Primary Objective:

To compare LixiLan to insulin glargine in glycated hemoglobin (HbA1c) change from baseline to Week 26 in patients with type 2 Diabetes.

Secondary Objective:

To compare the overall efficacy and safety of LixiLan to insulin glargine (with or without OADs) over a 26 Week treatment period in patients with type 2 Diabetes.

The maximum study duration per patient will be approximately 29 weeks: an up to 2-week screening period, a 26-week randomized open-label treatment period and a 3-day post-treatment safety follow up period.

Inclusion criteria :

• Patient with type 2 diabetes mellitus (T2DM) diagnosed for at least 1 year before the screening visit, receiving 1 or 2 OADs that can be Biguanide,Thiazolidinedione (TZD), -Alpha-glucosidase-inhibitor (alpha-GI),Sodium glucose co-transporter 2 (SGLT2) inhibitor,Sulfonylurea (SU),Rapid-acting insulin secretagogue (Glinide),diphenyl-peptidase -4 inhibitor (DPP-4 inhibitor).
• Signed written informed consent.

Exclusion criteria:

• At the screening visit: Age <20 years.
• At the screening visit: HbA1c <7.5% or >9.5%.
• At the screening visit: fasting plasma glucose (FPG) >180 mg/dL (10.0 mmol/L).
• Pregnancy or lactation, women of childbearing potential with no effective contraceptive method.
• Use of oral or injectable glucose-lowering agents other than those stated during the inclusion criteria in the 3 months before the screening visit.
• Previous treatment with insulin (except for short-term treatment due to intercurrent illness including gestational diabetes at the discretion of the trial physician).
• Laboratory findings at the time of screening:
• Amylase and/or lipase: >3 times the upper limit of the normal (ULN) laboratory range,
• Alanine aminotransferase (ALT) or aspartate aminotransferase (AST): >3 ULN,
• Calcitonin ≥20 pg/mL (5.9 pmol/L),
• Positive serum pregnancy test in female of childbearing potential.
• Contraindication to use of lixisenatide according to the local labeling. History of hypersensitivity to any Glucagon-Like Peptide-1 Receptor Agonists or to metacresol.
• Contraindication to use of insulin glargine according to local labeling. History of hypersensitivity to insulin glargine or to any of the excipients.
• Patient who has a severe renal function impairment with estimated glomerular filtration rate (eGFR) <30 mL/min/1.73 m^2 or end-stage renal disease for patient not treated with metformin.
• Personal or immediate family history of medullary thyroid cancer (MTC) or genetic condition that predisposes to MTC (eg, multiple endocrine neoplasia syndromes).
• History of pancreatitis (unless pancreatitis was related to gallstones and cholecystectomy has been performed), pancreatitis during previous treatment with incretin therapies, chronic pancreatitis, pancreatectomy, stomach/gastric surgery.

The above information is not intended to contain all considerations relevant to a patient's potential participation in a clinical trial.