
Primary Endpoint: Patient-Rated Efficacy Criteria
Number of vomitsNausea severity: 0=none, 1=mild, 2=moderate, 3=severeFood intake: 0=none, 1=less than usual, 2=usual amount or average, 3=more than usual
Data on File: Protocols 9, 20 and 28. Valeant Pharmaceuticals International.
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Patients Prefer Nabilone
Preferred Nabilone
Preferred Placebo
No Preference
Placebo-Controlled, Fixed-Dose Trials
Preferred Nabilone
Preferred ProchlorperazineNo Preference
Active-Controlled, Fixed-Dose Trials
77%
12%
12%
73%
20%
7%
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Summary: Nabilone and Reduction of Vomiting Frequency
ChemotherapyInducedNausea- and Vomiting
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28Data on File: Protocol #9, #20, and #28. Valeant Pharmaceuticals North America.
Nabilone Reduces the Frequency of Vomiting
10.8
9.6
**5.4*
4.5
0
2
4
6
8
10
12
Vomiting Frequency
Av
era
ge
Nu
mb
er
of
Vo
mit
s
N=75
**P < 0.007
N=129
*P < 0.01
Reduction in Frequency of Vomiting
Nabilone NabilonePlacebo Prochlorperazine
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29Einhorn LH, et al. J Clin Pharmacol. 1981;21:64S-69S.
10.30
5.09
3.603.24 2.97
1.12P=.003
1.25P=.001
1.08P<.001
2.05P<.001
7.05P<.001
0
2
4
6
8
10
12
Day 1 Day 2 Day 3 Day 4 Day 5
Nu
mb
er o
f Vo
mits
Nabilone Prochlorperazine
Nabilone Significantly Reduces Vomiting Frequency
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8%
20%
32%
68%
15%
75%P<.00172%
P<.01
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
CR PR No Response Preference
% o
f P
ati
en
ts
Nabilone Prochlorperazine
CR=complete response; PR=partial response
Herman TS, et al. N Engl J Med. 1979;300:1295-1297.
Nabilone: Superior to Prochlorperazine in Patients with Severe CINV
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CINV is an established indication for Nabilone
Clinical trials have confirmed the efficacy of Nabilone in reducing frequency of vomiting in cancer patients receiving chemotherapy
Nabilone is an important addition to the physician’s armamentarium against the nausea and vomiting associated with chemotherapy in
patients who have failed to respond adequately to conventional antiemetic therapy
Summary: Nabilone and Reduction of Vomiting Frequency
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Nabilone: In reduction of Nausea
ChemotherapyInducedNausea-
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30 randomized, comparative studies of cannabinoids with placebo or other antiemetics
(oral Nabilone [nabilone]= 16 studies; oral dronabinol=11 studies; intramuscular levonatrodol=1 study)
Active control= prochlorperazine, metoclopramide, chlorpromazine, haloperidol, domperidone, and alizapride
Tramèr MR, et al. BMJ. 2001;323:1-8.
70%
59%57%
43%
0%
10%
20%
30%
40%
50%
60%
70%
80%
Versus Placebo Versus Active
Co
mp
lete
co
ntr
ol o
f nau
sea
(% o
f pat
ien
ts)
Cannabinoid Control (placebo or active)
Control of Nausea Cannabinoids: A Systematic Review
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Comparative Efficacy of Nabilone vs. Prochlorperazine
Data on File: Protocol #9, #20, and #28. Valeant Pharmaceuticals North America.
*Based on patients’ report (daily average): 0=none; 1=mild; 2=moderate; 3=severe
2.3
1.8**
1.3*
1.3
0
1
2
3
4
5
6
7
8
Na
us
ea
se
ve
rity
(m
ea
n s
co
re)
Nabilone Placebo
N=129
*P < 0.001
N=75
**P < 0.007
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2.21
1.781.53 1.48
1.380.93
P=.0030.93
P<.0010.86
P<.001
1.18P<.001
1.96P=.049
0
0.5
1
1.5
2
2.5
3
Day 1 Day 2 Day 3 Day 4 Day 5
Nau
sea
seve
rity
(mea
n s
core
)
Nabilone Prochlorperazine
Score: 0=none; 1=mild; 2=moderate; 3=severe
Einhorn LH, et al. J Clin Pharmacol. 1981;21:64S-69S.
Nabilone Significantly Reduces Nausea Severity
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Severity of Nausea Significantly Reduced with Nabilone
11.1
0.60.3
P<.005
0.4P<.01
0.1P<.05
0
0.5
1
1.5
2
2.5
3
Day 1 Day 2 Day 3
Severity of Nausea
Sy
mp
tom
sc
ore
(m
ea
n)
Nabilone Prochlorperazine
Ahmedzai S, et al. Br J Cancer. 1983;48:657-663.
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Summary: Nausea
Nausea is more difficult to control than is vomiting
Control of nausea remains a significant unmet need in cancer patients receiving chemotherapy
Nabilone has demonstrated efficacy in reducing the severity of nausea
Patients prefer Nabilone over placebo and active controls (prochlorperazine, metoclopramide, chlorpromazine,
thiethylperazine, haloperidol, domperidone, alzapride)
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Several reductions in acute pain exacerbations and nighttime pain
Relief within 1 week of beginning Nabilone (n=1)
Patients’ testimonial
Taking Nabilone at night made pain more localized, and relief lasted until the
following afternoon
Nabilone made pain “livable”
Nabilone “takes the edge off”
Other benefits:Impact of Nabilone on Pain
45%
5%
15%
25%
0%
5%
10%
15%
20%
25%
30%
35%
40%
45%
50%
Pain Relief Temporary Partial Complete
% o
f P
ati
en
ts
A Retrospective Chart Review
Berlach DM, et al. Am Acad Pain Med. 2006;7:25-29.
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39Berlach DM, et al. Am Acad Pain Med. 2006;7:25-29.
Other Benefits of Nabilone
Improvement in quality or duration
of sleep
Decreased nausea or vomiting
3 patients continued to take Nabilone for benefits other than
pain relief
•50% of patients •25% of patients•Sleep improvements (n=1)
•Decreased nausea & increased appetite (n=1)
•Decreased nausea and vomiting and increased sleep (n=1)
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Benefits of Cannabinoids in Cancer Patients: A Retrospective Case Study
Cancer Patients referred for Palliative CareESAS available at baseline and follow-up
N=139
No Cannabinoid Rx
n=57
Cannabinoid RxTherapy Continued
n=65
Cannabinoid RxTherapy Stopped
n=17
Methodology
*Data on file
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Edmonton Symptom Assessment System (ESAS)
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Reasons for Cannabinoid Discontinuation
• 12/17 (71%) due to side effectsDrowsiness
Dizziness
Delirium
• 5/17 (29%) advised by other MDs
• Discontinuation Rate:Overall = 20.7%
Adjusted = 14.6%
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NabiloneTM (nabilone) Package Insert. Valeant Pharmaceuticals North America; 2006. Marinol® (dronabinol) Package Insert. Solvay Pharmaceuticals, Inc.
Differentiating Between the Cannabinoids: Pharmacokinetics
Nabilone Marinol
Oral Dosing1-2 mg 1-3 hrs before chemotherapy, and 2 times per day for up to 48 hrs afterwards
5 mg/m2 1-3 hrs before chemotherapy, and every 2-4 hrs afterwards for a total of 4-6 doses per day
Source Synthetic ∆9-THC analog Synthetic ∆9-THC
Formulation Crystalline powder capsule
Capsule formulated with sesame oil, among other ingredients (contraindicated in patients with a hypersensitivity to sesame oil)
Onset of Action 60-90 min 30-60 min
Peak plasma concentrations (Tmax) 2 hrs 2-4 hrs
Duration of Action 8-12 hrs 4-6 hrs for psychoactive effects
Metabolites 2 active metabolites2 active metabolites and more than 20 other metabolites
ClearanceMajor excretory pathway is the
biliary systemBiliary excretion is major route of elimination
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CYP450 Metabolizing
Enzymes
CYP450 Enzyme Inhibition
CYP450 Enzyme Induction
Nabilone 2C9*, 3A4
(aldehyde oxygenase)None to Date None to Date
Marinol 2C9*, 2C11, 3A4
(aldehyde oxygenase)3A4 None to Date
Nahas GG, Surim KM, Harvet DJ, Agurell S, eds. Marihuana and Medicine. Totowa, NJ: Human Press; 1999: 74-116. .
• Metabolized principally through the CYP450 2C9 isoenzyme
• No inhibitory or inducing effect on any of the isoenzymes
• Competes with very few medications at the metabolic level,
including opioids
• Examples of medications metabolized by CYP3A4: anti-
fungals, methadone, many anti-depressants, HIV protease
inhibitors
*Main metabolizing isoenzyme
Nab
ilon
eCannabinoid Metabolism
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Safety Overview of Cannabinoids
Nabilone™ MARINOL® (dronabinol)
Contraindications
In patients with a history of hypersensitivity to any cannabinoid
In patients with a history of hypersensitivity to any cannabinoid or sesame oil
Most Commonly Occurring Adverse Effects
DrowsinessVertigoDry mouthEuphoriaAtaxiaHeadacheConcentration difficulties
AstheniaPalpitationsTachycardiaVasodilatation/facial flushAbdominal painNauseaVomitingAmnesia
Nabilone (NabiloneTM) Package Insert; San Diego, Valeant Pharmaceuticals North America; 2006; Dronabinol (Marinol® ) Package Insert. Marietta, Ga: Solvay Pharmaceuticals, Inc.; 2003.
Cannabinoids should not be taken with alcohol, sedatives, hypnotics, or other psychoticomimetic substances
AtaxiaConfusionDepersonalizationDizzinessEuphoriaParanoid reactionSomnolenceThinking abnormal
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Summary
Treatment Challenges
Unique MOA of Cannabinoids
Clinical Trial Results
• CINV—a highly prevalent side effect of cancer treatment
• Persistent CINV is associated with several adverse sequelae
• Pain is often under-diagnosed and under-treated
• Target ubiquitous CB receptors in the CNS and periphery
• CINV: agonism of CB1 receptors inhibits neurotransmitters
• Pain: neuromodulatory effects involving both CB1 and CB2 receptors
• Support the use of cannabinoids to treat refractory CINV
• Suggest that cannabinoids may be useful adjunctive therapy for pain
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END SLIDEEND SLIDE
QUESTIONS?QUESTIONS?
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Adverse Events can be reported to the drug safety
department at Valeant Pharmaceuticals at [email protected]