The Efficacy, Safety, and Immunogenicity Study Comparing an Insulin Glargine Biosimilar Sansulin Log-G to Lantus

Inclusion Criteria: 1. Patients with DM type 2, age at least 18 years, both genders. 2. T2DM patients who have been diagnosed for \> 1 year, and have been treated with one oral antidiabetic at stable doses for \> 3 months prior to screening, have BMI of 18.0 to 35.0 kg/m2 inclusive, and HbA1C of \> 7.0% and insulin-naive. 3. Patients who are cooperative, reliable, and agree to have regular injections of insulin, and are willing to comply with protocol procedure (willing to sign the informed consent). 4. Female patients with adequate protection from conception. Females of childbearing potential must use a reliable method of birth control during the study (barrier-method or IUD). Women with history of bilateral tubal ligation, or with total hysterectomy, or who are 2 years postmenopausal are also eligible. Exclusion Criteria: 1. Pregnancy (confirmed by a positive urine pregnancy test) or lactation. 2. History of severe hypoglycemia during the last year (blood glucose level \<50 mg/dl with transient dysfunction of central nervous system without other apparent cause) 3. History of diabetic ketoacidosis \> 2x within the last year. 4. Having hyperglycemia hyperosmolar status (HHS) 5. Renal impairment (eGFR \< 30 mL/min). 6. An employee of the Investigator or the Sponsor. 7. Participating in another clinical study within the past 3 months. 8. Receiving any immunosuppressants, including corticosteroids or cytostatics within the last year or during the study. 9. Receiving any drug or supplement with hypoglycemic activity (except oral antidiabetics) within 4 weeks prior to screening and during the study. 10. Receiving any drug with hyperglycemic activity within 4 weeks prior to screening and during the study (eg. second generation antipsychotics, corticosteroids, tacrolimus, protease inhibitors). 11. Have undergone pancreatectomy or pancreas / islet cell transplant. 12. Mental disorder 13. Any malignancies