Lack of patients with the criteria established in the protocol.

The process of atherosclerosis is multifactorial and involves many mechanisms. The majority of published works have identified endothelial dysfunction as the first step in a cascade of events that culminates in plaque formation. Among the various mechanisms that occur following the attack on the vessel wall, it is thought that stem cells in the form of endothelial progenitor cells (EPCs) are the endothelial protection mechanism.

Factors identified as cardiovascular risk factors, or rather those conditions which suppose a threat to the vessel wall, should therefore be associated with low levels of EPCs. To date this link has been shown in hypertension, diabetes, hyperlipidaemia, and smoking. Furthermore, the lack of wall protection in situations of low levels of EPCs is clearly a biomarker of cardiovascular morbidity and mortality.

On the other hand, the correction of a risk factor allows recuperation of EPCs and is therefore showing itself to be a promising tool for measuring therapeutic efficacy.

The tools for correcting EPC levels are not clearly defined. The effect of statins on levels of EPC has been shown, and the low levels of EPCs in diabetes seem to be susceptible to treatment with statins.

The role of glucagon-like peptide (GLP-1) is slowly being elucidated but the actual mechanism of its potential endothelial protection is unknown, and its effect on EPCs has not been studied.

Liraglutide, a long-acting GLP-1 analogue, could also be an interesting option for long-term vessel wall protection, but to date its ability to correct cardiovascular biomarkers such as EPCs has not been studied.

Inclusion Criteria:

• Informed written consent obtained before any trial-related activities (trial-related activities are any procedures that would not have been performed during normal management of the subject).
• Male or female patients between 18 and 75 years old;
• Subjects diagnosed with type 2 diabetes for more than 1 year
• Insulin naïve subjects (Allowed are: Previous short term insulin treatment < 28 days in total; Treatment during hospitalisation or during gestational diabetes is allowed for periods < 14 days in total)
• Subjects previously treated with metformin at a minimum dose of 1500 mg/day
• HbA1c from 7% to 9%
• Adherence to injection therapy

Exclusion Criteria:

• Type 1 diabetic patients;
• Use of a GLP-1 receptor agonist (exenatide, liraglutide or other), pramlintide, thiazolidinediones or any DPP-4 inhibitor within the 3 months prior to screening;
• Females of childbearing potential who are pregnant, breast-feeding or intend to become pregnant or are not using adequate contraceptive methods (or their partners). Adequate contraceptive measures are considered the use of hormonal based contraceptives in combination with a barrier contraception,
• Patients with a clinical history of serious cardiovascular events in the last 3 months (myocardial infarction, unstable angina, cerebral infarction, TIA, peripheral arteriopathic event);
• Suspected or confirmed acute pancreatitis;
• Personal history of medullary thyroid carcinoma;
• Patients with congestive heart failure (NYHA I-IV);
• Moderate or severe renal failure (creatinine clearance < 60 ml/min);
• Patients with hepatic failure. This is AST or ALT > 3 times the upper limit of normal, history of cirrhosis or hepatitis;
• Patients with cancer in the last 10 years;
• Patients with terminal diseases;
• Patients unlikely to comply with trial procedures;
• Known psychiatric disease which may interfere with study procedure;
• Any other pathology which may interfere with the study results at the investigator's discretion;
• Known or suspected contraindications to or history of hypersensitivity to the trial product or related products;
• Previous participation in this trial i.e. randomised;
• The receipt of any investigational product within 30 days.