Clinical Trials

Inclusion Criteria:

1. Age ≥ 2 years old and ≤16.5 years old

2. Clinical diagnosis of JIA by a pediatric rheumatologist within the past 6 months

3. Arthritis affecting ≤4 joints between disease onset and randomization

4. Enrollment in the CARRA Registry

5. Participants of childbearing potential must agree to remain abstinent or agree to use
an effective and medically acceptable form of birth control from the time of written
or verbal assent to at least 66 days after taking the last dose of study drug.

6. Weight ≥50 kg (Canadian Sites only) ¹ Enrollment is defined as having signed consent
to participate in the Limit-JIA study.

Exclusion Criteria:

The presence of any of the following will exclude a study participant from inclusion in the
study:

1. 1. Systemic JIA as defined by 2004 ILAR criteria1

2. Sacroiliitis (clinical or radiographic)

3. Inflammatory bowel disease (IBD)

4. History of psoriasis or currently active psoriasis

5. History of uveitis or currently active uveitis

6. Prior treatment with systemic medication(s) for JIA (e.g. one or more of the
following: DMARD or biologic medication)

7. Current or previous (within 30 days of enrollment) treatment with systemic
glucocorticoids (A short course of oral prednisone [≤ 14 days] is allowed)

8. History of active or chronic liver disease

9. Chronic or acute renal disorder

10. AST (SGOT), ALT (SGPT) or BUN >2 x ULN (upper limit of normal) or creatinine >1.5
mg/dL or any other laboratory abnormality considered by the examining physician to be
clinically significant within 2 months of the randomization visit

11. Presence of any medical or psychological condition or laboratory result which would
make the participant, in the opinion of the investigator, unsuitable for the study

12. Participation in another concurrent clinical interventional study within 30 days of
randomization

13. Known positive human immunodeficiency virus (HIV)

14. Received a live virus vaccine within 1 month of the baseline visit

15. Current or prior positive Purified Protein Derivative (PPD) test or Quantiferon Gold
TB

16. Pregnant, breast feeding, or planned breast feeding during the study duration

17. Planned transfer to non-participating pediatric rheumatology center or adult
rheumatologist in the next 12 months

18. Active malignancy of any type or history of malignancy

19. Chronic or active infection or any major episode of infection requiring
hospitalization or treatment with intravenous (IV) antibiotics within 30 days or oral
antibiotics within 14 days prior to screening

20. Primary language other than English or Spanish

21. Positive for Hepatitis B surface antigen or core antibody

22. <10 Kg in weight

23. If a potential subject has symptoms consistent with COVID-19 and/or known COVID-19
exposure at screening, it is recommended that the site follow CDC guidance regarding
testing and quarantine requirements. The subject can be re-screened when there is no
longer concern for active infection. A subject with a positive COVID -19 test may be
re-screened.