Therapeutic Potential for Intranasal Levodopa in Parkinson's Disease -Off Reversal (THOR201)

• ClinicalTrials.gov Identifier: NCT03541356
• Recruitment Status: Completed
• First Posted: May 30, 2018
• Results First Posted: August 12, 2020
• Last Update Posted: August 12, 2020
• Sponsor: Impel NeuroPharma Inc.
• Information provided by (Responsible Party): Impel NeuroPharma Inc.

Study Description

Brief Summary:

A Phase IIa, Randomized, Double Blind, Placebo Controlled, Single Dose, Safety and Pharmacokinetic/Pharmacodynamic Study of INP103 (POD L-dopa) Administered in the Presence of Decarboxylase Inhibitor to L-dopa Responsive Parkinson's Disease Patients

Condition or disease	Intervention/treatment	Phase
Parkinson's Disease	Combination Product: Placebo; Combination Product: L-dopa 35 mg; Combination Product: L-dopa 70mg; Combination Product: L-dopa 140 mg; Combination Product: L-dopa 70mg/carbidopa 7mg	Phase 2

Detailed Description:

This is a Phase IIa randomized, double-blind, placebo-controlled, single dose study to compare the safety, tolerability and PK/PDyn of intranasal L-dopa following administration of INP103 in the presence of L-dopa decarboxylase inhibitor (DCI) during an OFF episode.

Study Design

• Study Type: Interventional (Clinical Trial)
• Actual Enrollment: 32 participants
• Allocation: Randomized
• Intervention Model: Sequential Assignment

Intervention Model Description

Thirty-Two (32) to Thirty-Six (36) subjects will be randomized to treatment or placebo. INP103 is a drug-device combination product containing a drug component, L-dopa, and device component, the I231 Precision Olfactory Delivery (POD) device. In Cohorts 1, 2, and 3, L-dopa will be administered intranasally in single doses of one (35 mg), two (70 mg) or four (140 mg) puffs of INP103, 60 minutes after oral benserazide hydrochloride 25 mg.

In Cohort 4 the INP103 formulation will contain L-dopa:carbidopa administered nasally. Dosing will take place once OFF episode is confirmed and will not include predosing with oral benserazide.

• Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
• Masking Description: Double blind
• Primary Purpose: Treatment
• Official Title: A Phase IIa, Randomized, Double Blind, Placebo Controlled, Single Ascending Dose, Safety and Pharmacokinetic/Pharmacodynamic Study of INP103 (POD L-dopa) Administered in the Presence of DCI to L-dopa Responsive Parkinson's Disease Patients
• Actual Study Start Date: May 8, 2018
• Actual Primary Completion Date: June 11, 2019
• Actual Study Completion Date: June 11, 2019

Arms and Interventions

Arm	Intervention/treatment
Placebo Comparator: Placebo	Combination Product: Placebo; Delivered via the I231 POD (Precision Olfactory Delivery) device
Active Comparator: L-dopa 35 mg	Combination Product: L-dopa 35 mg; Delivered via the I231 POD (Precision Olfactory Delivery) device via one puff to one nostril
Active Comparator: L-dopa 70 mg	Combination Product: L-dopa 70mg; Delivered via the I231 POD (Precision Olfactory Delivery) device with two puffs, one to each nostril
Active Comparator: L-dopa 140 mg	Combination Product: L-dopa 140 mg; Delivered via the I231 POD (Precision Olfactory Delivery) device with four puffs, two to each nostril
Active Comparator: L-dopa 70 mg/carbidopa 7 mg	Combination Product: L-dopa 70mg/carbidopa 7mg; Delivered via the I231 POD (Precision Olfactory Delivery) device with two puffs, one to each nostril

Outcome Measures

Primary Outcome Measures :

1. Number of Participants With Treatment Emergent Adverse Events [ Time Frame: 7 days ]
   Assessment of treatment emergent adverse events after single dosing with INP103 (L-dopa or L-dopa/carbidopa)

Secondary Outcome Measures :

1. AUC0-2hr for L-dopa [ Time Frame: For L-dopa 35 mg, 70 mg, 140 mg plasma samples were taken at pre-dose, 30, 60, 90 and 120 minutes post-dose. For L-dopa 70 mg/carbidopa 7 mg, plasma samples were taken at pre-dose, 5, 10, 15, 30, 45, 60, 90 and 120 min ]
   Area under the Plasma Concentration-time Curve for L-dopa from Time = 0 to Time = 2 hours post dose. For the L-dopa 35 mg, L-dopa 70 mg, L-dopa 140 mg plasma samples were taken at pre-dose, 30, 60, 90 and 120 minutes post-dose. For the L-dopa 70 mg/carbidopa 7 mg treatment arm, plasma samples were taken at pre-dose, 5, 10, 15, 30, 45, 60, 90 and 120 minutes post-dose.
2. Cmax of L-dopa [ Time Frame: For L-dopa 35 mg, 70 mg, 140 mg plasma samples were taken at pre-dose, 30, 60, 90 and 120 minutes post-dose. For L-dopa 70 mg/carbidopa 7 mg, plasma samples were taken at pre-dose, 5, 10, 15, 30, 45, 60, 90 and 120 minutes post-dose. ]
   Maximum Observed Plasma Concentration of L-dopa from Time = 0 to Time = 2 hours post dose. For the L-dopa 35 mg, L-dopa 70 mg, L-dopa 140 mg plasma samples were taken at pre-dose, 30, 60, 90 and 120 minutes post-dose. For the L-dopa 70 mg/carbidopa 7 mg treatment arm, plasma samples were taken at pre-dose, 5, 10, 15, 30, 45, 60, 90 and 120 minutes post-dose.
3. Tmax of L-dopa [ Time Frame: For L-dopa 35 mg, 70 mg, 140 mg plasma samples were taken at pre-dose, 30, 60, 90 and 120 minutes post-dose. For L-dopa 70 mg/carbidopa 7 mg, plasma samples were taken at pre-dose, 5, 10, 15, 30, 45, 60, 90 and 120 minutes post-dose. ]
   Time to Reach the Maximum Plasma Concentration (Cmax) of L-dopa
4. Mean Change From Baseline in MDS-UPDRS Score Over 2 Hours for C1, C2, C3 and Change From Baseline at 30, 60, 90, 120 Minutes for C4, in MDS-UPDRS Part III Score [ Time Frame: For L-dopa 35 mg, 70 mg, 140 mg, assessment occurred at pre-dose, 15, 30, 45, 60, 90 and 120 minutes post-dose. For L-dopa 70 mg/carbidopa 7 mg, assessment occurred at pre-dose, 30, 60, 90 and 120 minutes post-dose. ]
   MDS-UPDRS is a clinimetric assessment of subjective and objective symptoms and signs of Parkinson's disease created by the Movement Disorder Society with high internal consistency. MDS-UPDRS retains the four-scale structure with a reorganization of the various subscales. The subscale used in this study is Part III, motor examination (18 items). The subscale has 0-4 ratings, where 0 = normal, 1 = slight, 2 = mild, 3 = moderate, and 4 = severe. Maximum score is 132, minimum is zero. High score means worse outcome. For the L-dopa 35 mg, L-dopa 70 mg, L-dopa 140 mg treatment groups, assessment occurred at pre-dose, 15, 30, 45, 60, 90 and 120 minutes post-dose. For the L-dopa 70 mg/carbidopa 7 mg treatment arm, assessment occurred at pre-dose, 30, 60, 90 and 120 minutes post-dose.
5. Time to Response (Defined as Improvement of 30% in MDS-UPDRS Part III Score From Baseline) [ Time Frame: 2 hours ]
   MDS-UPDRS is a clinimetric assessment of subjective and objective symptoms and signs of Parkinson's disease created by the Movement Disorder Society with high internal consistency. MDS-UPDRS retains the four-scale structure with a reorganization of the various subscales. The subscale used in this study is Part III, motor examination (18 items). The subscale now has 0-4 ratings, where 0 = normal, 1 = slight, 2 = mild, 3 = moderate, and 4 = severe.
6. Cumulative Number of Responders (Defined as Improvement of 30% in MDS-UPDRS Part III Score From Baseline) [ Time Frame: From time = 0 to 2 hours post-dose ]
   MDS-UPDRS is a clinimetric assessment of subjective and objective symptoms and signs of Parkinson's disease created by the Movement Disorder Society with high internal consistency. MDS-UPDRS retains the four-scale structure with a reorganization of the various subscales. The subscale used in this study is Part III, motor examination (18 items). The subscale now has 0-4 ratings, where 0 = normal, 1 = slight, 2 = mild, 3 = moderate, and 4 = severe.
7. Area Under the Curve (AUC) of Change From Baseline in MDS-UPDRS Part III Scores [ Time Frame: For L-dopa 35 mg, 70 mg, 140 mg, assessments were made at pre-dose, 15, 30, 45, 60, 90, 120 minutes post-dose. For L-dopa 70 mg/carbidopa 7 mg, assessments were made at pre-dose, 50, 60, 90, 120 minutes post-dose. ]
   MDS-UPDRS is a clinimetric assessment of subjective and objective symptoms and signs of Parkinson's disease created by the Movement Disorder Society with high internal consistency. MDS-UPDRS retains the four-scale structure with a reorganization of the various subscales. The subscale used in this study is Part III, motor examination (18 items). The subscale now has 0-4 ratings, where 0 = normal, 1 = slight, 2 = mild, 3 = moderate, and 4 = severe.
8. Mean Maximum Change From Baseline in MDS-UPDRS Part III Score [ Time Frame: From time = 0 to 2 hours post-dose ]
   MDS-UPDRS is a clinimetric assessment of subjective and objective symptoms and signs of Parkinson's disease created by the Movement Disorder Society with high internal consistency. MDS-UPDRS retains the four-scale structure with a reorganization of the various subscales. The subscale used in this study is Part III, motor examination (18 items). The subscale now has 0-4 ratings, where 0 = normal, 1 = slight, 2 = mild, 3 = moderate, and 4 = severe. The total of the subscales has a maximum value of 132 and a minimum value of zero. Lower scores indicate better motor function. A negative change from baseline indicates improved motor function.
9. Subjective Time to "ON" as Evaluated by the Investigator [ Time Frame: 4 hours ]
   Investigators will evaluate subjects' fluctuations in motor functions at 15, 30, 45, 60, 90, 120, and 240 minutes post-dose to determine if they are "ON".
10. Assessment of Time to "ON" as Evaluated by Subject Self-assessment [ Time Frame: 4 hours ]
    Subjects were asked to provide self-assessments at 15, 30, 45, 60, 90, 120, and 240 minutes post-dose as to whether they considered themselves to be "ON".
11. AUC0-2h for Carbidopa [ Time Frame: Plasma samples were taken at pre-dose, 5, 10, 15, 30, 45, 60, 90 and 120 minutes post-dose and AUC calculated from these from time 0 to 120 minutes. ]
    Area under the concentration time curve for carbidopa
12. Cmax of Carbidopa [ Time Frame: For L-dopa 70 mg/carbidopa 7 mg, plasma samples were taken at pre-dose, 5, 10, 15, 30, 45, 60, 90 and 120 minutes post-dose. ]
    Maximum concentration of carbidopa
13. Tmax of Carbidopa [ Time Frame: For L-dopa 70 mg/carbidopa 7 mg, plasma samples were taken at pre-dose, 5, 10, 15, 30, 45, 60, 90 and 120 minutes post-dose. ]
    Time to reach the maximum concentration of carbidopa
14. Duration of Response, Where Response is Defined as an Improvement of 30% in MDS-UPDRS Part III Score From Baseline. [ Time Frame: 2 hours ]
    MDS-UPDRS is a clinimetric assessment of subjective and objective symptoms and signs of Parkinson's disease created by the Movement Disorder Society with high internal consistency. MDS-UPDRS retains the four-scale structure with a reorganization of the various subscales. The subscale used in this study is Part III, motor examination (18 items). The subscale has 0-4 ratings, where 0 = normal, 1 = slight, 2 = mild, 3 = moderate, and 4 = severe. Maximum score is 132, minimum is zero. High score means worse outcome.

Eligibility Criteria

• Ages Eligible for Study: 40 Years to 80 Years (Adult, Older Adult)
• Sexes Eligible for Study: All
• Accepts Healthy Volunteers: No

Criteria

Inclusion Criteria:

1. Adult males and females, 40 to 80 years of age (inclusive) at the time of Screening (Visit1)
2. Diagnosed with Idiopathic PD (by UK Brain Bank Criteria) with Modified Hoehn & Yahr (H&Y) Stage I-III during an ON period at Visit 1
3. Subjects who are prone to (and recognize) OFF episodes (when their usual PD medication has worn off)
4. Shown to be responsive to L-dopa medication (≥ 30% improvement in MDS-UPDRS Part III Motor Examination score) as assessed during the Screening period (Visit 2)
5. On a stable dose of L-dopa containing medication for at least 2 weeks prior to Visit 1 (up to 1200 mg/day) with no single dose exceeding 250 mg. All other anti-PD medication (e.g. dopamine agonists [DAs], monoamine oxidase-B inhibitor (MAOB-I) or catechol-O-methyl transferase (COMT) inhibitors ARE allowed if the subject has been on a stable dose for at least 30 days prior to Visit 1.

6. Willing to omit their (usual) PD drugs (e.g. usual regular anti-PD medication including any L-dopa containing medication, DAs and/or COMT inhibitors and any required anti-OFF treatment) from 22:00 pm the evening prior to study dosing until 120 minutes post study treatment dosing.

   Cohorts 1, 2 and 3 ONLY WILL take oral benserazide 25 mg on arrival at the research site (at 60 ± 5 minutes before dosing with INP103 or placebo).

   Cohort 4 will omit oral benserazide and subjects may be dosed once OFF episode has been confirmed and all baseline assessments have been completed.

7. If female and of childbearing potential must agree to use adequate contraception (see Section 4.4) during the study
8. Able and willing to attend the necessary visits at the study centre
9. Willing to provide voluntary written informed consent signed prior to entry into the study

Exclusion Criteria:

1. Severe dyskinesia (defined as per MDS-UPDRS) during a 'normal day' that would significantly interfere with the subject's ability to perform study assessments
2. In receipt of L-dopa containing medication at > 1200 mg/day
3. History of significant psychotic episode(s) within the previous 12 months in the opinion of the Investigator, or currently receiving anti-psychotic medication at a moderate dose (quetiapine >50 mg/day, risperidone >1 mg/day or olanzapine >2.5 mg/day)
4. Mini Mental State Examination (MMSE) ≤ 25 as documented within the previous 36 months or as assessed by Investigator during Screening
5. History of suicidal ideation or attempted suicide within previous 12 months
6. Narrow-angle glaucoma
7. Presence of skin lesions that, in the opinion of the Investigator, may be cancerous
8. Females who are pregnant, planning a pregnancy or lactating
9. Subjects with any underlying physical condition that, in the opinion of the Investigator, would make it unlikely that the subject will comply with or be able to complete the study requirements
10. Use of any medication likely to interact with benserazide, carbidopa or INP103 (see Appendix 5)
11. Laboratory test abnormalities at Screening (Visit 1) deemed clinically significant by the Investigator.
12. History or presence of alcoholism or drug abuse within the 2 years prior to INP103 or placebo dosing
13. Administration of an investigational product in another trial within 30 days or 5 half-lives (whichever is longer) prior to INP103 or placebo dosing
14. Significant nasal congestion, physical blockage in either nostril, or significantly deviated nasal septum as evaluated by the PI or other suitably trained healthcare professional
15. Subjects who have previously shown hypersensitivity to L-dopa or benserazide (for Cohorts 1, 2 and 3), or L-dopa or carbidopa (for Cohort 4) or any of their excipients

Contacts and Locations

Locations

Australia, New South Wales

The Brain and Mind Centre / Scientia Clinical Research

Sydney, New South Wales, Australia, 2031

Australia, Queensland

Q-Pharm

Brisbane, Queensland, Australia

The Mater Hospital

Brisbane, Queensland, Australia

Australia, Victoria

The Alfred Hospital

Melbourne, Victoria, Australia

Australia, Western Australia

Perron Institute

Perth, Western Australia, Australia, 6009

Sponsors and Collaborators

Impel NeuroPharma Inc.

Investigators

• Study Chair: Stephen B Shrewsbury, MD; Impel NeuroPharma, Seattle, WA (USA)
• Principal Investigator: Terry O'Brien, MD/Prof; The Alfred Hospital, Melbourne, VIC (AUS)

  Study Documents (Full-Text)

Documents provided by Impel NeuroPharma Inc.:

Study Protocol  [PDF] February 1, 2019

Statistical Analysis Plan  [PDF] June 10, 2019

More Information

• Responsible Party: Impel NeuroPharma Inc.
• ClinicalTrials.gov Identifier: NCT03541356
• Other Study ID Numbers: INP103-201
• First Posted: May 30, 2018
• Results First Posted: August 12, 2020
• Last Update Posted: August 12, 2020
• Last Verified: July 2020

Individual Participant Data (IPD) Sharing Statement:

• Plan to Share IPD: No

• Studies a U.S. FDA-regulated Drug Product: Yes
• Studies a U.S. FDA-regulated Device Product: Yes
• Device Product Not Approved or Cleared by U.S. FDA: Yes
• Product Manufactured in and Exported from the U.S.: Yes

Keywords provided by Impel NeuroPharma Inc.:

Parkinsons; L-dopa; levodopa; ON; OFF; PD; POD device; I231; benserazide; Precision olfactory delivery; MDS-UPDRS; Carbidopa; DCI; Decarboxylase Inhibitor

Additional relevant MeSH terms:

Parkinson Disease; Parkinsonian Disorders; Basal Ganglia Diseases; Brain Diseases; Central Nervous System Diseases; Nervous System Diseases; Movement Disorders; Neurodegenerative Diseases; Carbidopa; Levodopa; Dihydroxyphenylalanine; Antiparkinson Agents; Anti-Dyskinesia Agents; Dopamine Agents; Neurotransmitter Agents; Molecular Mechanisms of Pharmacological Action; Physiological Effects of Drugs; Aromatic Amino Acid Decarboxylase Inhibitors; Enzyme Inhibitors