A Global Study to Assess the Drug Dynamics, Efficacy, and Safety of Venglustat (GZ/SAR402671) in Parkinson's Disease Patients Carrying a Glucocerebrosidase (GBA) Gene Mutation

Part 1: Number of Participants With Treatment-Emergent Adverse Events (TEAEs), and Treatment-Emergent Serious Adverse Events (TESAEs)

An adverse event (AE) was defined as any untoward medical occurrence in a participant who received study drug and does not necessarily had to have a causal relationship with the treatment. Serious AEs (SAEs) were any untoward medical occurrence that resulted in any of the following outcomes: death, life-threatening, required initial or prolonged in-patient hospitalization, persistent or significant disability/incapacity, congenital anomaly/birth defect, or considered as medically important event. TEAEs were the AEs that developed or worsened or became serious during the TEAE period (defined as the period from the time of first investigational medicinal product \[IMP\] administration up of 6 weeks after the last administration of the IMP).

Time frame: From the first IMP administration up to 6 weeks after the last administration of the IMP (i.e., up to 42 weeks for ROW and up to 58 weeks for Japanese participants)

Part 1: Number of Participants With Abnormal Physical Examination Findings

Physical examination included following observations/measurements: general appearance; heart, skin, respiratory auscultation; head, eyes, ears, nose, and throat, extremities/joints, and abdomen. New onset of abnormal physical examination was defined as a normal physical examination at Baseline and an abnormal physical examination during the treatment-emergent (TE) period (defined as the period from the time of first IMP administration up of 6 weeks after the last administration of the IMP). Abnormalities in physical examination were based on investigator's evaluation.

Time frame: From the first IMP administration up to 6 weeks after the last administration of the IMP (i.e., up to 42 weeks for ROW and up to 58 weeks for Japanese participants)

Part 1: Number of Participants With Abnormal Neurological Examination Findings

Neurological examination included at least assessments of the participant's cranial nerves, motor system (including muscle atrophy, tone, and power), mental status, deep tendon reflex, sensation, and cerebellar function. Abnormalities in neurological examination were based on investigator's evaluation.

Time frame: From the first IMP administration up to 6 weeks after the last administration of the IMP (i.e., up to 42 weeks for ROW and up to 58 weeks for Japanese participants)

Part 1: Number of Participants With Potentially Clinically Significant Laboratory Abnormalities: Hematology

Criteria for potentially clinically significant abnormalities (PCSA): Hemoglobin: less than or equal to (\<=) 115 grams per liter (g/L) (Male\[M\]) or \<=95 g/L (Female\[F\]), greater than or equal to (\>=) 185 g/L (M) or \>=165 g/L (F), Decrease from baseline (DFB) \>=20 g/L; Hematocrit: \<=0.37 volume/volume (v/v) (M) or \<=0.32 v/v (F), \>=0.55 v/v (M) or \>=0.5 v/v (F); Red blood cells (RBC): \>=6 Tera/L; Platelets: less than (\<) 100 Giga/L, \>=700 Giga/L; White blood cells (WBC): \<3.0 Giga/L (Non-Black \[NB\]) or \<2.0 Giga/L (Black \[B\]), \>=16.0 Giga/L; Neutrophils: \<1.5 Giga/L (NB) or \<1.0 Giga/L (B); Lymphocytes: \<lower limit of normal (LLN), greater than (\>) 4.0 Giga/L; Monocytes: \<LLN, \>0.7 Giga/L; Basophils: \>0.1 Giga/L; Eosinophils: \>0.5 Giga/L or \>upper limit of normal (ULN) (if ULN \>=0.5 Giga/L).

Time frame: From the first IMP administration up to 6 weeks after the last administration of the IMP (i.e., up to 42 weeks for ROW and up to 58 weeks for Japanese participants)

Part 1: Number of Participants With Potentially Clinically Significant Laboratory Abnormalities: Liver Function Parameters

Criteria for PCSA: Alanine Aminotransferase (ALT): \>3 ULN, \>5 ULN; Aspartate aminotransferase (AST): \>3 ULN; Alkaline phosphatase: \>1.5 ULN; Total Bilirubin: \>1.5 ULN; ALT and Bilirubin: \>3 ULN and \>2 ULN; Direct Bilirubin and Bilirubin: \>35% and \>1.5 ULN.

Time frame: From the first IMP administration up to 6 weeks after the last administration of the IMP (i.e., up to 42 weeks for ROW and up to 58 weeks for Japanese participants)

Part 1: Number of Participants With Potentially Clinically Significant Laboratory Abnormalities: Renal Parameters

Criteria for PCSA: Creatinine: \>=150 micromoles per liter (mcmol/L) (adults), \>=30% change from baseline, \>=100% change from baseline; Blood urea nitrogen: \>=17 millimoles (mmol)/L.

Time frame: From the first IMP administration up to 6 weeks after the last administration of the IMP (i.e., up to 42 weeks for ROW and up to 58 weeks for Japanese participants)

Part 1: Number of Participants With Potentially Clinically Significant Laboratory Abnormalities: Metabolic Parameters

Criteria for PCSA: Glucose: \<=3.9 mmol/L and \<LLN; \>=11.1 mmol/L (unfasted \[unfas\]) or \>=7 mmol/L (fasted \[fas\]); Albumin: \<=25 g/L.

Time frame: From the first IMP administration up to 6 weeks after the last administration of the IMP (i.e., up to 42 weeks for ROW and up to 58 weeks for Japanese participants)

Part 1: Number of Participants With Potentially Clinically Significant Laboratory Abnormalities: Electrolytes Parameters

Criteria for PCSA: Sodium: \<=129 mmol/L, \>=160 mmol/L; Potassium: \<3 mmol/L, \>=5.5 mmol/L and Chloride: \<80 mmol/L, \>115 mmol/L.

Time frame: From the first IMP administration up to 6 weeks after the last administration of the IMP (i.e., up to 42 weeks for ROW and up to 58 weeks for Japanese participants)

Part 1: Number of Participants With Potentially Clinically Significant Vital Signs Abnormalities

Criteria for PCSA: Systolic blood pressure (SBP) supine: \<=95 millimeters of mercury (mmHg) and DFB \>=20 mmHg; \>=160 mmHg and increase from baseline (IFB) \>=20 mmHg; Diastolic blood pressure (DBP) supine: \<=45 mmHg and DFB \>=10 mmHg; \>=110 mmHg and IFB \>=10 mmHg; SBP (Orthostatic): \<=-20 mmHg; DBP (Orthostatic): \<=-10 mmHg; Heart rate (HR) supine: \<=50 beats per minute (bpm) and DFB \>=20 bpm; \>=120 bpm and IFB \>=20 bpm; Weight: \>=5% DFB; \>=5% IFB.

Time frame: From the first IMP administration up to 6 weeks after the last administration of the IMP (i.e., up to 42 weeks for ROW and up to 58 weeks for Japanese participants)

Part 1: Number of Participants With Potentially Clinically Significant Ophthalmological Abnormalities

Clinically significant observations in left eye, right eye and any eye (any eye among left and right) were assessed by the investigator based on methods like visual acuity, slit lamp examination, examination of the cornea, lens, and retina. Any abnormal clinically significant ophthalmological examination finding (which was present at screening or not) on any eye during the treatment-emergent period corresponded to cornea verticillata, cataract and abnormal overall evaluation

Time frame: From the first IMP administration up to 6 weeks after the last administration of the IMP (i.e., up to 42 weeks for ROW and up to 58 weeks for Japanese participants)

Part 1: Number of Participants With Potentially Clinically Significant Electrocardiogram Abnormalities

Criteria for PCSA: HR: \<50 bpm; \<50 bpm and DFB \>=20 bpm, \<40 bpm; \>90 bpm, \<90 bpm and IFB \>=20 bpm, \>100 bpm; PR Interval: \>200 milliseconds (msec), \>200 msec and IFB \>=25%, \>220 msec; QRS Interval: \>110 msec, \>110 msec and IFB \>=25%, \>120 msec; QT Interval: \>500 msec; QTc Bazett (QTcB) interval: \>450 msec, \>480 msec, IFB \>30 and \<=60 msec, IFB \>60 msec; QTc Fridericia (QTc F): \>450 msec, \>480 msec, IFB \>30 and \<=60 msec, IFB \>60 msec.

Time frame: From the first IMP administration up to 6 weeks after the last administration of the IMP (i.e., up to 42 weeks for ROW and up to 58 weeks for Japanese participants)

Part 2: Change From Baseline to Week 52 in Movement Disorder Society-Unified Parkinson's Disease Rating Scale (MDS-UPDRS) Part II+III Total Score

MDS-UPDRS is a multimodal scale consisting of 4 parts. Part II assessed motor experiences of daily living (total score range: 0 to 52). It contained 13 questions completed by the participant. Part III assessed the motor signs of PD and was administered by the rater (total score range: 0 to 132). Part III contained 33 scores based on 18 items. In both parts, higher score indicated more severe symptoms. For each question in both parts, numeric score was assigned between 0 to 4, where 0=Normal, 1=Slight, 2=Mild, 3=Moderate, 4=Severe. MDS-UPDRS Total Part II and III score = sum of Part II and III scores with score ranged from 0 (no symptom) to 184 (severe symptoms), where higher scores reflected more severe symptoms of PD. Data for this OM was not planned to be collected and analyzed for Part 1, Part 2: DB period re-randomized participants and Part 2 LTFU period, as pre-specified in protocol.

Time frame: Baseline to Week 52