Inclusion Criteria:

Subjects who satisfy all of the following criteria will be eligible for Part A (Genetic Screening) of the study:

• The subject is ≥ 35 and ≤ 80 years of age at the time of informed consent.
• The subject has a clinical diagnosis of PD for at least 1 year and for no longer than 7 years before initiation of screening (for Part A), as confirmed by a neurologist using the MDS Criteria for Parkinson's Disease.
• The subject has a modified Hoehn and Yahr score ≤ 2.5.
• The subject is receiving symptomatic treatment for PD.
• The subject is capable of giving signed informed consent.

Subjects who satisfy all the following criteria will be eligible for Part B (Double-Blind Treatment) of the study:

• Informed Consent - The subject is capable of giving signed informed consent.
• The subject has a known GBA-PD risk-associated variant (as determined in Part A [Genetic Screening] of this study).
• The subject has a score ≥ 22 on the Montreal Cognitive Assessment (MoCA) scale.
• The subject does not have severe motor fluctuations or disabling dyskinesias in the clinical judgment of the investigator.
• The subject has been on stable doses of PD medications for at least 30 days (at least 60 days for rasagiline) before initiation of screening in Part B (Double-Blind Treatment).
• The subject is able to comply with the study restrictions.
• The subject has a body mass index (BMI) of 18 to 40 kg/m^2.
• If a sexually active man or a women of childbearing potential, the subject agrees to use highly effective birth control or to remain abstinent during the trial and for 30 days after the last dose of IMP. Complete abstinence from sexual intercourse if this is the subject's usual and preferred lifestyle; or sexual partner with surgical sterilization (e.g., tubal ligation, hysterectomy and/or bilateral oophorectomy, vasectomy).
• The subject does not have clinically significant psychosis in the clinical judgment of the investigator.

Exclusion Criteria:

Individuals who do not satisfy the inclusion criteria for Part A (Genetic Screening) will be excluded.

Subjects who meet any of the following criteria for Part B (Double-Blind Treatment) are not eligible for the study.

• The subject has Gaucher's disease (GD), as defined by clinical signs and symptoms (i.e., hepatosplenomegaly, cytopenia, skeletal disease), and/or a medical history of marked deficiency of GCase activity compatible with GD.
• The subject is homozygous for a GBA1 pathogenic variant that is known to be associated with GD or compound heterozygous for 2 alleles that are known to be associated with GD.
• The subject carries a known PD-associated LRRK2 pathogenic variant.
• The subject has atypical or secondary parkinsonism by medical history or in the opinion of the investigator. Atypical parkinsonism includes, but is not limited to, diagnoses of progressive supranuclear palsy, cortico-basal syndrome, and multiple system atrophy. Secondary parkinsonism includes drug-induced, toxin-induced, postinfectious, posttraumatic, or vascular parkinsonism.
• The subject has a history of (within 60 days before initiation of screening) or has planned upcoming major surgery that could interfere with, or for which the treatment might interfere with, the conduct of the study or that would pose an unacceptable risk to the subject in the opinion of the investigator.
• The subject has any active or chronic disease or condition other than PD that could interfere with, or for which the treatment might interfere with, the conduct of the study or pose an unacceptable risk to the subject in the opinion of the investigator based on medical history, physical examination, vital signs, 12-lead ECG, or clinical laboratory tests. Minor deviations of laboratory values from the normal range may be acceptable if judged by the investigator to have no/minor clinical relevance.
• The subject has a recent history (last 6 months) of abuse of addictive substances (alcohol, illegal substances), currently uses >21 units of alcohol per week, or is a regular recreational user of sedatives, hypnotics, tranquillizers, or any other addictive agent in the opinion of the investigator.
• The subject has a positive test for drugs of abuse at screening or before administration of the first dose of IMP that the investigator judges as clinically relevant. Use of cannabinoids is not exclusionary if the subject agrees to abstain from using cannabinoids within 12 hours before study visits. A positive drug screen that is attributed to an allowed prescription, including medicines containing THC, or overthe-counter (OTC) drug is not exclusionary but should be agreed with the medical monitor.
• The subject is currently pregnant, is planning pregnancy within the timeframe of the study, or is breastfeeding.
• The subject is using a strong inhibitors and inducers CYP3A4 at the time of screening for Part B (Double-Blind Treatment).
• The subject is using a breast cancer resistance protein (BCRP) substrate (e.g., pravastatin, rosuvastatin, glyburide) at the time of screening for Part B (Double-Blind Treatment).
• The subject has used any of the following medications within 60 days before Baseline: typical or atypical antipsychotics (including, but not limited to, clozapine, pimavanserin, olanzapine, quetiapine, risperidone, and aripiprazole); metoclopramide; prochlorperazine; methyldopa; tetrabenazine; deutetrabenazine; valbenazine; or reserpine or a prior history or continuation or initiation during the study of ambroxol at doses >120 mg/day.
• The subject has received a vaccination within 14 days before administration of the first dose of IMP.
• The subject has a prior history of or there is a plan to conduct deep brain stimulation (DBS), lesional procedures, (i.e., thalamotomy), or focused ultrasound; to initiate gene therapy treatment for PD; or to initiate use of any formulation of intestinal infusion or continuous subcutaneous infusion of PD medications.
• The subject is currently participating in or has participated in an investigational drug study within 3 months or 5 half-lives, whichever is longer; in a therapeutic device study within 3 months before the first dose of IMP; or has previously participated in a gene therapy trial. Concurrent participation in an observational study is acceptable.
• The subject has a positive test result for hepatitis B surface antigen (HBsAg), hepatitis C virus antibody (anti-HCV), or human immunodeficiency virus 1 (HIV-1) or 2 (HIV-2) at screening. If reflex testing for hepatitis B or HCV DNA is negative, the subject may be eligible for the study.
• The subject has renal insufficiency as defined by an estimated glomerular filtration rate (eGFR) of < 60 mL/min at screening.
• The subject has cirrhosis (Child-Pugh A, B, or C) or any of the following laboratory values at screening: serum alanine aminotransferase (ALT) or aspartate aminotransferase (AST) > 2 times the upper limit of normal (ULN) or bilirubin > 2 × ULN except if the subject has known or suspected Gilbert's disease.
• The subject has a QT interval corrected for heart rate by Fridericia's method (QTcF) value > 450 msec if male or >470 msec if female at screening.
• The subject provides a positive response on Question 4 or 5 of the Columbia-Suicide Severity Rating Scale (C-SSRS) based on the last 6 months or, in the opinion of the investigator, presents a serious risk of suicide at screening.
• The subject had a positive severe acute respiratory syndrome-related coronavirus-2 (SARS-CoV-2) test (any type) result within the 30 days before signing informed consent for Part B (Double-Blind Treatment) or has 2 or more current symptoms (e.g., sore throat, cough, fever) at the same time that are consistent with the Coronavirus disease 2019 (COVID-19) infection (not tested) in the opinion of the investigator.
• The subject has a clinical history that is consistent with a previous COVID-19 infection and has not recovered fully, maintaining nonspecific symptoms like, for example, fatigue, shortness of breath, difficulty concentrating, sleep disorders, fever, anxiety, and depression.
• The subject has previously received BIA 28-6156 or has a known allergy or hypersensitivity to BIA 28-6156 or any components of the formulation.
• The subject is an unsuitable candidate to receive BIA 28-6156 or is unable or unlikely to comply with the dosing schedule or study evaluations in the judgment of the investigator.
• The subject is a member of a protected/vulnerable population, defined as persons who are pregnant, parturient, or breastfeeding; minors; persons who are deprived of liberty; persons who are under psychiatric hospital care; persons who are admitted to a health or social institution for purposes other than research; adults who are under legal protection or who are unable to express their consent; persons who are in an emergency situation and are unable to express their prior consent; and persons who are non-affiliated or a non-beneficiary of a social security system [This does not apply to persons in the United States without health insurance].

Note: Other protocol defined Inclusion/Exclusion Criteria may apply.

Eligibility last updated 1//25/24. Questions regarding updates should be directed to the study team contact.