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Clinical Features - Review

Obviating much of the need for insulin therapy in type 2 diabetes mellitus: A re-assessment of insulin therapy’s safety profile

, &
Pages 609-619 | Received 29 Feb 2016, Accepted 17 May 2016, Published online: 03 Jun 2016
 

ABSTRACT

Current processes of care for diabetes mellitus (DM) were shaped during the era when insulin therapy was considered inexorable to the management of advanced stage type 2 (T2DM), though this no longer appears to be categorically true. There are also dashed hopes that insulin therapy can prevent or stall diabetes. While exogenous insulin remains a life-sparing tool for fully insulin-dependent DM, insulin therapy-induced hyperinsulinemia now appears to contribute to serious safety issues beyond hypoglycemia and weight gain. Iatrogenic and compensatory hyperinsulinemia are metabolic disruptors of β-cells, liver, muscle, kidney, brain, heart and vasculature, inflammation, and lipid homeostasis, among other systems. This may compromise β-cells, exacerbate insulin resistance (IR), and increase risk of cardiovascular (CV) disease. Striking associations between exogenous insulin and risks of CV events, cancer, and all-cause mortality in clinical trial and real-world cohorts caution that insulin may pose more harm than previously evidenced. At our disposal are numerous alternate tools that, alone or in combination, efficaciously manage hyperglycemia and glucolipotoxicity, and do so without inducing hypoglycemia, weight gain, or hyperinsulinemia. Moreover, these new tools support true precision therapy, as modern day drug classes can be aligned with the various mediating pathways of hyperglycemia at work in any given patient. Some also appear to promote β-cell survival, with intriguing data being presented for newer agents, such as incretins. As such, we encourage preferential use of non-insulin antidiabetic agents to injected insulin for the management of non-insulin-dependent patients with T2DM, including in advanced stage T2DM. The goal of this article is to augment existing literature to 1) correct misconceptions on the rationale and necessity for insulin therapy in T2DM, 2) discuss emerging negative safety data with insulin therapy, and, 3) offer a practical means to reduce reliance on insulin through delayed initiation, minimized dose, and, drug switching to safer agents, and, potentially, reframes processes of care.

Declaration of interest

SS Schwartz is a speaker and advisor to Novo Nordisk, Merck, Takeda, Johnson and Johnson, AstraZeneca/Bristol-Myers Squibb, Eli Lilly and Company, Boehringer lngelheim/Eli Lilly and Company, and, a speaker for Eisai and GlaxoSmithKline. PS Jellinger is a speaker for Novo Nordisk, Janssen, Astra-Zeneca, Boehringer lngelheim, Merck and has served as an advisor for AstraZeneca. The authors have no other relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript apart from those disclosed.

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