Extension Study To Evaluate Safety And Tolerability Of 24-Hour Daily Exposure Of Continuous Subcutaneous Infusion of ABBV-951 In Adult Participants With Parkinson's Disease

Phase 3

Active, not recruiting

• Conditions: Parkinson's Disease (PD)
• Interventions: Drug: ABBV-951

• Registration Number: NCT04379050
• Lead Sponsor: AbbVie

Brief Summary

Parkinson's disease (PD) is a neurological condition, which affects the brain. PD gets worse over time, but how quickly it progresses varies a lot from person to person. Some symptoms of PD are tremors, stiffness, and slowness of movement. The purpose of this study is to continue testing whether ABBV-951 is safe, effective, and tolerable in participants with Parkinson's disease after completion of the parent study M15-741.

ABBV-951 is an investigational (unapproved) drug containing levodopa phosphate/carbidopa phosphate (LDP/CDP) given as infusion under the skin for the treatment of Parkinson's Disease. Participants who have successfully completed M15-741 study will immediately enter this study's treatment period to continue receiving ABBV-951. Adult participants with advanced PD will be enrolled. Approximately 130 adult participants will be enrolled in the study at approximately 65 sites worldwide.

Participants will receive continuous subcutaneous infusion (CSCI) of ABBV-951 for 24 hours daily during the Primary Treatment Period and during the optional Extended Treatment Period.

There may be higher treatment burden for participants in this trial compared to their standard of care. Participants will attend regular clinic visits and have remote assessments completed via phone calls during the course of the study. The effect of the treatment will be checked by medical assessments, blood tests, checking for side effects, and completing questionnaires.

Detailed Description

Not available

Study Timeline

• Study First Submitted: 2020-05-01
• Study First Submitted QC: 2020-05-06
• Study First Posted: 2020-05-07
• Study Start: 2020-06-08
• Status Verified: 2025-08
• Last Update Submitted: 2025-08-01
• Last Update Posted: 2025-08-05
• Primary Completion: 2026-04
• Study Completion: 2026-04-01

Recruitment & Eligibility

• Status: ACTIVE_NOT_RECRUITING
• Sex: All
• Target Recruitment: 130

Inclusion Criteria

• Participants who have Parkinson's Disease and who have successfully completed the parent study M15-741.
• Participants willing and able to comply with procedures required in the protocol.

Exclusion Criteria

• Participants, if judged by the investigator to be unsuitable candidates to continue to receive ABBV-951 for any reason.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
ABBV-951	ABBV-951	Participants will receive ABBV-951 solution by continuous subcutaneous infusion (CSCI), at the discretion of the investigator, for up to 96 weeks.

Primary Outcome Measures

Name	Time	Method
Percentage of Participants With Adverse Events (AE)	Up To Week 96	An AE is defined as any untoward medical occurrence in a participant or clinical investigation participant administered a pharmaceutical product and which does not necessarily have a causal relationship with the treatment. The investigator assesses the relationship of each event to the use of the study drug or device as either reasonable possibility or no reasonable possibility. A serious adverse event (SAE) is an event that results in death, is life-threatening, requires or prolongs hospitalization, results in a congenital anomaly, persistent or significant disability/incapacity or is an important medical event that, based on medical judgment, may jeopardize the participant and may require medical or surgical intervention to prevent any of the outcomes listed above. Adverse Events of Special Interest (AESI) - polyneuropathy, weight loss, hallucinations/psychosis, and somnolence will be monitored throughout the study.
Percentage Of Participants With Numeric Grade Equal To Or Higher Than 5 On The Infusion Site Evaluation Scale	Up To Week 96	The Infusion Site Evaluation Scale will be used to assess infusion sites. Infusion Site Evaluation Scale is an eight-point numeric scale used to assess irritation at the infusion site area (0 being "no evidence of irritation" and 7 being "strong reaction spreading beyond the test site").
Change in Vital Signs Measurements	Up To Week 96	Number of participants with clinically significant change from baseline in vital signs will be reported throughout the study.
Change From Baseline in Electrocardiograms (ECGs)	Up To Week 96	Change from baseline in 12-lead ECGs on heart rate, RR interval, PR interval, QRS duration, and QT interval will be monitored throughout the study.
Change in Clinical Laboratory Test Data	Up To Week 96	Number of participants with clinically significant change from baseline in laboratory parameters (hematology, biochemistry, coagulation, and urinalysis) will be reported throughout the study.
Percentage Of Participants With Letter Grade Equal To Or Higher Than D On The Infusion Site Evaluation Scale	Up To Week 96	The Infusion Site Evaluation Scale will be used to assess infusion sites. Infusion Site Evaluation Scale is an A to G letter grade scale, used to assess irritation at the infusion site area (A being "no finding" to G being "Small petechial erosions and/or scabs").

Secondary Outcome Measures

Name	Time	Method
Average Normalized Daily "On" Time	Up To Week 96	Average normalized daily "On" time is assessed based on Parkinson's Disease (PD) Diary.
Parkinson's Disease (PD) Symptoms Measurement	Up To Week 96	PD symptoms will be assessed by the Movement Disorder Society-Unified Parkinson's Disease Rating Scale (MDS-UPDRS) Parts I-IV.; The MDS-UPDRS is an investigator-used rating tool to follow the longitudinal course of Parkinson's Disease (PD) with scores ranging from 0 to 236 with 236 representing the worst disability, and 0 representing no disability.
Change From Baseline in Quality Of Life Measurement as Assessed by PD Questionnaire-39 (PDQ-39)	Up To Week 96	Quality of life is assessed by the PD Questionnaire-39 items (PDQ-39). PDQ-39 is a disease-specific instrument designed to measure aspects of health that are relevant to participants with PD, and which may not be included in general health status questionnaires.; Each item is scored on a 5-point scale.
Average Normalized Daily "Off" Time	Up To Week 96	Average normalized daily "Off" Time (Hours) is assessed based on Parkinson's Disease (PD) Diary.
Change From Baseline in Health-related Quality Of Life Measurement as Assessed by EuroQol 5-dimensions questionnaire (EQ-5D-5L)	Up To Week 96	Health-related quality of life is assessed by the EuroQol 5-dimensions questionnaire (EQ-5D-5L).; EQ-5D-5L is a standardized instrument that consists of 2 parts: the EQ-5D descriptive system and the EQ visual analogue-scale (EQVAS).
Cognitive Impairment Measurement	Up To Week 96	Cognitive impairment is assessed by the Mini-Mental State Examination (MMSE). MMSE is used to assess orientation, attention, immediate and short term recall, language, and ability to follow simple verbal and written commands. The test consists of five sections (orientation, registration, attention-calculation, recall, and language) and results in a total possible score of 0 to 30, with higher scores indicating better function.

Trial Locations

Locations (51)

Duplicate_Royal Adelaide Hospital /ID# 215940; 🇦🇺 Adelaide, South Australia, Australia

Duplicate_Algemeen Ziekenhuis Sint-Jan Brugge /ID# 215686; 🇧🇪 Brugge, West-Vlaanderen, Belgium

Duplicate_Groupe Sante CHC - Clinique du MontLegia /ID# 215685; 🇧🇪 Liege, Belgium

University of Calgary /ID# 215369; 🇨🇦 Calgary, Alberta, Canada

Azienda Ospedale-Universita Padova /ID# 215421; 🇮🇹 Padova, Italy

Duplicate_Osaka University Hospital /ID# 217415; 🇯🇵 Suita-shi, Osaka, Japan

University of Alabama at Birmingham - Main /ID# 215597; 🇺🇸 Birmingham, Alabama, United States

Banner Sun Health Research Institute /ID# 215579; 🇺🇸 Sun City, Arizona, United States

University of Colorado Hospital /ID# 215625; 🇺🇸 Aurora, Colorado, United States

Parkinson's Disease and Movement Disorders Center of Boca Raton /ID# 215412; 🇺🇸 Boca Raton, Florida, United States

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