A Comparative Effectiveness Study of Major Glycemia-lowering Medications for Treatment of Type 2 Diabetes

Inclusion Criteria:

1. Men or women diagnosed with diabetes at age ≥ 30 years (≥ 20 for American Indians)

2. Duration of diagnosed diabetes < 10 years

3. HbA1c criteria (at final run-in visit, ~2 weeks prior to randomization): 6.8-8.5%

4. Taking a daily dose of ≥ 1000 mg metformin for a minimum of 8 weeks at final run-in

5. Willingness to administer daily subcutaneous injections, take a second diabetes drug
after randomization, potentially initiate insulin and intensify insulin therapy if
study metabolic goals are not met, perform self-monitoring of blood glucose

6. Fluent in either English or Spanish

7. A negative pregnancy test for all females of childbearing potential (i.e.
pre-menopausal, and not surgically sterile)

8. Provision of signed and dated informed consent prior to any study procedures

Exclusion Criteria:

1. Suspected type 1 diabetes (lean with polyuria, polydipsia, and weight loss with little
response to metformin) or "secondary" diabetes due to specific causes (e.g. previously
diagnosed monogenic syndromes, pancreatic surgery, pancreatitis)

2. Current or previous (within past 6 months) treatment with any diabetes
drug/glucose-lowering medication other than metformin (limited use of no longer than
seven days is allowed, for example during hospitalization)

3. More than 10 years of treatment with metformin at time of randomization screening

4. History of intolerance or allergy or other contraindications to any of the proposed
study medications

5. Resides in the same household with another GRADE study participant

6. Current need for any specific glucose-lowering medications solely for other
conditions, for example for polycystic ovary syndrome

7. Symptomatic hyperglycemia requiring immediate therapy during screening or run-in, in
the judgment of the physician

8. A life-threatening event within 30 days prior to screening or currently planned major
surgery

9. Any major cardiovascular event in previous year, including history of myocardial
infarction, stroke, or vascular procedure such as coronary artery or peripheral bypass
grafting, stent placements (peripheral or coronary) or angioplasty.

10. Plans for pregnancy during the course of the study for women of child-bearing
potential

11. History of or planning bariatric surgery, including banding procedures or surgical
gastric and/or intestinal bypass (if banding removed, may be considered eligible after
1 year)

12. History of congestive heart failure (NYHA 3 or greater)

13. History of pancreatitis

14. History of cancer, other than non-melanoma skin cancer, that required therapy in the 5
years prior to randomization

15. Personal or family history of MEN-2 or family history of medullary thyroid cancer

16. Estimated GFR (eGFR) <30 ml/min/1.73 m2 or end stage renal disease requiring renal
replacement therapy

17. History of severe liver disease or acute hepatitis or ALT > 3 times upper limit of
normal

18. Current alcoholism or excessive alcohol intake

19. Previous organ transplant

20. Treatment with oral or systemic glucocorticoids (other than short-term treatment, for
example for poison ivy) or disease likely to require periodic or regular
glucocorticoid therapy (inhaled steroids are allowed)

21. Treatment with atypical antipsychotics

22. History of hemolytic anemia, chronic transfusion requirement, or other condition
rendering HbA1c results unreliable as indicator of chronic glucose levels, or
hematocrit <35 for males and <33 for females

23. Clinically or medically unstable with expected survival <1 year

24. Unwillingness to permit sites to contact the PCP to communicate information about the
study and the participant's data

25. No non-study PCP or inability to identify such a PCP (who will provide non-study care)
by the time of final run-in

26. Participation in another interventional clinical trial

27. Previous randomization in the GRADE study

28. In the opinion of the principal investigator (PI), any other factor, including
language barrier, likely to limit compliance with the protocol