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A cost-effectiveness evaluation of the originator follitropin alpha compared to the biosimilars for assisted reproduction in Germany

Authors Xue W, Lloyd A, Falla E, Roeder C, Papsch R, Bühler K

Received 1 November 2018

Accepted for publication 16 March 2019

Published 13 May 2019 Volume 2019:11 Pages 319—331

DOI https://doi.org/10.2147/IJWH.S193048

Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 4

Editor who approved publication: Professor Elie Al-Chaer

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Weiguang Xue,1 Adam Lloyd,1 Edel Falla,1 Claudia Roeder,2 Rudiger Papsch,2 Klaus Bühler3,4

1IQVIA, Real-World Evidence, London, UK; 2Merck KGaA, Frankfurt, Germany; 3Centre for Gynecology Endocrinology & Reproductive Medicine Kinderwunsch-Zentrum Stuttgart, Stuttgart, Germany; 4Department of Gynecology, Jena-University Hospital-Friedrich Schiller University, Jena, Germany

Background and objectives: Demand for assisted reproduction technology (ART) in Germany is high, with 100,844 treatment cycles during 2016. Many ART procedures involve ovarian stimulation with follicle stimulating hormone (FSH). Recently, biosimilar FSH products have become available. The objective of this study was to evaluate the cost-effectiveness of the recombinant FSH Gonal-f®, (Originator) in comparison to biosimilar follitropin alfa, Bemfola®, (Biosimilar 1) and Ovaleap®, (Biosimilar 2), from a German payer perspective in terms of cost per live birth.
Methods: A decision tree model was developed, based on one cycle of assisted reproduction, to compare the original product to biosimilars. Clinical inputs, including live birth rates and adverse event rates were obtained from published randomized trials. Cost inputs were obtained from publicly available German sources. Clinical inputs, model structure and methodology were based on previous publications and validated by a clinical expert.
Results: Results indicated that the live birth rate is higher for the Originator compared to Biosimilar 1 (40.7% vs 32.1% respectively), and Biosimilar 2 (32.2% vs 26.8%). The average cost per live birth for women treated with the Originator was estimated to be lower than those who were treated with biosimilars: Originator vs Biosimilar 1 (€10,510 vs €12,192), Originator vs Biosimilar 2 (€12,590 vs €13,606). The analysis also found that the Originator is associated with an incremental cost-effectiveness of €4,168 and €7,540 per additional live birth versus Biosimilar 1 and Biosimilar 2 respectively. Sensitivity analysis indicated probabilities of pregnancy, embryo transfer and live birth, were key drivers of model costs. Scenario analysis confirmed the robustness of the model outcomes.
Conclusion: This study suggests that treatment with the Originator could result in a lower cost per live birth in comparison to biosimilars. Further analysis using real-world data, when available, is recommended to validate the results of the present study.

Keywords: reproductive techniques, follitropin alfa, cost per live birth

Introduction

Demand for assisted reproductive technology (ART) in Germany is high, with a reported 100,844 treatment cycles during 2016.1 This included 15,476 in-vitro fertilization (IVF) cycles, 50,111 intracytoplasmic sperm injection (ICSI) cycles and 24,842 cryo-transfer cycles.1 With restrictive public financing and a high cost burden, there is pressure to limit the costs of fertility treatments, whilst maximizing success rates.2,3

IVF and ICSI procedures both involve controlled ovarian stimulation (COS) with follicle stimulating hormone (FSH) injections.4 This strategy of stimulating ovaries, with gonadotropins is well established with the first generation of gonadotropins, produced from the urine of menopausal women, on the market since the 1970’s.5 Gonal-f®, (Merck , Darmstadt, Germany; the Originator) is a fourth-generation gonadotropin, a recombinant FSH (rFSH), which first entered the market in 1995, that has a well-established portfolio of published efficacy, safety and clinical real-world post-marketing evidence and experience.613

Follitropin alfa biosimilars (Bemfola®, Gedeon Richter UK Ltd, London, UK [Biosimilar 1]; and Ovaleap®; CVC Capital Partners, Luxembourg [Biosimilar 2]) have recently entered the market, with the sole purpose of producing cost savings over the originator product. Each biosimilar is supported by a single study powered to test non-inferiority in the number of oocytes collected compared with the originator product.14,15 Although gonadotropins are prescribed to stimulate the ovaries to increase egg production, the primary goal of administration is to achieve a live birth.16 By definition, a biosimilar medicine should be biologically similar to the reference medicine, with comparable safety and efficacy.17 However, differences in the batch-to-batch consistency between the products could lead to differences in effectiveness during stimulation cycles. For the Originator product, there is very low batch-to-batch variability (<2%),18 which enables precise dosing.19 Indeed, the batch-to-batch variability for glycosylation profile and specific activity was assessed for >200 batches before the filled by mass and relative specific activity parameters were considered by the European Medicines Agency (EMA). However, the filled-by-mass calibration for biosimilars was assessed on only two pivotal clinical batches. Furthermore, a recent study comparing in-vivo biological activity and glycosylation between the Originator and Biosimilar 1 found differences in the glycan profile of the biosimilar, which may be associated with differences in receptor activation and biological activity (Biosimilar 1 potency was 14,522 IU/mg and the mean specific activity was 105.6% of the nominal value; the Originator potency was 13,159 IU/mg and the mean specific activity was 97.3% of the nominal value [p=0.0048]).20 Although this was within the range stated in the product label, it clearly shows a difference between the two products.

Furthermore, while authorization of a biosimilar is based on similarity to the originator product, this does not necessarily imply that biosimilars are interchangeable, rather their use is regulated according to individual countries and the treating physician.21 Consequently, there is a pressing need to ensure that the choice of a biosimilar is fully informed, including any comparisons of cost-effectiveness. As there are insufficient real-world data on which to base a suitably powered cost-effectiveness analysis on follitropin alfa biosimilars, the currently available multicenter randomized controlled trials that were conducted in broadly similar populations provide the most reliable data on pregnancy and live birth outcomes to date.14,15 As these trials were designed to enable marketing approval, we can assume that they reflect clinical use and, consequently, the data reported are robust enough to be used as the basis of the cost-effectiveness analysis. While this may not be standard methodology, there are precedents for this approach published in the literature.2224

As the impact of biosimilars on costs per assisted reproduction treatment course and clinically meaningful outcomes has yet to be investigated in Germany, the objective of this study was to develop a cost-effectiveness model to investigate the cost and clinical outcomes of the Originator in comparison to rFSH biosimilars from a German payer perspective, in terms of the cost per live birth.

Methods

Studies by Rettenbacher et al and Strowitzki et al, the two randomised controlled trials used to demonstrate similar efficacy and safety to the originator follitropin-alpha as part of the marketing authorization application of the biosimilar to the EMA, were chosen to inform clinical inputs for the comparison versus the Originator.14,15 These trials were chosen as no other studies for the Originator versus Biosimilar 1 or Biosimilar 2 where available at time of the analysis. These studies and the model we have employed have been used in several other estimates of the cost-effectiveness of follitropin alfa.2224

Model structure

A decision tree model was developed in Microsoft Excel 2013. The model was based on one cycle of assisted reproduction for the comparison of the Originator to both biosimilars (Figure 1). Key stages of one fresh cycle of assisted reproduction were defined in terms of eight discrete states (oocyte retrieval, no oocyte retrieval, embryo transfer, no embryo transfer, pregnancy, no pregnancy, live birth, and miscarriage). During the cycle, patients may also experience an adverse event from ovarian stimulation: ovarian hyper-stimulation syndrome (OHSS). The model was composed of four different pathway endpoints (no oocyte retrieval, no embryo transfer, live birth, no live birth).

Figure 1 Cost-effectiveness model decision-tree structure.

Each of the model states was associated with a separate cost. The proportion of patients at the end of each treatment pathway, multiplied by the relevant cost and resource use, and the total sum of all pathways was used to generate overall costs for each intervention.

Model outputs included live birth rates, total costs, cost per live birth, and incremental cost-effectiveness ratio (ICER), estimated as the difference in costs divided by the difference in live birth rates of two comparators.

Clinical inputs

The probability of moving from one model state to another was based on the biosimilar clinical trial data (Rettenbacher et al14 and Strowitzki et al15). The primary objective of both Rettenbacher et al14 and Strowitzki et al15 was to demonstrate non-inferiority to the Originator, in terms of the number of oocytes retrieved. The rate of live birth was a secondary outcome in both trials.

The proportion of patients moving from oocyte retrieval to embryo transfer, etc were conditional on the success of the previous stage and, as such, the final birth rate, was conditional upon those who achieved an “ongoing pregnancy” (Table 1). “Ongoing pregnancy” rates14,15 were extracted from trial data preferentially over “clinical pregnancy” rates.

Table 1 Transition probabilities

Mild–moderate and severe OHSS rates were obtained from Rettenbacher et al14 and Strowitzki et al15 (Table 2). It was assumed that cycle discontinuation/interruption due to OHSS was captured in the “no oocyte retrieval” or “no embryo transfer” states.

Table 2 Mild–moderate and severe OHSS event rates

A comparison between the Originator and both biosimilars together (“pooled biosimilars”) was also conducted. A simple methodology was employed to estimate the pooled efficacy data, whereby the numbers of patients in the Originator, Biosimilar 1 and Biosimilar 2 arms of the Rettenbacher et al14 and Strowitzki et al15 trials, were combined to create a “pooled biosimilars” arm and pooled Originator arm. This enabled a combined analysis of clinical outcomes for the Originator versus both Biosimilar 1 and Biosimilar 2 (Table 1).

Dosing

Dosing was determined according to three levels of response to ovarian stimulation; normal, hyper and poor responders (Table 3). It was assumed that women who were “normal responders”, defined as >9 and ≤15 oocytes, received the mean dose of each intervention; “hyper-responders”, defined as >15 oocytes, received the lower standard deviation of the mean dose; and “poor responders”, defined as <4 oocytes received the upper standard deviation of the mean dose, as reported in each publication.25,26 For the pooled biosimilars analysis, dosing for Biosimilar 2, as reported in Strowitzki et al, was used as a proxy for “pooled biosimilars”.15 It was also assumed that the duration of stimulation (number of days) was equal to the mean duration of stimulation, for response type. The proportions for normal, hyper- and poor responders (73%, 6% and 21%, respectively) were used to estimate a weighted mean dose for each treatment.27

Table 3 Daily dosing inputs for normal, hyper- and poor responders

Cost inputs

Cost inputs were categorized into assisted reproduction and birth costs, adverse event costs and drug costs.

Assisted reproduction and birth costs

Individual components and total costs estimated for each stage of the treatment cycle (preparation, oocyte retrieval, no oocyte retrieval, embryo transfer etc) are outlined in Table 4. In some instances, where the cost was dependent on the type of ART carried out (IVF or ICSI), the cost was weighted by the proportion of IVF (24%) and ICSI (76%) procedures carried out, according to the German IVF register 2016.1

Table 4 Unit cost: assisted reproduction and birth

It was assumed that the cost of “preparation” for an ART cycle was comprised of the cost of general treatment, the treatment plan and serological tests, as outlined in the Kassenärztliche Bundesvereinigung (KBV) (Table 4).28 Whilst patients also receive medications during preparation for ART, prior to the administration of gonadotropins for COS, it was assumed that there would be no differences in treatment between the Originator and biosimilars and, therefore, these costs were excluded from the analysis.

The cost of a live birth was assumed to be composed of the weighted average of vaginal and C-section births from the Fallpauschalen-Katalog, based on a reported proportion of 30.5% C-section births in Germany in 2016 (Table 4).29,30 The cost of a miscarriage was assumed to equal the cost for dilation and curettage, including anesthesia (Table 4).13

Adverse event costs

The cost components of mild–moderate and severe OHSS are outlined in Table 5. To mirror real-world practice in Germany, the base case analysis did not include the cost of vitrification or cryopreservation (egg-freezing) as part of the cost of severe OHSS, which can lead to cycle interruption. This is due to complexities in reimbursement of this procedure in Germany, which is normally self-funded.31

Table 5 Unit cost: mild to moderate and severe OHSS

Drug costs

The German cost of each strength of each intervention were obtained from Lauer-Fischer GmbH WEBAPO® InfoSystem, using the ATC-group G03GA class.6 In Germany, the cost of the Originator preparations is higher compared to the biosimilar preparations. The pharmacy-selling price (including value added tax) was used for all gonadotropins (Table 6). The final cost of each treatment was calculated as a weighted cost of the proportion of normal, hyper- and poor responders and the cost of the combination of vials required to achieve the normal, poor- or hyper responder dose (Table 7). The final total weighted cost for the Originator and Biosimilar 1 was €994.19 and €952.08 respectively. The final average total weighted cost for Originator and Biosimilar 2 was €1,114.06 and €891.83 respectively. For the pooled biosimilars analysis, dosing and unit costs were conservatively assumed to equal dosing and costs for Biosimilar 2, as this was the lowest cost biosimilar.

Table 6 Unit cost: gonadotropin vial

Table 7 Gonadotropin costs for normal, poor and hyper-responders for one fresh cycle based on daily dosing

Sensitivity analysis

One-way sensitivity analysis (OWSA) was conducted for all clinical and cost parameters by investigating the plausible upper and lower values from the reported outcomes. OWSA of cost input parameters was conducted by investigating outcomes around the upper and lower 25% variance of input parameters. Scenario analyses on model outcomes were also conducted by changing the proportions of responder-types to 100% normal responders, 100% hyper-responders and 100% poor responders.

Clinical expert validation

Clinical and cost inputs, model structure and methodology were validated by a German clinical expert with extensive experience in assisted reproduction in Germany.

Results

The results of each analysis are outlined in Figure 2 and Tables 810. Results indicate that the Originator is associated with a higher rate of live birth and a lower cost per live birth compared to Biosimilar 1, Biosimilar 2 and pooled biosimilars.

Table 8 Key clinical and cost-effectiveness results for Originator versus Biosimilar 1

Table 9 Key clinical and cost-effectiveness results for Originator versus Biosimilar 2

Table 10 Key clinical and cost-effectiveness results for Originator versus pooled biosimilars

Figure 2 Cost per live birth for Originator versus Biosimilar 1, Biosimilar 2 and pooled biosimilars.Notes: Biosimilar 1: Bemfola®, Gedeon Richter UK Ltd, London, UK. Biosimilar 2: Ovaleap®; CVC Capital Partners, Luxembourg.

Clinical outcomes

Following stimulation and one fresh embryo (non-frozen) transfer, the estimated live birth rate for the Originator was higher, compared to Biosimilar 1 (40.7% vs 32.1% respectively), Biosimilar 2 (32.2% vs 26.8% respectively) and the pooled biosimilars (36.0% vs 30.1% respectively).

Cost outcomes

The average total costs for women treated with the Originator were estimated to be higher than those treated with biosimilars: the Originator versus Biosimilar 1 (€4,272 vs €3,917), the Originator versus Biosimilar 2 (€4,053 vs €3,646), and the Originator versus pooled biosimilars (€4,207 vs €3,777). For each comparison, cost breakdown (gonadotropin costs, adverse event costs, assisted reproduction costs and birth costs) were reported as the average cost for patients treated with the Originator, Biosimilar 1 and Biosimilar 2. The estimated gonadotropin costs account for a small proportion of total costs in all treatment arms (23.3–27.5% for the Originator and 24.3%, 24.5% and 23.6% for the Biosimilar 1, Biosimilar 2 and pooled biosimilars respectively), compared to the sum of assisted reproduction and live birth costs.

Cost-effectiveness

Results suggested that the estimated average cost per live birth for women treated with the Originator are lower than those treated with biosimilars: Originator versus Biosimilar 1 (€10,510 vs €12,192); Originator versus Biosimilar 2 (€12,590 vs €13,606), and Originator versus pooled biosimilars (€11,676 vs €12,547). The Originator was associated with an ICER of €4,168, €7,540 and €7,256 versus Biosimilar 1, Biosimilar 2 and pooled biosimilars respectively.

Sensitivity analysis

OWSA for incremental live births of the Originator versus the biosimilar products, indicated that model results were most sensitive to the probability of pregnancy for all interventions. Other key drivers included the probability of embryo transfer and the probability of live birth for all interventions. Scenario analyses varying the proportions of responder-types had minimal impact on the overall results, suggesting the robustness of the model outcomes.

Discussion

This study investigated the cost and clinical outcomes of the Originator in comparison to Biosimilar 1, Biosimilar 2 and pooled biosimilars, from a German payer perspective. Biosimilar follitropin alfa preparations have demonstrated non-inferiority to their reference medicinal product, the Originator, in terms of oocyte retrieval.14,15 However, the impact on live birth rates and costs associated with the entire treatment have not yet been established. The results of this study indicated that in Germany the Originator is associated with a higher live birth rate and a lower cost per live birth compared to Biosimilar 1 and Biosimilar 2 (Figure 2).

Previous publications comparing the Originator to Biosimilar 1 and Biosimilar 2 have concluded comparability based on the number of oocytes retrieved, the primary endpoint recommended by the EMA).14,15,21 While there is no meaningful difference in the number of oocytes retrieved between originator and biosimilar products, no assessment of the qualitative difference and how this affects other outcomes, such as live birth, has been undertaken. The clinical end-point of this analysis was the rate of live birth, which, as stipulated by the participants at the Harbin Consensus Conference, is the preferred primary outcome for all clinical trials of treatment for infertility.32 Whilst comparing the number of oocytes may be an effective measure of in-vivo efficacy, the live birth rate is a more clinically meaningful measure to payers, patients and IVF specialists.2,16 In the biosimilars trials, live birth was not shown to be similar, although neither study was adequately powered to detect this outcome. However, in a post-hoc analysis of the Rettenbacher14 and Strowitzki15 trials, the data reported in the EMA public assessment were pooled and analysed using an additive logistic regression model and maximum likelihood estimate, showing live birth rates of 35.8% for Gonal-f versus 30.3% for the pooled biosimilars (p=0.034).33 The incremental live birth rate for the Originator compared to Biosimilar 1, Biosimilar 2 and pooled biosimilars based on clinical trial results is 8.5%, 5.4% and 5.9%, respectively. When translated into a potential real-world setting, where a cohort of 1,000 women undergo COS as a part of ART, treatment with the Originator may result in 59–85 more live births compared to biosimilars. The difference in the live birth rate may be explained by variations in the structural profiles and manufacturing processes of the biosimilar and reference product, potentially leading to variations in FSH receptor activation and thus biological activity, as investigated by Mastrangeli et al20.

Total costs, including gonadotropins but excluding other ART medications, for one fresh cycle of assisted reproduction (IVF/ICSI) were estimated to range between €4,053–€4,272 for the Originator and €3,777–€3,646 for biosimilars. These estimates are similar to a previous estimate by Rauprich et al, which estimated the cost of a standard IVF cycle in Germany, including medication, to be about €3,000 and an ICSI to be about €3,600 in 2008.3 Our findings suggested that gonadotropin costs may account for a smaller proportion of total costs compared to the combined cost of assisted reproduction and birth. In our model, total costs were largely driven by the average birth costs, which accounted for 29–35% of total costs.

It was found that the estimated average cost per live birth is lower for the Originator versus Biosimilar 1 (€10,510 versus €12,192) and Biosimilar 2 (€12,590 versus €13,606). An additional analysis using the pooled data from both biosimilar trials confirmed the individual analysis for the Originator versus Biosimilar 1 and Biosimilar 2 (€11,676 versus €12,547). In our analysis, the ICER for the Originator was estimated to be €4,168, €7,540 and €7,256 versus Biosimilar 1, Biosimilar 2 and the pooled biosimilars respectively.

The results from this study are in line with previous cost-effectiveness analyses of follitropin alfa products. Silverio et al (2015) estimated the cost-effectiveness of the Originator versus Biosimilar 1 over one treatment cycle in Portugal. The cost per live birth was estimated to be lower for the Originator in comparison with Biosimilar 1, at €7,534.49 versus €9,205.31, respectively.34 Gizzo et al (2016) estimated the cost-effectiveness of the Originator compared to Biosimilar 1 over two treatment cycles in Italy and Spain. The cost per live birth was also estimated to be lower for Originator in Italy and Spain, €7,044 and €12,283 respectively, compared to €7,411 and €13,494 for Biosimilar 1.23 Like the analysis presented in the current study, the analyses by Silverio et al (2015) and Gizzo et al (2016) were based on clinical evidence reported by Rettenbacher et al14. Gizzo et al (2016) acknowledged that Rettenbacher et al14 was not powered to demonstrate the live-birth rate, in addition to other study limitations, such as the use of data reported in the literature.

In another study, Gizzo et al (2018) estimated the cost-effectiveness of the Originator compared to Biosimilar 2, based on live birth rates reported in Strowitzki et al15. Gizzo et al (2018) also reported a lower cost per live birth for the Originator versus the Biosimilar 2 in three countries (Germany €8,135.04 versus €9,185.34; Italy €8,545.22 versus €9,733.37; Spain €14,859.53 versus €17,767.19).22 Similarly, Silverio et al (2016) estimated the cost-effectiveness of the Originator versus the Biosimilar 2 in Portugal, based on data from Strowitzki et al15. The authors found that in Portugal, the Originator was also associated with a lower cost per live birth (€9,391.67), compared to Biosimilar 2 (€10,977.42).35

A German study in 2008, estimated the cost per live birth to be approximately €15,000.3 These costs are in line with the current study estimates for the cost per live birth, which were estimated to range between €10,510 - €12,590 for the Originator and €12,192, €13,606 and €12,547 for Biosimilar 1, Biosimilar 2 and pooled biosimilars respectively.

The authors of the current study acknowledge that the results obtained in this study are subject to some limitations, primarily related to a lack of clinical trial data or real-world evidence. This analysis compared the Originator to each biosimilar over one ART cycle rather than over multiple cycles, as often occurs in real-world practice. However, given that live birth rates decline for repeated cycles of ART,1 it was thought that in the absence of data to inform the probability of subsequent live birth rates, extrapolating the available evidence over successive cycles would be misleading. Related to this, due to a lack of data reported in the trials for Biosimilar 114 and Biosimilar 2,15 it was not possible to account for the patients who discontinued or interrupted a cycle due to OHSS. To overcome this limitation, the authors assumed that these patients would be accounted for in the “no oocyte retrieval” of “no oocyte embryo transfer” states. Another limitation relates to the studies by Rettenbacher et al14 and Strowitzki et al,15 which were not designed or powered to assess live birth rates. Several of these limitations could be overcome by utilizing real-world evidence, mirroring efficacy in populations in countries of interest. As previously discussed, our current analysis is an exploratory one that is based on live-birth rates because this is a more valid endpoint for ART than the number of oocytes retrieved and is the only outcome that can be measured in terms of cost-effectiveness. In order for live birth rates to be considered as a primary outcome, a much larger sample size would be required, to achieve sufficient statistical power. However, in the absence of such publicly available data, implementing data as reported in the literature provides a measure of clinical efficacy and cost-effectiveness.

Conclusion

Within the limitations of this study, our results suggest that in comparison to Biosimilar 1 and Biosimilar 2, the Originator is associated with a higher live birth rate and a lower cost per live birth in Germany. This analysis therefore could carry implications on the perception of “value for money” with lower-cost biosimilar follitropin alfa preparations. This study was based on the only efficacy and safety data currently available for the biosimilars. We acknowledge that further research is required to validate our results, with studies using real-world data and adequate power to detect the significance of these findings.

Acknowledgment

This study was financially supported by Merck KGaA.

Author contributions

WX, AL and EF were responsible for the creation of study documents, data analysis, data interpretation, and writing of the manuscript. All authors contributed to data analysis, drafting and revising the article, gave final approval of the version to be published, and agree to be accountable for all aspects of the work.

Disclosure

WX, AL and EF are employees of IQVIA, London, UK and CR and RP are employees of Merck KGaA. KB has received honoraria from Merck. WX reports personal fees from MSD, Teva, and Ferring, during the conduct of the study; AL reports grants from Merck KGaA, during the conduct of the study; grants from Merck Inc, Ferring, and Teva, outside the submitted work; EF reports personal fees from Merck KGaA, during the conduct of this study; CR is a consultant for Merck. The authors report no other conflicts of interest in this work.

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