Recombinant Human Insulin in Global Diabetes Management – Focus on Clinical Efficacy

European Endocrinology, 2017;13(1):21–5 DOI: https://doi.org/10.17925/EE.2017.13.01.21

Abstract:

Biosynthetic human insulin and insulin analogues are the mainstay of insulin therapy for both type 1 and type 2 diabetes although access to human insulin at affordable prices remains a global issue. The world is experiencing an exponential rise in the prevalence of diabetes presenting an urgent need to establish effective diabetes therapy in countries burdened by inadequate health care budgets, malnutrition and infectious diseases. Recombinant human insulin has replaced animal insulins and animal-based semisynthetic human insulin thereby available in sufficient quantities and at affordable prices able to provide global access to insulin therapy. In many patients, analog insulins can offer additional clinical benefit, although at a considerably higher price thus severely restricting availability in low income countries. The approval process for recombinant human insulins (i.e. biosimilars) and analogue insulins is highly variable in the developing countries in contrast to Europe and in North America, where it is well established within a strict regulatory framework. This review aims to discuss the future access to human insulin therapy in a global context with an ever increasing burden of diabetes and significant economic implications.
Keywords: Diabetes mellitus, biosynthetic human insulin, biosimilar and analogue insulins, regulatory requirements, cost, global access
Disclosure: Jean Claude Mbanya is member of the Sanofi AMESA Diabetes Advisory Board. Juergen Sandow is a consultant to Sanofi Paris and Academic Research Associate. Wolfgang Landgraf is an employee of Sanofi-Aventis Germany. David Owens has received honoraria from Boehringer Ingelheim, Eli Lilly, Sanofi and Takeda for lectures and/or advisory boards.

Authorship:All named authors meet the International Committee of Medical Journal Editors (ICMJE) criteria for authorship of this manuscript, take responsibility for the integrity of the work as a whole, and have given final approval to the version to be published.

Acknowledgments: The contents of the paper and the opinions expressed within it are those of the authors, and it was the decision of the authors to submit the manuscript for publication. The authors take responsibility for the writing of this manuscript, including critical review and editing of each draft, and approval of the submitted version. The authors received writing/editorial support in the preparation of this manuscript provided by Catherine Amey from Touch Medical Media, this was funded by Sanofi.

Compliance with Ethics: This article involves a review of the literature and did not involve any studies with human or animal subjects performed by any of the authors.

Received: August 11, 2016 Accepted February 13, 2017
Correspondence: David R Owens, Diabetes Research Group, College of Medicine, University of Swansea, Wales, UK. E: OwensDR@cardiff.ac.uk
Support: The publication of this article was supported by Sanofi.
Open Access: This article is published under the Creative Commons Attribution Noncommercial License, which permits any non-commercial use, distribution, adaptation and reproduction provided the original author(s) and source are given appropriate credit.

The International Diabetes Federation (IDF) estimated that the total number of adults (20–79 years) living with diabetes in 2015 was 415 million and that by 2040, the number is predicted to rise to 642 million (see Figure 1).1 In countries with a low healthcare budget, biosynthetic human insulin is the mainstay of effective therapy, and is now available from an increasing number of suppliers, at an affordable price locally. However, the overall cost of diabetes care has been increasing due to the dramatic and relentless increase in prevalence globally. A significant part is related to cost of insulin in the form of human insulin, and the much more expensive option of analogue insulins. Insulin therapy is indispensable in type 1 diabetes (T1DM) and is essential for type 2 diabetes (T2DM), first presenting at an advanced stage or when orally active antidiabetic drugs (OAD) fail to maintain adequate glycaemic control with the many newer therapeutic options increasingly costly. The American Diabetes Association (ADA) estimates that the total cost of known diabetes in the US rose by about 40% over a five-year period from US$174 billion in 2007 to US$245 billion in 2012.2 representing 20% of all healthcare dollars in the US. A significant part of this increase was attributed to the cost of new analogue insulins and new OAD drugs.

In contrast, worldwide, the cost of recombinant human insulin has been decreasing, due to large-scale production, competition between insulin manufacturers in different geographic areas (for example, India and Asian countries). In the US, human insulin formulations are now often available from drugstore pharmacies without a prescription. This includes the classically low-priced category of insulin vials and syringes, and also some insulin pen devices. Interestingly, in the US recently a price differential has developed between regular human insulin and intermediate-acting human neutral protamine hagedorn (NPH) insulin.



The situation is very different in low-income countries, where access to recombinant human insulin formulations at affordable price levels remains to be established and/or maintained. This is very obviously a question to be addressed by national and regional healthcare systems. Globally, 12% of health expenditure is currently consumed by diabetes and diabetes-related complications with major differences related to the access to diabetes care and provision of effective medication.1

The mean annual health expenditure per person with diabetes in 2010 was highest in North America and lowest in South-East Asia (see Figure 3).3 The capital expenditures on diabetes per person per year also differed among different countries of the world,4 with half of all nations spending less than US$400, 42% of countries less than US$300 and 20% allocating less than US$100 per person per year.5 The fraction of capital expenditure attributed to insulin therapy is particularly high in countries with low health budgets, because there are no other therapeutic options for persons with T1DM.

Many regions of the world, such as Asia, are currently experiencing a disproportionally large increase in the prevalence of diabetes, both T1DM and T2DM, due to more effective screening, enhanced early diagnosis, and changes in lifestyle due to rapid economic growth and urban development. In Asia, T2DM tends to develop at a younger age and in those with a lower body mass index than in Europe and North America.6 According to the World Health Organization (WHO), the western Pacific region has 153 million adults with diabetes, which is substantially more than either in China (109.6 million) or India (69.2 million). On the continent of Africa, the expected rate of increase in prevalence of diabetes is amongst the highest in the world.7 In an assessment of the treatment options, the WHO has addressed issues on how to support the production of pharmaceuticals in Africa.8,9

Insulin by injection remains the most effective component of diabetes management.6,10 Therapy in T1DM needs to be initiated at or near the time of diagnosis. Therapy by insulin in T2DM is most often initiated when OAD drugs no longer achieve effective glycaemic control. Metformin is the most common first-line therapy,followed by the addition of a sulfonylurea, dipeptidyl peptidase 4 (DPP-4) inhibitor, an insulin sensitiser, a sodium-glucose co-transporter-2(SGLT2) inhibitor or a glucagon-like peptide 1 (GLP-1) receptor agonistas second line. Insulin-based therapy is usually the third line when orally active drugs fail.11 Insulin may be commenced at an early stage if on presentation the person with T2DM is markedly hyperglycaemic (glycated haemoglobin [HbA1c] >8%) with symptoms. Clinical evidence suggests that the introduction of insulin earlier in the treatment of patients with T2DM can modulate the disease process and significantly improve glycaemic control.12,13 Where there is a strong rationale to initiate insulin therapy at an early stage of T2DM, selecting an affordable biosynthetic human insulin (or animal insulin) should be considered in preference to analogue insulins. Initiation of insulin therapy is often delayed, despite the evidence of chronic poor glycaemic control (‘clinical inertia’) or simply due to limited access. A GLP-1 receptor agonist is advocated when the body mass index exceeds 35 kg/m prior to or as add-on to insulin therapy. Therapy change always needs to take into consideration both the clinical situation and the patient’s preference. There are clinical situations when analogue insulins have important advantages, in paediatrics,14 in pregnancy15 and in Ramadan.16 Many people with diabetes unfortunately remain in poor glycaemic control17,18 due to barriers such as compliance to therapy, patient and healthcare professional preferences, and resource allocation, all of which must be addressed.19

Global availability of insulin
The global supply situation for insulins has improved steadily since the early period, when animal insulins were gradually replaced by chemical synthesis of human insulin and semisynthetic human insulin,20 due to concerns about future limitations of supply. The global supply of recombinant human insulin and analogue insulins has improved steadily (Table 2). A recent market survey on global insulin supply concluded that at the moment, insulin production has been able to sustain the increase in demand.21 Significant inequalities exist in the global availability of human insulin at affordable cost in developing countries, often limiting access to this crucial therapy22 despite its inclusion in the WHO’s Essential Medicines List. Based on the International Insulin Foundation’s (IIF’s) assessment, the root cause relates to distribution, tendering and government policies which are all aimed at reducing diabetes-related expenditures.23 The situation is critical in countries with limited resources, where human insulin (formulations of soluble and NPH insulin) is the only affordable option. The introduction of analogue insulins24,25 and new injectable and orally active diabetic agents have contributed significantly to the steadily increasing cost of diabetes care in Europe and North America, with reimbursement an increasing problem restricting their availability.26 In the US, the use of insulin among privately insured adults with T2DM mellitus increased by approximately 50% between 2000 and 2010 (see Figure 3),27 which coincides with the widespread prescription of analogue insulins and recently developed coformulations, due to specific advantages of personal convenience and a reduced risk of hypoglycaemia.28 In Europe, cost and re-imbursement remain critical issues for patientrelated decisions. However, many healthcare schemes retain human insulin on their essential drug lists and continue to encourage their use due to long-term established therapeutic efficacy.29 The three essential medicines for T2DM are metformin, sulfonylureas and human insulin.30 Metformin is available in generic form, with sulfonylureas and biosynthetic human insulin also now widely available. The global market for human insulin is dominated by three major insulin manufacturers including Eli Lilly, Novo Nordisk and Sanofi. Prescribing human insulin formulations is a logical and practical approach to reducing costs, with the recent option of considering biosimilar insulin analogues, which involves complex and evolving approval procedures ongoing in Asia, India and Africa.22

The global insulin market
When considering the cost of human insulin formulations (see Table 1), there is a clear cost benefit in favour of the classical vial and syringe formulations and the more convenient human insulin pen presentations. The cost difference of adopting formulations of analogue insulins has little justification for the vast majority of insulin-treated persons with diabetes. The price is on average fivefold higher for insulin analogues, although it is decreasing gradually in certain markets with the availability of biosimilar analogue insulins (for example, insulin glargine). However, currently the costs involved remains out of range for many developing countries. For basal insulin therapy, analogue insulins22 have advantages over NPH human insulin but cost remains a prohibiting factor in such countries.

Approved and marketed human insulin products
In the WHO Essential Drugs List, insulin (soluble) and intermediate acting insulin (NPH) are listed without further detail or reference to products.31 Brand names differ considerably by global region and a search using the international non-proprietary names (INN, insulin human) as well as careful identification of the specific formulations is recommended. In each case, the active pharmaceutical ingredient (API) is recombinant human insulin.

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Keywords: Diabetes mellitus, biosynthetic human insulin, biosimilar and analogue insulins, regulatory requirements, cost, global access