This study is designed to evaluate the safety and pharmacokinetics of zanubrutinib in subjects with impaired liver function in comparison with healthy subjects

Inclusion Criteria:

• Male and/or female subjects in good health as determined by past medical history, physical examination, vital signs, ECG and laboratory tests at screening.
• Subjects must have a body mass index (BMI) between 18 and 40 kg/m2 to participate at screening.
• Female subject must be of non-childbearing potential, i.e. surgically sterile at least 6 months prior to screening with supportive clinical documentation OR post-menopausal must have no regular menstrual bleeding for at least 12 months prior to inclusion. Menopause will be confirmed by a plasma FSH level of >40 IU/L
• Male subjects must agree to practice 2 highly effective methods of birth control at least one method must be barrier technique.

Additional Inclusion Criteria for Healthy Subjects Only:

• In good health as determined by past medical history, physical examination, vital signs, ECG, and laboratory tests at screening; subjects without diseases/conditions
• Matched with a hepatic impaired patient (mild, moderate or severe, as applicable) using the following criteria: sex, age ±10 years and body mass index (BMI)± 10 kilograms

Additional Inclusion Criteria for Hepatic Impaired Subjects Only:

• History of cirrhosis with supportive documentation (ultrasonography, computed tomography scan, liver biopsy, magnetic resonance imaging, clinical laboratory tests results or physical signs consistent with a clinical diagnosis of liver cirrhosis.
• Child-Pugh Clinical Assessment Score consistent with degree of hepatic impairment.
• Blood pressure of 90 to 155 mmHg (systolic) and 50 to 100 mmHg (diastolic).
• Otherwise considered healthy in general as determined by physical examination findings and laboratory assessments within normal limits.

Exclusion Criteria:

• Subjects with a clinically relevant history or presence of any clinically significant disease.
• History of drug or alcohol abuse within the 12 months prior to dosing.
• A positive human immunodeficiency virus (HIV) Type 1 or 2 test result at screening.
• History of blood donation of 500 mL or more of blood within 2 months prior to screening
• A positive tuberculosis test result.

Additional Exclusion Criteria for Hepatic Impaired Subjects Only:

• Received a liver transplant
• Acute or exacerbating hepatitis
• Active Stage 3 or 4 hepatic encephalopathy
• Previously diagnosed with hepatocellular carcinoma, or a history of cholestatic liver disease or biliary sepsis within the past 2 years.
• Additional Exclusion Criteria for Healthy Subjects Only: A positive Hepatitis B surface antigen (HBsAg) or Hepatitis C test result.
• History of any clinically significant chronic and/or active hepatic disease.