A Study to Investigate the Effect of Hepatic Impairment on the Pharmacokinetics and Safety and Tolerability of a Single Oral Dose of Risdiplam Compared to Matched Healthy Participants With Normal Hepatic Function

Study Overview
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Brief Summary
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This is a multi-center, open-label, non-randomized, parallel-group, 2-part study to evaluate the effect of hepatic impairment on the PK and safety and tolerability of a single oral dose of risdiplam compared to matched healthy participants with normal hepatic function.

Official Title
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An Open-Label, Single-Dose, Parallel-Group, Two-Part Study to Evaluate the Pharmacokinetics and Safety of Risdiplam in Subjects With Mild or Moderate Hepatic Impairment Compared to Subjects With Normal Hepatic Function

Conditions
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Muscular Atrophy, Spinal

Intervention / Treatment
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* Drug: Risdiplam


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: All Participants: BMI between 18.0 and 36.0 kilograms per square metre (kg/m2), inclusive, and body weight > / = 50 kg Females must not be pregnant or lactating and must be of non-childbearing potential Male participants (whether surgically sterilized or not) with female partners of childbearing potential must use methods of contraception from Screening until 4 months after their dose of the study drug as detailed in the protocol Male participants must not donate sperm from Check-in (Day -1) until 4 months after their dose of the study drug Participants with Normal Hepatic Function Only: Matched to participants with mild or moderate hepatic function in sex, age, BMI, and smoking status In good health, as determined by no clinically significant findings from medical history, physical examination, 12-lead ECG, vital sign measurements, and clinical laboratory evaluations Participants with Hepatic Impairment Only: Documented chronic stable liver disease Currently on a stable medication regimen, defined as not starting new drug(s) or changing drug dose(s) within 3 months of administration of study drug Anemia secondary to hepatic disease will be acceptable, if hemoglobin >/= 9 gram per decilitre (g/dL). Participants must have a platelet count </= 35 000 platelets Exclusion Criteria: All Participants Significant history or clinical manifestation of any metabolic, allergic, dermatological, renal, hematological, pulmonary, cardiovascular, gastrointestinal, neurological, respiratory, endocrine, or psychiatric disorder History of significant hypersensitivity, intolerance, or allergy to any drug compound, constituents or excipients of the study drug, food, or other substance History of stomach or intestinal surgery or resection that would potentially alter absorption and/or excretion of orally administered Ventricular dysfunction or history of risk factors for Torsades de Pointes Evidence of hepatorenal syndrome and estimated creatinine clearance range < 60 millilitre per minute (mL/min) or abnormal sodium and potassium levels Clinically significant physical examination abnormality History of diabetes mellitus Use or intend to use any medications/products known to alter drug absorption, metabolism, or elimination processes, including St. John's Wort Positive human immunodeficiency virus (HIV) test Participation in a clinical study involving administration of an investigational drug prior to dosing Smoke more than 10 cigarettes or use the equivalent tobacco- or nicotine-containing products per day Receipt of blood products within 2 months prior to study Donation of blood, plasma, or platelets prior to Screening Poor peripheral venous access Have previously completed or withdrawn from this study or any other study investigating risdiplam, and have previously received the investigational product Participants with Normal Hepatic Function Only: Confirmed supine blood pressure > 150 millimetre of mercury (mmHg) or < 90 mmHg Positive test for hepatitis B or C virus Clinically significant abnormal laboratory values Significant history or clinical manifestation of hepatic disorder History or presence of liver disease or liver injury Use or intend to use any prescription medications/products within 14 days prior to dosing -. Use or intend to use slow-release medications/products considered to still be active within 14 days prior to dosing Use or intend to use any non-prescription medications/products within 7 days prior to dosing Participants with Hepatic Impairment Only: Confirmed supine blood pressure > 159 mmHg or < 90 mmHg Values outside the normal range for liver function tests that are not consistent with their hepatic condition Use of a new medication, or a change in dose, for the treatment, or worsening of, hepatic encephalopathy Use of prescription drugs within 14 days of study drug administration Recent history of, or the treatment of, esophageal bleeding Presence of a portosystemic shunt Recent history of paracentesis Current functioning organ transplant or are waiting for an organ transplant Evidence of severe ascites History or current symptoms of hepatic encephalopathy Grade 2 or above

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 70 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Part 1<br>Participants with mild hepatic impairment and demographically matched healthy participants with normal hepatic function will be enrolled. Participants will receive a single oral dose of 5 mg risdiplam. | Drug: Risdiplam<br>* 5 milligram (mg) oral dose administered in fasted state<br>|
| Experimental: Part 2<br>Participants with moderate hepatic impairment and demographically matched healthy participants with normal hepatic function will be enrolled. Participants will receive a single oral dose of 5 mg risdiplam. | Drug: Risdiplam<br>* 5 milligram (mg) oral dose administered in fasted state<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Part 1: Area Under the Plasma Concentration-Time Curve From Time Zero to Infinity (AUCinf) of Risdiplam and Its Metabolite (M1) |  | Predose, 1, 2, 4, 6, 8, 10, 12, 24, 36, 48, 72, 96, 120, 144, 168, 192, 216, 240, 264, 312, 336, 360, 408, 456, 504, and 552 hours Postdose | 
| Area Under the Plasma Concentration-Time Curve From Time Zero to the Last Measurable Concentration (AUClast) of Risdiplam and M1 |  | Predose, 1, 2, 4, 6, 8, 10, 12, 24, 36, 48, 72, 96, 120, 144, 168, 192, 216, 240, 264, 312, 336, 360, 408, 456, 504, and 552 hours Postdose | 
| Part 1: Maximum Observed Plasma Concentration (Cmax) of Risdiplam and M1 |  | Predose, 1, 2, 4, 6, 8, 10, 12, 24, 36, 48, 72, 96, 120, 144, 168, 192, 216, 240, 264, 312, 336, 360, 408, 456, 504, and 552 hours Postdose | 
| Part 2: AUCinf of Risdiplam and M1 |  | Predose, 1, 2, 4, 6, 8, 10, 12, 24, 36, 48, 72, 96, 120, 144, 168, 192, 216, 240, 264, 312, 336, 360, 408, 456, 504, and 552 hours Postdose | 
| Part 2: AUClast of Risdiplam and M1 |  | Predose, 1, 2, 4, 6, 8, 10, 12, 24, 36, 48, 72, 96, 120, 144, 168, 192, 216, 240, 264, 312, 336, 360, 408, 456, 504, and 552 hours Postdose | 
| Part 2: Cmax of Risdiplam and M1 |  | Predose, 1, 2, 4, 6, 8, 10, 12, 24, 36, 48, 72, 96, 120, 144, 168, 192, 216, 240, 264, 312, 336, 360, 408, 456, 504, and 552 hours Postdose | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Part 1: Time of the Maximum Observed Plasma Concentration (Tmax) of Risdiplam and M1 |  | Predose, 1, 2, 4, 6, 8, 10, 12, 24, 36, 48, 72, 96, 120, 144, 168, 192, 216, 240, 264, 312, 336, 360, 408, 456, 504, and 552 hours Postdose | 
| Part 1: Apparent Plasma Terminal Elimination Half-Life (t1/2) of Risdiplam and M1 |  | Predose, 1, 2, 4, 6, 8, 10, 12, 24, 36, 48, 72, 96, 120, 144, 168, 192, 216, 240, 264, 312, 336, 360, 408, 456, 504, and 552 hours Postdose | 
| Part 1: Percentage of Area Under the Plasma Concentration-Time Curve Due to Extrapolation (%AUCextrap) of Risdiplam and M1 |  | Predose, 1, 2, 4, 6, 8, 10, 12, 24, 36, 48, 72, 96, 120, 144, 168, 192, 216, 240, 264, 312, 336, 360, 408, 456, 504, and 552 hours Postdose | 
| Part 1: Terminal Elimination Rate Constant (λz=Lambda-Z) of Risdiplam and M1 |  | Predose, 1, 2, 4, 6, 8, 10, 12, 24, 36, 48, 72, 96, 120, 144, 168, 192, 216, 240, 264, 312, 336, 360, 408, 456, 504, and 552 hours Postdose | 
| Part 1: Apparent Total Clearance (CL/F) of Risdiplam |  | Predose, 1, 2, 4, 6, 8, 10, 12, 24, 36, 48, 72, 96, 120, 144, 168, 192, 216, 240, 264, 312, 336, 360, 408, 456, 504, and 552 hours Postdose | 
| Part 1: Molecular Weight-Adjusted Metabolite-to-Parent Ratio for AUCinf of Risdiplam M1 |  | Predose, 1, 2, 4, 6, 8, 10, 12, 24, 36, 48, 72, 96, 120, 144, 168, 192, 216, 240, 264, 312, 336, 360, 408, 456, 504, and 552 hours Postdose | 
| Part 1: Molecular Weight-Adjusted Metabolite-to-Parent Ratio for Cmax of Risdiplam M1 |  | Predose, 1, 2, 4, 6, 8, 10, 12, 24, 36, 48, 72, 96, 120, 144, 168, 192, 216, 240, 264, 312, 336, 360, 408, 456, 504, and 552 hours Postdose | 
| Part 1: Molecular Weight-Adjusted Metabolite-to-Parent Ratio for AUClast of Risdiplam M1 |  | Predose, 1, 2, 4, 6, 8, 10, 12, 24, 36, 48, 72, 96, 120, 144, 168, 192, 216, 240, 264, 312, 336, 360, 408, 456, 504, and 552 hours Postdose | 
| Part 2: Tmax of Risdiplam and M1 |  | Predose, 1, 2, 4, 6, 8, 10, 12, 24, 36, 48, 72, 96, 120, 144, 168, 192, 216, 240, 264, 312, 336, 360, 408, 456, 504, and 552 hours Postdose | 
| Part 2: t1/2 of Risdiplam and M1 |  | Predose, 1, 2, 4, 6, 8, 10, 12, 24, 36, 48, 72, 96, 120, 144, 168, 192, 216, 240, 264, 312, 336, 360, 408, 456, 504, and 552 hours Postdose | 
| Part 2: %AUCextrap of Risdiplam and M1 |  | Predose, 1, 2, 4, 6, 8, 10, 12, 24, 36, 48, 72, 96, 120, 144, 168, 192, 216, 240, 264, 312, 336, 360, 408, 456, 504, and 552 hours Postdose | 
| Part 2: λz of Risdiplam and M1 |  | Predose, 1, 2, 4, 6, 8, 10, 12, 24, 36, 48, 72, 96, 120, 144, 168, 192, 216, 240, 264, 312, 336, 360, 408, 456, 504, and 552 hours Postdose | 
| Part 2: CL/F of Risdiplam and M1 |  | Predose, 1, 2, 4, 6, 8, 10, 12, 24, 36, 48, 72, 96, 120, 144, 168, 192, 216, 240, 264, 312, 336, 360, 408, 456, 504, and 552 hours Postdose | 
| Part 2: Molecular Weight-Adjusted Metabolite-to-Parent Ratio for AUCinf of Risdiplam M1 |  | Predose, 1, 2, 4, 6, 8, 10, 12, 24, 36, 48, 72, 96, 120, 144, 168, 192, 216, 240, 264, 312, 336, 360, 408, 456, 504, and 552 hours Postdose | 
| Part 2: Molecular Weight-Adjusted Metabolite-to-Parent Ratio for Cmax of Risdiplam M1 |  | Predose, 1, 2, 4, 6, 8, 10, 12, 24, 36, 48, 72, 96, 120, 144, 168, 192, 216, 240, 264, 312, 336, 360, 408, 456, 504, and 552 hours Postdose | 
| Part 2: Molecular Weight-Adjusted Metabolite-to-Parent Ratio for AUClast of Risdiplam M1 |  | Predose, 1, 2, 4, 6, 8, 10, 12, 24, 36, 48, 72, 96, 120, 144, 168, 192, 216, 240, 264, 312, 336, 360, 408, 456, 504, and 552 hours Postdose | 
| Part 1 and Part 2: Percentage of Participants With Treatment-Emergent Adverse Events (AEs) and Serious Adverse Events (SAEs) | An adverse event is any untoward medical occurrence in a participant administered a pharmaceutical product and which does not necessarily have to have a causal relationship with the treatment. An adverse event can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding, for example), symptom, or disease temporally associated with the use of a pharmaceutical product, whether or not considered related to the pharmaceutical product. Preexisting conditions which worsen during a study are also considered as adverse events. | Up to 31 Days |