Type 2 diabetes mellitus is a progressive disease and this means that treatment intensification is needed to achieve glycemic goals and, for many patients, insulin will ultimately be needed. There is the potential for insulin to achieve any glycemic target, however, its initiation and up-titration is frequently delayed, partly due to the attendant weight gain and risk of hypoglycemia. Several clinical trials have demonstrated that combining a GLP-1 receptor agonist with basal insulin produces significant reductions in HbA 1c without substantially increasing hypoglycemia or promoting weight gain. A once-daily coformulation of ultralong-acting basal insulin degludec and the GLP-1 analog liraglutide, termed 'IDegLira', has now been developed for patients with Type 2 diabetes. Data from two Phase III clinical trials are encouraging, demonstrating marked HbA 1c reductions with weight loss, low levels of hypoglycemia and limited gastrointestinal side effects. The types of patients that may benefit from a fixed-ratio combination such as IDegLira are discussed here, as are future developments.
BackgroundThe pathophysiology of Type 2 diabetes (T2DM) is characterized by a variable combination of insulin resistance, impaired insulin secretion and hyperglucagonemia. Additional features of the 'ominous octet' of defects in T2DM have also been well described [1]. The progressive nature of T2DM necessitates intensification of treatment to maintain glycemic control over time. Since none of the currently available therapies have been shown to modify the underlying pathophysiology of T2DM, many patients will ultimately need insulin replacement [2].The European Association for the Study of Diabetes (EASD)/American Diabetes Association (ADA) consensus position statement focuses on an HbA 1c of <53 mmol/mol (<7.0%) with initiation of insulin therapy (typically basal insulin) as dual or triple therapy, if a patient does not achieve or maintain target after around 3 months [3]. In England and Wales, when dual oral therapy does not achieve target, NICE recommends intensification with either a third oral agent, a GLP-1 receptor agonist (RA) or basal insulin in patients with an HbA 1c of ≥58 mmol/mol (≥7.5%) [4].