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

Impel Pharmaceuticals32 enrolled

Overview

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

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 Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

QUADRUPLE

Enrollment

Conditions

Parkinson's Disease

Interventions

PlaceboCOMBINATION_PRODUCT

Delivered via the I231 POD (Precision Olfactory Delivery) device

L-dopa 35 mgCOMBINATION_PRODUCT

Delivered via the I231 POD (Precision Olfactory Delivery) device via one puff to one nostril

L-dopa 70mgCOMBINATION_PRODUCT

Delivered via the I231 POD (Precision Olfactory Delivery) device with two puffs, one to each nostril

Eligibility

Sex: ALLMin age: 40 YearsMax age: 80 Years

Medical Language ↔ Plain English

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

Locations (5)

The Brain and Mind Centre / Scientia Clinical Research

Sydney, New South Wales, Australia

Q-Pharm

Brisbane, Queensland, Australia

The Mater Hospital

Brisbane, Queensland, Australia

The Alfred Hospital

Melbourne, Victoria, Australia

Outcomes

Primary Outcomes

Number of Participants With Treatment Emergent Adverse Events

Assessment of treatment emergent adverse events after single dosing with INP103 (L-dopa or L-dopa/carbidopa)

Time frame: 7 days

Secondary Outcomes

AUC0-2hr for L-dopa

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.

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

Cmax of L-dopa

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.

Tmax of L-dopa

Time to Reach the Maximum Plasma Concentration (Cmax) of L-dopa

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

Data from ClinicalTrials.gov

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Delivered via the I231 POD (Precision Olfactory Delivery) device with four puffs, two to each nostril

L-dopa 70mg/carbidopa 7mgCOMBINATION_PRODUCT

Delivered via the I231 POD (Precision Olfactory Delivery) device with two puffs, one to each nostril

Perth, Western Australia, Australia

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.

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.

Time to Response (Defined as Improvement of 30% in MDS-UPDRS Part III Score From Baseline)

Time frame: 2 hours

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

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.

Mean Maximum Change From Baseline in MDS-UPDRS Part III Score

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.

Time frame: From time = 0 to 2 hours post-dose

Subjective Time to "ON" as Evaluated by the Investigator

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".

Time frame: 4 hours

Assessment of Time to "ON" as Evaluated by Subject Self-assessment

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".

Time frame: 4 hours

AUC0-2h for Carbidopa

Area under the concentration time curve 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.

Cmax of Carbidopa

Maximum concentration 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.

Tmax of Carbidopa

Time to reach the maximum concentration 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.

Duration of Response, Where Response is Defined as an Improvement of 30% in MDS-UPDRS Part III Score From Baseline.

Time frame: 2 hours