A Study to Assess the PK, PD, Safety and Tolerability of Eplontersen in Healthy Chinese Volunteers

Prior treatment

• Active infection requiring systemic antiviral or antimicrobial therapy that will not be completed prior to Day 1.
• Treatment with another investigational drug, biological agent, or device within 1 month of screening, or 5 half-lives of study intervention, whichever is longer.
• Previous treatment with an oligonucleotide (including small interfering ribonucleic acid) within 4 months of screening if single dose received, or within 12 months of screening if multiple doses received (exception for SARS-Cov2 vaccines \[both mRNA and viral vector vaccines\]; any vaccine should be administered at least 7 days prior to study intervention).
• Regular use of alcohol within 6 months prior to screening (\> 7 drinks/wk for females, \> 14 drinks/wk for males \[1 drink = 5 ounces (150 mL) of wine or 12 ounces (360 mL) of beer or 1.5 ounces (45 mL) of hard liquor\]), or use of soft drugs (such as marijuana) within 3 months prior to screening, or hard drugs (such as cocaine and phencyclidine) within 1 year prior to screening, or positive urine drug and alcohol screen at screening.
• Concomitant medication restrictions including any prescription and over-the-counter (OTC) and herbal remedies, other than occasional acetaminophen (paracetamol) or ibuprofen unless authorized by the Study Clinical Lead.

Other illness

• Clinically significant abnormalities in medical history (eg, major surgery within 6 months of screening, history or presence of hepatic, renal, hematological, endocrine, or cardiovascular disease) or physical examination.
• Known history of or positive test for human immunodeficiency virus (HIV), hepatitis B antigen, and hepatitis C antibody.
• Uncontrolled hypertension (systolic blood pressure \[BP\] \> 160 mmHg, or diastolic BP \> 100 mmHg).
• Malignancy within 5 years, except for basal or squamous cell carcinoma of the skin or carcinoma in situ of the cervix that has been successfully treated.
• History of bleeding diathesis or coagulopathy.
• Have any other conditions, which, in the opinion of the Investigator or Sponsor would make the participant unsuitable for inclusion, or could interfere with the participant participating in or completing the study.

Lab values

• Screening laboratory results as follows, or any other clinically significant abnormalities in screening laboratory values that would render a participant unsuitable for inclusion:
  • Random spot urine protein/creatinine ratio (UPCR) ≥ 200 mg/g. In the event of UPCR above this threshold ineligibility may be confirmed by a repeat random spot UPCR ≥ 200 mg/g or a 24-hour urine protein ≥ 200 mg/24 hour;
  • Positive test for blood (including trace) on urinalysis that is subsequently confirmed with urine microscopy showing \> 5 red blood cells per high power field;
  • Alanine transaminase (ALT), aspartate aminotransferase (AST), bilirubin, alkaline phosphatase (ALP), serum creatinine, and blood urea \> upper limit of normal (ULN);
  • Fasting blood glucose \> ULN;
  • Platelet count \< lower limit of normal (LLN);
  • Estimated glomerular filtration rate (eGFR) (Chronic Kidney Disease Epidemiology Collaboration \[CKD-EPI\] equation) ≤ 60 mL/min/1.73m2.

Other

• Unwillingness to comply with study procedures, including follow-up, as specified by this protocol, or unwillingness to cooperate fully with the Investigator.
• Smoking limitations: smoking \> 10 cigarettes a day.
• Blood donation of 50 to 499 mL within 30 days of screening or of \> 499 mL within 60 days of screening.

• Must have given written informed consent (signed and dated) and any authorizations required by local law and be able to comply with all study requirements.
• Healthy\* Chinese males or females of non-childbearing potential, aged 18 to 60 inclusive at the time of informed consent.
  • \*Participants will be confirmed to be healthy according to the medical history, electrocardiogram (ECG), vital signs, laboratory results, and physical examination as determined by the Investigator.
• Females must be non-pregnant and non-lactating, and either surgically sterile (eg, tubal occlusion, hysterectomy, bilateral salpingectomy, bilateral oophorectomy) or postmenopausal (defined as 12 months of spontaneous amenorrhea without an alternative medical cause and follicle-stimulating hormone (FSH) levels in the postmenopausal range for the laboratory involved. Males must be surgically sterile or abstinent\*, or if engaged in sexual relations with a female of child-bearing potential, the participant must be using an highly effective contraceptive method from the time of signing the informed consent form until at least 24 weeks after study intervention administration.
  • \* Abstinence is only acceptable as true abstinence, ie, when this is in line with the preferred and usual lifestyle of the participant. Periodic abstinence (eg, calendar, ovulation, symptothermal, post-ovulation methods), declaration of abstinence for the duration of a study and withdrawal are not acceptable methods of contraception.
• Willing to refrain from strenuous exercise/activity (eg, heavy lifting, weight training, intense aerobics classes) for at least 72 hours prior to study visits.
• Weight ≥ 50 kg and body mass index (BMI) of 19 to 30 kg/m2 at screening (including cutoff).
  • BMI = weight (kg)/height2 (m2).
• Willingness to take vitamin A supplements (recommended daily allowance \[RDA\] of approximately 3000 IU/day until the last post-treatment follow-up visit \[Day 92; 13 weeks after the dosing\]).