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The purpose of this study is to determine the receptor occupancy (RO) associated with telcagepant (MK-0974) administration based on displacement of [11C]MK-4232 from the CGRP receptors in the brain using PET. The study enrolled healthy participants (Part I) and migraine patients (Part III). Due to a protocol amendment, study Part II was not conducted.
For the 1120 mg (i.e., maximal) telcagepant dose, [11C]MK-4232 was administered and PET scan was started ~3 hours post telcagepant to coincide with the Tmax of the 1120 mg dose. For the 140 mg (i.e., therapeutic) telcagepant dose, [11C]MK-4232 was administered and PET scan was started ~2 hours post telcagepant to correspond with the timing of clinical efficacy measurements of telcagepant for migraine treatment in Phase III studies.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Healthy Participants (Part I) | Experimental | Baseline PET imaging of the brain using [11C]MK-4232 tracer (~300 megabecquerel [MBq]) was performed in healthy participants; this PET data served as the baseline for both Period 1 and 2 of Part I. Subsequently in study Part I, Period 1 the healthy participants received a single 1120 mg dose of telcagepant followed by PET imaging of brain with [11C]MK-4232 tracer (~300 MBq) beginning ~3 hours post telcagepant dose. In Part I, Period 2 the healthy participants received a single 140 mg dose of telcagepant followed by PET imaging of brain with [11C]MK-4232 tracer (~300 MBq) beginning ~2 hours post telcagepant dose. Interval between Part I Period 1 and 2 was to be at least 1 week. |
|
| Participants with Migraine (Part III) | Experimental | In study Part III, Period 1 baseline PET imaging of the brain using [11C]MK-4232 tracer (~300 MBq) was performed in participants with migraine during a migraine attack (ictal phase). Later in Part III, Period 1 the participants with an ongoing migraine attack (ictal phase) received a single 140 mg dose of telcagepant followed by PET imaging of brain with [11C]MK-4232 tracer (~300 MBq) beginning ~2 hours post telcagepant dose. In Part III, Period 2 baseline PET imaging of the brain using [11C]MK-4232 tracer (~300 MBq) was performed in participants with migraine, however, without a migraine attack ongoing (interictal phase). Later in Part III, Period 2 participants with migraine without a migraine attack ongoing (interictal phase) received a single 140 mg dose of telcagepant followed by PET imaging of brain with [11C]MK-4232 tracer (~300 MBq) beginning ~2 hours post telcagepant dose. Interval between Part III Period 1 and 2 was to be at least 1 week. |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| telcagepant | Drug | Single oral doses of telcagepant 1120 mg (Part I - Period 1) and 140 mg (Part I - Period 2; Part III - Period 1 and 2) |
|
| Measure | Description | Time Frame |
|---|---|---|
| Number of Participants With Adverse Events (AEs) (Part I) | Any AEs occurring among participants (all were healthy subjects) in Part I of study were recorded. An AE was defined as any unfavorable and unintended change in the structure, function or chemistry of the body temporally associated with study drug administration, whether or not considered related to the study drug. Any worsening (i.e., any clinically significant adverse change in frequency and/or intensity) of a preexisting condition which was temporally associated with the administration of the study drug, was also an AE. | Up 14 days after the last dose of telcagepant and/or [11C]MK-4232 in Part I of study (Up to approximately 14 weeks) |
| Number of Participants With AEs (Part III) | Any AEs occurring among participants (all were migraine patients) in Part III of study were recorded. An AE was defined as any unfavorable and unintended change in the structure, function or chemistry of the body temporally associated with study drug administration, whether or not considered related to the study drug. Any worsening (i.e., any clinically significant adverse change in frequency and/or intensity) of a preexisting condition which was temporally associated with the administration of the study drug, was also an AE. | Up 14 days after the last dose of telcagepant and/or [11C]MK-4232 in Part III of study (Up to approximately 6 months) |
| Brain Calcitonin Gene-related Peptide (CGRP) Receptor Occupancy (RO) Post Telcagepant Obtained by PET Imaging Using [11C]MK-4232 Tracer at Baseline and After a Maximum Dose of Telcagepant (1120 mg) in Healthy Participants (Part I, Period 1) | Brain CGRP RO post telcagepant was determined by change in [11C]MK-4232 PET tracer biokinetics at baseline and post telcagepant administration. Using PET brain images acquired over ~0-90 minutes after [11C]MK-4232 dose, regions of interest (ROIs) were drawn throughout cerebral cortex and white matter, striatum, thalamus, cerebellum and pons. The ROIs were projected onto all frames of the dynamic PET scans in order to generate [11C]MK-4232 tissue time-activity curves (TACs). Serial arterial blood samples for measurement of plasma radioactivity and [11C]MK-4232 concentrations were collected during the PET scans. These samples provided the arterial input function for a two-tissue compartmental model of [11C]MK-4232 tracer biokinetics. Total volume of distribution (VT), an index of receptor density, was estimated by fitting the two-tissue compartmental model to the PET [11C]MK-4232 TACs. Change in VT between baseline and post telcagepant PET studies was used to quantify the brain CGRP RO. |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Medical Director | Merck Sharp & Dohme LLC | Study Director |
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| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 23975906 | Result | Hostetler ED, Joshi AD, Sanabria-Bohorquez S, Fan H, Zeng Z, Purcell M, Gantert L, Riffel K, Williams M, O'Malley S, Miller P, Selnick HG, Gallicchio SN, Bell IM, Salvatore CA, Kane SA, Li CC, Hargreaves RJ, de Groot T, Bormans G, Van Hecken A, Derdelinckx I, de Hoon J, Reynders T, Declercq R, De Lepeleire I, Kennedy WP, Blanchard R, Marcantonio EE, Sur C, Cook JJ, Van Laere K, Evelhoch JL. In vivo quantification of calcitonin gene-related peptide receptor occupancy by telcagepant in rhesus monkey and human brain using the positron emission tomography tracer [11C]MK-4232. J Pharmacol Exp Ther. 2013 Nov;347(2):478-86. doi: 10.1124/jpet.113.206458. Epub 2013 Aug 23. |
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| ID | Type | URL | Comment |
|---|---|---|---|
| CSR Synopsis | View IPD |
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Due to protocol amendment study Part II was not conducted. One subject who started in Part I, Period 2 had not participated in Part I, Period 1. Therefore, the cumulative total number who started Part I (including those starting in Period 1 and 2) is 6. Study participants were included in either Part I or Part III; none were included in both parts.
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| ID | Title | Description |
|---|---|---|
| FG000 | Telcagepant and [11C]MK-4232 (Part I): Healthy Participants | Baseline positron emission tomography (PET) imaging of the brain using [11C]MK-4232 tracer (~300 megabecquerel [MBq]) was performed in healthy participants; this PET data served as the baseline for both Period 1 and 2 of Part I. Subsequently in study Part I, Period 1 the healthy participants received a single 1120 mg dose of telcagepant followed by PET imaging of brain with [11C]MK-4232 tracer (~300 MBq) beginning ~3 hours post telcagepant dose. In Part I, Period 2 the healthy participants received a single 140 mg dose of telcagepant followed by PET imaging of brain with [11C]MK-4232 tracer (~300 MBq) beginning ~2 hours post telcagepant dose. |
| Title | Milestones | Reasons Not Completed | |||||
|---|---|---|---|---|---|---|---|
| Part I, Period 1 |
|
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| [11C]MK-4232 | Drug | Single intravenous doses of ~300 MBq [11C]MK-4232 administered as a 5 minute infusion (Part I - Baseline, Period 1 and 2; Part III - Period 1 Baseline and Period 1, and Period 2 Baseline and Period 2) |
|
| Part I Baseline, at ~0-90 minutes after [11C]MK-4232 dose; and Part I, Period 1 post telcagepant, at ~0-90 minutes after [11C]MK-4232 dose |
| Average Telcagepant Plasma Concentration During PET Imaging Using [11C]MK-4232 Tracer After a Maximum Dose of Telcagepant (1120 mg) in Healthy Participants (Part I, Period 1) | In Part I, Period 1 blood samples for determination of plasma telcagepant concentrations were obtained prior to the telcagepant dose (time 0) and at 2, 3, 4 and 5 hours post telcagepant dose. The average plasma telcagepant concentration during the PET scan was determined, calculated as the area under the plasma telcagepant concentration versus time curve during the PET scanning interval divided by the duration of the PET scanning interval. | Part I, Period 1 post telcagepant, at ~0-90 minutes after [11C]MK-4232 dose |
| Brain CGRP RO Post Telcagepant Obtained by PET Imaging Using [11C]MK-4232 Tracer at Baseline and After a Therapeutic Dose of Telcagepant (140 mg) in Healthy Participants (Part I, Period 2) | Brain CGRP RO post telcagepant was determined by change in [11C]MK-4232 PET tracer biokinetics at baseline and post telcagepant administration. Using PET brain images acquired over ~0-90 miniutes after [11C]MK-4232 dose, ROIs were drawn throughout the cerebral cortex and white matter, striatum, thalamus, cerebellum and pons. The ROIs were projected onto all frames of the dynamic PET scans in order to generate [11C]MK-4232 tissue TACs. Serial arterial blood samples for measurement of plasma radioactivity and [11C]MK-4232 concentrations were collected during the PET scans. These samples provided the arterial input function for a two-tissue compartmental model of [11C]MK-4232 tracer biokinetics. VT, an index of receptor density, was estimated by fitting the two-tissue compartmental model to the PET [11C]MK-4232 TACs. The change in VT between the baseline and post telcagepant PET studies was used to quantify the brain CGRP RO. | Part I Baseline, at ~0-90 minutes after [11C]MK-4232 dose; and Part I, Period 2 post telcagepant, at ~0-90 minutes after [11C]MK-4232 dose |
| Average Telcagepant Plasma Concentration During PET Imaging Using [11C]MK-4232 Tracer After a Therapeutic Dose of Telcagepant (140 mg) in Healthy Participants (Part I, Period 2) | In Part I, Period 2 blood samples for determination of plasma telcagepant concentrations were obtained prior to the telcagepant dose (time 0) and at 1, 2, 3 and 4 hours post telcagepant dose. The average plasma telcagepant concentration during the PET scan was determined, calculated as the area under the plasma telcagepant concentration versus time curve during the PET scanning interval divided by the duration of the PET scanning interval. | Part 1, Period 2 post telcagepant, at ~0-90 minutes after [11C]MK-4232 dose |
| Brain CGRP RO Post Telcagepant Obtained by PET Imaging Using [11C]MK-4232 Tracer at Baseline and After a Therapeutic Dose of Telcagepant (140 mg) in Participants With Migraine During a Migraine Attack (Ictal Phase)(Part III, Period 1) | Brain CGRP RO post telcagepant was determined by change in [11C]MK-4232 PET tracer biokinetics at baseline and post telcagepant administration. Using PET brain images acquired over ~0-90 minutes after [11C]MK-4232 dose, ROIs were drawn throughout the cerebral cortex and white matter, striatum, thalamus, cerebellum and pons. The ROIs were projected onto all frames of the dynamic PET scans in order to generate [11C]MK-4232 tissue TACs. Serial arterial blood samples for measurement of plasma radioactivity and [11C]MK-4232 concentrations were collected during the PET scans. These samples provided the arterial input function for a two-tissue compartmental model of [11C]MK-4232 tracer biokinetics. VT, an index of receptor density, was estimated by fitting the two-tissue compartmental model to the PET [11C]MK-4232 TACs. The change in VT between the baseline and post telcagepant PET studies was used to quantify the brain CGRP RO. | Part III, Period 1 Baseline, at ~0-90 minutes after [11C]MK-4232 dose; and Part III, Period 1 post telcagepant, at ~0-90 minutes after [11C]MK-4232 dose |
| Brain CGRP RO Post Telcagepant Obtained by PET Imaging Using [11C]MK-4232 Tracer at Baseline and After a Therapeutic Dose of Telcagepant (140 mg) in Participants With Migraine During Period When Migraine is Absent (Interictal Phase)(Part III, Period 2) | Brain CGRP RO post telcagepant was determined by change in [11C]MK-4232 PET tracer biokinetics at baseline and post telcagepant administration. Using PET brain images acquired over ~0-90 minutes after [11C]MK-4232 dose, ROIs were drawn throughout the cerebral cortex and white matter, striatum, thalamus, cerebellum and pons. The ROIs were projected onto all frames of the dynamic PET scans in order to generate [11C]MK-4232 tissue TACs. Serial arterial blood samples for measurement of plasma radioactivity and [11C]MK-4232 concentrations were collected during the PET scans. These samples provided the arterial input function for a two-tissue compartmental model of [11C]MK-4232 tracer biokinetics. VT, an index of receptor density, was estimated by fitting the two-tissue compartmental model to the PET [11C]MK-4232 TACs. The change in VT between the baseline and post telcagepant PET studies was used to quantify the brain CGRP RO. | Part III, Period 2 Baseline, at ~0-90 minutes after [11C]MK-4232 dose; and Part III, Period 2 post telcagepant, at ~0-90 minutes after [11C]MK-4232 dose |
| FG001 | Telcagepant and [11C]MK-4232 (Part III): Migraineurs | In study Part III, Period 1 baseline PET imaging of the brain using [11C]MK-4232 tracer (~300 MBq) was performed in participants with migraine during a migraine attack (ictal phase). Later in Part III, Period 1 the participants with an ongoing migraine attack (ictal phase) received a single 140 mg dose of telcagepant followed by PET imaging of brain with [11C]MK-4232 tracer (~300 MBq) beginning ~2 hours post telcagepant dose. In Part III, Period 2 baseline PET imaging of the brain using [11C]MK-4232 tracer (~300 MBq) was performed in participants with migraine, however, without a migraine attack ongoing (interictal phase). Later in Part III, Period 2 participants with migraine without a migraine attack ongoing (interictal phase) received a single 140 mg dose of telcagepant followed by PET imaging of brain with [11C]MK-4232 tracer (~300 MBq) beginning ~2 hours post telcagepant dose. |
| Received Telcagepant |
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| Received [11C]MK-4232 |
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| COMPLETED |
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| NOT COMPLETED |
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| Part I, Period 2 |
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| Part III, Period 1 |
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| Part III, Period 2 |
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All participants who received at least one dose of study medication (telcagepant and/or [11C]MK-4232).
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| ID | Title | Description |
|---|---|---|
| BG000 | Telcagepant and [11C]MK-4232 (Part I): Healthy Participants | Baseline PET imaging of the brain using [11C]MK-4232 tracer (~300 MBq) was performed in healthy participants; this PET data served as the baseline for both Period 1 and 2 of Part I. Subsequently in study Part I, Period 1 the healthy participants received a single 1120 mg dose of telcagepant followed by PET imaging of brain with [11C]MK-4232 tracer (~300 MBq) beginning ~3 hours post telcagepant dose. In Part I, Period 2 the healthy participants received a single 140 mg dose of telcagepant followed by PET imaging of brain with [11C]MK-4232 tracer (~300 MBq) beginning ~2 hours post telcagepant dose. |
| BG001 | Telcagepant and [11C]MK-4232 (Part III): Migraineurs | In study Part III, Period 1 baseline PET imaging of the brain using [11C]MK-4232 tracer (~300 MBq) was performed in participants with migraine during a migraine attack (ictal phase). Later in Part III, Period 1 the participants with an ongoing migraine attack (ictal phase) received a single 140 mg dose of telcagepant followed by PET imaging of brain with [11C]MK-4232 tracer (~300 MBq) beginning ~2 hours post telcagepant dose. In Part III, Period 2 baseline PET imaging of the brain using [11C]MK-4232 tracer (~300 MBq) was performed in participants with migraine, however, without a migraine attack ongoing (interictal phase). Later in Part III, Period 2 participants with migraine without a migraine attack ongoing (interictal phase) received a single 140 mg dose of telcagepant followed by PET imaging of brain with [11C]MK-4232 tracer (~300 MBq) beginning ~2 hours post telcagepant dose. |
| BG002 | Total | Total of all reporting groups |
| Units | Counts |
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| Participants |
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| Title | Description | Population Description | Parameter Type | Dispersion Type | Unit of Measure | Calculate Percentage | Denominator Units Selected | Denominators | Classes | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Age, Continuous | Mean | Standard Deviation | years |
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| Sex: Female, Male | Count of Participants | Participants |
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| Type | Title | Description | Population Description | Reporting Status | Anticipated Posting Date | Parameter Type | Dispersion Type | Unit of Measure | Calculate Percentage | Time Frame | Units Analyzed | Denominator Units Selected | Arm/Group Information | Denominators | Classes | Analyses | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Primary | Number of Participants With Adverse Events (AEs) (Part I) | Any AEs occurring among participants (all were healthy subjects) in Part I of study were recorded. An AE was defined as any unfavorable and unintended change in the structure, function or chemistry of the body temporally associated with study drug administration, whether or not considered related to the study drug. Any worsening (i.e., any clinically significant adverse change in frequency and/or intensity) of a preexisting condition which was temporally associated with the administration of the study drug, was also an AE. | All participants who received at least one dose of study medication (telcagepant and/or [11C]MK-4232) in Part I of study. | Posted | Number | participants | Up 14 days after the last dose of telcagepant and/or [11C]MK-4232 in Part I of study (Up to approximately 14 weeks) |
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| Primary | Number of Participants With AEs (Part III) | Any AEs occurring among participants (all were migraine patients) in Part III of study were recorded. An AE was defined as any unfavorable and unintended change in the structure, function or chemistry of the body temporally associated with study drug administration, whether or not considered related to the study drug. Any worsening (i.e., any clinically significant adverse change in frequency and/or intensity) of a preexisting condition which was temporally associated with the administration of the study drug, was also an AE. | All participants who received at least one dose of study medication (telcagepant and/or [11C]MK-4232) in Part III of study. | Posted | Number | participants | Up 14 days after the last dose of telcagepant and/or [11C]MK-4232 in Part III of study (Up to approximately 6 months) |
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| Primary | Brain Calcitonin Gene-related Peptide (CGRP) Receptor Occupancy (RO) Post Telcagepant Obtained by PET Imaging Using [11C]MK-4232 Tracer at Baseline and After a Maximum Dose of Telcagepant (1120 mg) in Healthy Participants (Part I, Period 1) | Brain CGRP RO post telcagepant was determined by change in [11C]MK-4232 PET tracer biokinetics at baseline and post telcagepant administration. Using PET brain images acquired over ~0-90 minutes after [11C]MK-4232 dose, regions of interest (ROIs) were drawn throughout cerebral cortex and white matter, striatum, thalamus, cerebellum and pons. The ROIs were projected onto all frames of the dynamic PET scans in order to generate [11C]MK-4232 tissue time-activity curves (TACs). Serial arterial blood samples for measurement of plasma radioactivity and [11C]MK-4232 concentrations were collected during the PET scans. These samples provided the arterial input function for a two-tissue compartmental model of [11C]MK-4232 tracer biokinetics. Total volume of distribution (VT), an index of receptor density, was estimated by fitting the two-tissue compartmental model to the PET [11C]MK-4232 TACs. Change in VT between baseline and post telcagepant PET studies was used to quantify the brain CGRP RO. | Participants who received both telcagepant and [11C]MK-4232 during Part I, Period 1 of study, had evaluable data and were compliant with the the study protocol | Posted | Number | percent CGRP RO | Part I Baseline, at ~0-90 minutes after [11C]MK-4232 dose; and Part I, Period 1 post telcagepant, at ~0-90 minutes after [11C]MK-4232 dose |
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| Primary | Average Telcagepant Plasma Concentration During PET Imaging Using [11C]MK-4232 Tracer After a Maximum Dose of Telcagepant (1120 mg) in Healthy Participants (Part I, Period 1) | In Part I, Period 1 blood samples for determination of plasma telcagepant concentrations were obtained prior to the telcagepant dose (time 0) and at 2, 3, 4 and 5 hours post telcagepant dose. The average plasma telcagepant concentration during the PET scan was determined, calculated as the area under the plasma telcagepant concentration versus time curve during the PET scanning interval divided by the duration of the PET scanning interval. | Participants who received both telcagepant and [11C]MK-4232 during Part I, Period 1 of study, had evaluable data and were compliant with the the study protocol | Posted | Mean | Standard Deviation | μM | Part I, Period 1 post telcagepant, at ~0-90 minutes after [11C]MK-4232 dose |
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| Primary | Brain CGRP RO Post Telcagepant Obtained by PET Imaging Using [11C]MK-4232 Tracer at Baseline and After a Therapeutic Dose of Telcagepant (140 mg) in Healthy Participants (Part I, Period 2) | Brain CGRP RO post telcagepant was determined by change in [11C]MK-4232 PET tracer biokinetics at baseline and post telcagepant administration. Using PET brain images acquired over ~0-90 miniutes after [11C]MK-4232 dose, ROIs were drawn throughout the cerebral cortex and white matter, striatum, thalamus, cerebellum and pons. The ROIs were projected onto all frames of the dynamic PET scans in order to generate [11C]MK-4232 tissue TACs. Serial arterial blood samples for measurement of plasma radioactivity and [11C]MK-4232 concentrations were collected during the PET scans. These samples provided the arterial input function for a two-tissue compartmental model of [11C]MK-4232 tracer biokinetics. VT, an index of receptor density, was estimated by fitting the two-tissue compartmental model to the PET [11C]MK-4232 TACs. The change in VT between the baseline and post telcagepant PET studies was used to quantify the brain CGRP RO. | Participants who received both telcagepant and [11C]MK-4232 during Part I, Period 2 of study, had evaluable data and were compliant with the the study protocol | Posted | Number | percent CGRP RO | Part I Baseline, at ~0-90 minutes after [11C]MK-4232 dose; and Part I, Period 2 post telcagepant, at ~0-90 minutes after [11C]MK-4232 dose |
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| Primary | Average Telcagepant Plasma Concentration During PET Imaging Using [11C]MK-4232 Tracer After a Therapeutic Dose of Telcagepant (140 mg) in Healthy Participants (Part I, Period 2) | In Part I, Period 2 blood samples for determination of plasma telcagepant concentrations were obtained prior to the telcagepant dose (time 0) and at 1, 2, 3 and 4 hours post telcagepant dose. The average plasma telcagepant concentration during the PET scan was determined, calculated as the area under the plasma telcagepant concentration versus time curve during the PET scanning interval divided by the duration of the PET scanning interval. | Participants who received both telcagepant and [11C]MK-4232 during Part I, Period 2 of study, had evaluable data and were compliant with the the study protocol | Posted | Mean | Standard Deviation | μM | Part 1, Period 2 post telcagepant, at ~0-90 minutes after [11C]MK-4232 dose |
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| Primary | Brain CGRP RO Post Telcagepant Obtained by PET Imaging Using [11C]MK-4232 Tracer at Baseline and After a Therapeutic Dose of Telcagepant (140 mg) in Participants With Migraine During a Migraine Attack (Ictal Phase)(Part III, Period 1) | Brain CGRP RO post telcagepant was determined by change in [11C]MK-4232 PET tracer biokinetics at baseline and post telcagepant administration. Using PET brain images acquired over ~0-90 minutes after [11C]MK-4232 dose, ROIs were drawn throughout the cerebral cortex and white matter, striatum, thalamus, cerebellum and pons. The ROIs were projected onto all frames of the dynamic PET scans in order to generate [11C]MK-4232 tissue TACs. Serial arterial blood samples for measurement of plasma radioactivity and [11C]MK-4232 concentrations were collected during the PET scans. These samples provided the arterial input function for a two-tissue compartmental model of [11C]MK-4232 tracer biokinetics. VT, an index of receptor density, was estimated by fitting the two-tissue compartmental model to the PET [11C]MK-4232 TACs. The change in VT between the baseline and post telcagepant PET studies was used to quantify the brain CGRP RO. | Results could not be obtained for this measure. For Part III data, the curve fits were unsatisfactory (model curves did not pass through the TAC data points) precluding the quantification of the VT and RO | Posted | Part III, Period 1 Baseline, at ~0-90 minutes after [11C]MK-4232 dose; and Part III, Period 1 post telcagepant, at ~0-90 minutes after [11C]MK-4232 dose |
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| Primary | Brain CGRP RO Post Telcagepant Obtained by PET Imaging Using [11C]MK-4232 Tracer at Baseline and After a Therapeutic Dose of Telcagepant (140 mg) in Participants With Migraine During Period When Migraine is Absent (Interictal Phase)(Part III, Period 2) | Brain CGRP RO post telcagepant was determined by change in [11C]MK-4232 PET tracer biokinetics at baseline and post telcagepant administration. Using PET brain images acquired over ~0-90 minutes after [11C]MK-4232 dose, ROIs were drawn throughout the cerebral cortex and white matter, striatum, thalamus, cerebellum and pons. The ROIs were projected onto all frames of the dynamic PET scans in order to generate [11C]MK-4232 tissue TACs. Serial arterial blood samples for measurement of plasma radioactivity and [11C]MK-4232 concentrations were collected during the PET scans. These samples provided the arterial input function for a two-tissue compartmental model of [11C]MK-4232 tracer biokinetics. VT, an index of receptor density, was estimated by fitting the two-tissue compartmental model to the PET [11C]MK-4232 TACs. The change in VT between the baseline and post telcagepant PET studies was used to quantify the brain CGRP RO. | Results could not be obtained for this measure. For Part III data, the curve fits were unsatisfactory (model curves did not pass through the TAC data points) precluding the quantification of the VT and RO | Posted | Part III, Period 2 Baseline, at ~0-90 minutes after [11C]MK-4232 dose; and Part III, Period 2 post telcagepant, at ~0-90 minutes after [11C]MK-4232 dose |
|
Up 14 days after the last dose of telcagepant and/or [11C]MK-4232 (Up to approximately 14 weeks for Part I, Up to approximately 6 months for Part III)
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| ID | Title | Description | Deaths (Affected) | Deaths (At Risk) | Serious Events (Affected) | Serious Events (At Risk) | Other Events (Affected) | Other Events (At Risk) |
|---|---|---|---|---|---|---|---|---|
| EG000 | Telcagepant and [11C]MK-4232 (Part I): Healthy Participants | Baseline PET imaging of the brain using [11C]MK-4232 tracer (~300 MBq) was performed in healthy participants; this PET data served as the baseline for both Period 1 and 2 of Part I. Subsequently in study Part I, Period 1 the healthy participants received a single 1120 mg dose of telcagepant followed by PET imaging of brain with [11C]MK-4232 tracer (~300 MBq) beginning ~3 hours post telcagepant dose. In Part I, Period 2 the healthy participants received a single 140 mg dose of telcagepant followed by PET imaging of brain with [11C]MK-4232 tracer (~300 MBq) beginning ~2 hours post telcagepant dose. | 0 | 6 | 4 | 6 | ||
| EG001 | Telcagepant and [11C]MK-4232 (Part III): Migraineurs | In study Part III, Period 1 baseline PET imaging of the brain using [11C]MK-4232 tracer (~300 MBq) was performed in participants with migraine during a migraine attack (ictal phase). Later in Part III, Period 1 the participants with an ongoing migraine attack (ictal phase) received a single 140 mg dose of telcagepant followed by PET imaging of brain with [11C]MK-4232 tracer (~300 MBq) beginning ~2 hours post telcagepant dose. In Part III, Period 2 baseline PET imaging of the brain using [11C]MK-4232 tracer (~300 MBq) was performed in participants with migraine, however, without a migraine attack ongoing (interictal phase). Later in Part III, Period 2 participants with migraine without a migraine attack ongoing (interictal phase) received a single 140 mg dose of telcagepant followed by PET imaging of brain with [11C]MK-4232 tracer (~300 MBq) beginning ~2 hours post telcagepant dose. | 0 | 4 | 4 | 4 |
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| Term | Organ System | Source Vocabulary | Assessment Type | Notes | Statistical Information |
|---|---|---|---|---|---|
| Sinus tachycardia | Cardiac disorders | MedDRA 14.1 | Systematic Assessment |
| |
| Eye pruritus | Eye disorders | MedDRA 14.1 | Systematic Assessment |
| |
| Ocular hyperaemia | Eye disorders | MedDRA 14.1 | Systematic Assessment |
| |
| Abdominal pain upper | Gastrointestinal disorders | MedDRA 14.1 | Systematic Assessment |
| |
| General physical health deterioration | General disorders | MedDRA 14.1 | Systematic Assessment |
| |
| Cystitis | Infections and infestations | MedDRA 14.1 | Systematic Assessment |
| |
| Nasopharyngitis | Infections and infestations | MedDRA 14.1 | Systematic Assessment |
| |
| Blood urine present | Investigations | MedDRA 14.1 | Systematic Assessment |
| |
| White blood cells urine positive | Investigations | MedDRA 14.1 | Systematic Assessment |
| |
| Back pain | Musculoskeletal and connective tissue disorders | MedDRA 14.1 | Systematic Assessment |
| |
| Headache | Nervous system disorders | MedDRA 14.1 | Systematic Assessment |
| |
| Migraine | Nervous system disorders | MedDRA 14.1 | Systematic Assessment |
| |
| Presyncope | Nervous system disorders | MedDRA 14.1 | Systematic Assessment |
| |
| Insomnia | Psychiatric disorders | MedDRA 14.1 | Systematic Assessment |
| |
| Dysphonia | Respiratory, thoracic and mediastinal disorders | MedDRA 14.1 | Systematic Assessment |
| |
| Ecchymosis | Skin and subcutaneous tissue disorders | MedDRA 14.1 | Systematic Assessment |
|
The Sponsor must have the opportunity to review all proposed abstracts, manuscripts, or presentations regarding this study 60 days prior to submission for publication/presentation. Any information identified by the Sponsor as confidential must be deleted prior to submission. Sponsor review can be expedited to meet publication timelines.
| Title | Organization | Phone | Extension | |
|---|---|---|---|---|
| Senior Vice President, Global Clinical Development | Merck Sharp & Dohme Corp. | 1-800-672-6372 | ClinicalTrialsDisclosure@merck.com |
| ID | Term |
|---|---|
| D008881 | Migraine Disorders |
| ID | Term |
|---|---|
| D051270 | Headache Disorders, Primary |
| D020773 | Headache Disorders |
| D001927 | Brain Diseases |
| D002493 | Central Nervous System Diseases |
| D009422 | Nervous System Diseases |
Not provided
Not provided
| ID | Term |
|---|---|
| C525458 | telcagepant |
Not provided
Not provided
Not provided
| Male |
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| Participants |
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| Participants |
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