Patients previously diagnosed with diabetes must not have uncontrolled diabetes (defined as a hemoglobin [Hg] A1C > 7% within 28 days prior to registration) Hemoglobin (Hb)A1c =< 7.0% Hgb-A1C ? 7.5%; Participants with poorly controlled diabetes defined as a hemoglobin A1c (HgbA1c) >= 7.0% Hgb-A1C =< 7.5% Hemoglobin A1c < 7% Glycosylated hemoglobin (Hgb A1c) =< 6.5% Glycated hemoglobin (Hgb-A1C) level of =< 7.5%. Abnormal complete blood count, comprehensive metabolic panel, urine, hemoglobin (Hgb) A1c (study physician discretion) Hemoglobin A1C < 6.5%, within 2 weeks of registration Poorly controlled diabetes defined by hemoglobin A1C > 9.0 at screening. Uncontrolled diabetes (defined as Hgb A1C > 8.0%) Within 14 days of subject registration: Hemoglobin (HB)A1c =< 8% History of peripheral vascular disease (PVD) that has required surgical or percutaneous intervention or documented PVD that requires medical management with medications such as acetylsalicylic acid (ASA) + clopidogrel; patients with diabetes that is not well controlled are excluded from participation; not well controlled is defined as a hemoglobin (Hgb) A1C of greater than 7.5% Patients must not have uncontrolled diabetes mellitus (defined by a hemoglobin [Hgb] A1c > 8) obtained within 14 days prior to registration; optimal glucose control (Hgb A1c =< 8) must be achieved before registration and monitored during protocol treatment Severe and/or uncontrolled medical disease, including: \r\n* Uncontrolled diabetes mellitus (hemoglobin A1c [A1c] > 8) \r\n* Chronic kidney disease stage III or higher (creatinine clearance < 60 mL/min/m^2 by Modified Diet in Renal Disease [MDRD] calculation) \r\n* Active, uncontrolled infection Diabetes mellitus with poor glycemic control (documented hemoglobin A1c > 7% within 4 weeks prior to study entry) Hemoglobin A1c =< 9% Glycosylated hemoglobin (Hgb A1C) > 8.0% Has a history of autoimmune disorders, including uncontrolled diabetes (\uncontrolled\ defined as Hemoglobin A1c ? 9% in 28 days prior to study). Uncontrolled diabetes mellitus as defined by hemoglobin (Hb)A1c > 7% within 28 days prior to registration despite adequate therapy Hemoglobin (Hgb) A1C =< 8% Uncontrolled diabetes defined as a hemoglobin A1C level > 8% (therapeutic action is indicated at greater than 8%) Obtained within 2 weeks from study entry: Hemoglobin A1c (HgBA1c) =< 8% Have poorly controlled diabetes (hemoglobin [HgB] A1C >= 8%) Poorly controlled diabetes (hemoglobin [Hgb] A1C > 9) Hemoglobin (Hgb) A1C =< 8% Uncontrolled diabetes defined as a hemoglobin A1C level > 8% (therapeutic action is indicated at greater than 8%) Hemoglobin (Hgb) A1C =< 8% Uncontrolled diabetes defined as a hemoglobin A1C level > 8% (therapeutic action is indicated at greater than 8%) Patient received previous treatment with oral AC480 For patients with diabetes, hemoglobin A1C test must have been performed =< 90 days prior to registration Hemoglobin A1c > 7.5% or diabetes requiring insulin therapy Participants must have no uncontrolled diabetes mellitus defined as glycosylated hemoglobin (Hgb A1C) > 7% Subjects who have diabetes with a hemoglobin (Hgb) A1c > 7 Glycosylated hemoglobin (Hb A1c) =< 7% Poorly controlled diabetes (hemoglobin A1c [Hgb A1C] > 9 or random blood glucose > 250 mg/dL) Patients with hemoglobin a1c > 6.3 or who are being actively treated for diabetes Hemoglobin A1C > 8.5% Participants with known uncontrolled diabetes, defined as a hemoglobin A1C of > 8%