A Study to Assess the Safety and Tolerability of Single and Multiple Ascending Doses of Oral RO7020531 in Chinese Healthy Participants.

To evaluate the safety and tolerability of single and multiple ascending doses of oral RO7020531 in Chinese healthy participants.


Eligibility Criteria:
Inclusion Criteria

* Chinese healthy male and female participants. Healthy status is defined by absence of evidence of any active or chronic disease following a detailed medical and surgical history, a complete physical examination including vital signs, 12-lead ECG, hematology, blood chemistry, and urinalysis.
* A Body Mass Index (BMI) of 19 to less than 28 kg/m2 and a body weight of at least 45 kg.
* Negative anti-nuclear antibody (ANA) test; or positive with dilutions not greater than 1:40 and with no associated history or symptoms of potential connective tissue disease or other immune-mediated diseases.
* Women of childbearing potential: agreement to remain abstinent (refrain from heterosexual intercourse) or use contraceptive methods.
* Men: agreement to remain abstinent (refrain from heterosexual intercourse) or use contraceptive measures and refrain from donating sperm.
* Negative pregnancy test on Day -1 for female participants.
* Non-smokers, or use of \< 10 cigarettes (or equivalent nicotine-containing product) per day.

Exclusion Criteria

* Pregnant (positive pregnancy test) or lactating women, and male partners of women who are pregnant or lactating.
* History of immunologically mediated disease (e.g., inflammatory bowel disease, idiopathic thrombocytopenic purpura, lupus erythematosus, autoimmune hemolytic anemia, scleroderma, severe psoriasis, rheumatoid arthritis, multiple sclerosis, or any other autoimmune disease).
* History or symptoms of any clinically significant disease including (but not limited to), neurological, cardiovascular, endocrine, respiratory, hepatic, ocular, or renal disorder (as per Investigator's judgment).
* Personal or family history of congenital long QT syndrome or sudden cardiac death.
* Evidence of an active or suspected cancer or a history of malignancy, where in the Investigator's opinion, there is a risk of recurrence.
* History of having received or currently receiving any systemic anti-neoplastic (including radiation) or immune-modulatory treatment (including systemic oral or inhaled corticosteroids, IFN or PEG-IFN) within 6 months prior to the first dose of study drug or the expectation that such treatment will be needed at any time during the study. Eye drop-containing and infrequent inhaled corticosteroids are permissible up to 4 weeks prior to the first dose of study drug.
* History of clinically significant thyroid disease; also, subjects with clinically significant elevated thyroid-stimulating hormone (TSH) concentrations at Screening.
* Any confirmed clinically significant allergic reactions (anaphylaxis) against any drug, or multiple drug allergies (non-active hay fever is acceptable).
* Abnormal renal function.
* Alanine aminotransferase (ALT) or aspartate aminotransferase (AST) values at Screening above ULN and judged clinically significant by the Investigator.
* Positive results for anti-mitochondrial antibody (AMA), anti-smooth muscle antibody (ASMA) or thyroid peroxidase antibody.
* Positive hepatitis A IgM antibody (HAV Ab IgM), hepatitis B surface antigen (HBsAg), hepatitis C antibody (HCV Ab), or positive for human immunodeficiency virus (HIV) at Screening.