ALN-PNP'nin Sağlıklı Yetişkinlerde ve Metabolik Disfonksiyon İlişkili Steatotik Karaciğer Hastalığı (MASLD) Olan Yetişkin Katılımcılarda Güvenli ve İyi Tolere Edilip Edilmediğini Öğrenmeye Yönelik Bir Çalışma

Uygunluk kriterleri

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Key Inclusion Criteria:

Part A (Healthy Adults):

1. From 18 to 55 years of age
2. For Japanese cohorts ONLY; the Japanese participant must:

   1. Be Japanese, born in Japan, and have both biologic parents and 4 biologic grandparents who are ethnically Japanese and born in Japan
   2. Have maintained a Japanese lifestyle, with no significant change since leaving Japan, including having access to Japanese food and adhering to a Japanese diet
   3. Be living \<10 years outside of Japan
3. Has a Body Mass Index (BMI) between 18 and 32 kg/m\^2, inclusive, at the screening visit
4. Is judged by the investigator to be in good health, as described in the protocol
5. Is in good health based on laboratory safety testing obtained at the screening visit and approximately within 24 hours prior to administration of study drug

Part B and Part C (Participants with MASLD):

1. Part B: From 18 to 65 years of age
2. Part C: From 18 to 75 years of age
3. BMI from 23.0 kg/m2 to 40.0 kg/m2, inclusive, for East Asians (including but not limited to South Koreans, Chinese, Taiwanese, and Japanese) and BMI from 27.0 kg/m2 to 40.0 kg/m2, inclusive, for any other ethnicity at screening visit 1
4. Liver fat content ≥8.5% as measured by MRI-PDFF at screening visit 3

Key Exclusion Criteria:

Part A:

1. History of clinically significant cardiovascular, respiratory, hepatic, renal, gastrointestinal, endocrine, hematological, psychiatric, neurological, or dermatologic disease, as assessed by the investigator, that may confound the results of the study or poses an additional risk to the participant by study participation
2. Presents any concern to the study investigator that might confound the results of the study or poses an additional risk to the participant by their participation in the study
3. Hospitalized for any reason within 30 days of the screening visit
4. Using the Modification of Diet in Renal Disease equation, has a glomerular filtration rate as described in the protocol at the screening visit
5. Has Alanine Aminotransferase (ALT) or Aspartate Aminotransferase (AST) or total bilirubin above the Upper Limit of Normal (ULN) range
6. Is a current smoker or former smoker, including e-cigarettes, who stopped smoking within 3 months prior to the screening visit
7. Has a history of alcohol or drug abuse per investigator opinion
8. Is positive for hepatitis C antibody and if so, positive for qualitative (ie, detected or not detected) Hepatitis C Virus (HCV) Ribonucleic Acid (RNA) test at the screening visit

Part B and Part C:

1. Evidence of other forms of known chronic liver disease, as defined in the protocol
2. Has a contraindication to MRI examinations, as defined in the protocol
3. History of Type 1 diabetes
4. Has lost or gained more than 4.0% body weight over the 3 months prior to or during the screening period
5. Has known Human Immunodeficiency Virus (HIV) infection, evidence of current or chronic Hepatitis B Virus (HBV) infection, or current or chronic HCV infection, as defined in the protocol
6. Bariatric surgery within approximately 5 years (Part B) or 3 years (Part C) prior or planned during the study period

NOTE: Other protocol defined inclusion / exclusion criteria apply