An ever-evolving landscape: an update on the rapidly changing regulation and reimbursement of biosimilars in Canada

Published in: Volume 8 / Year 2019 / Issue 3
Category: Review Article
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Keywords: biosimilars, CADTH CDR, CADTH pCODR, Health Canada, INESSS, pCPA

Author byline as per print journal: Eric CK Siu, MSc, PhD; Anne Tomalin, BA, BSc; Kevin West, BA; Sandra Anderson, BA, MBA; George Wyatt, BSc, MBA

Abstract:
Since the introduction of the first infliximab biosimilar, Inflectra®, significant changes have taken place in the Canadian biosimilar landscape, and both the regulatory and the reimbursement processes have been streamlined. Biosimilars must first receive regulatory approval by Health Canada. The Canadian Agency for Drugs and Technologies in Health (CADTH) used to evaluate biosimilars for public payers outside Québec, but they do not do so anymore. The Institut national d’excellence en santé et en services sociaux (INESSS) will still review biosimilars in Québec, but INESSS is expected to use an expedited process so as not to create any delays. Once the public reviews have been completed, the pan-Canadian Pharmaceutical Alliance (pCPA) will negotiate pricing, the price of which will be transparent. The province of British Columbia became the first public jurisdiction in Canada to mandate switching from originators to biosimilars. The processes for private plan reimbursement are less complex. The changes that have been instituted work to ensure the sustainability of the Canadian healthcare system, by promoting faster and greater uptake of the lower-cost biosimilars, while ensuring high quality biological treatments remain accessible to patients. Furthermore, attitudes of Canadian physicians and patients have shifted towards the acceptance of biosimilars. The purpose of this paper is to provide an update on the current status of biosimilars in the Canadian context.

Submitted: 18 July 2019; Revised: 21 August 2019; Accepted: 21 August 2019; Published online first: 23 August 2019

Introduction

According to the latest report on Canadian prescription drug spending published by the Canadian Institute for Health Information (CIHI), public drug plan and private-sector spending was forecasted to reach CA$33.7 billion in 2018, an annual increase of ~4.3% [1]. In Canada, drug spending is typically split as public (~40%), private (~40%), and out-of-pocket expenses, e.g. premiums, deductibles: (~20%).

Biologicals are commonly prescribed therapies for the treatment of conditions ranging from diabetes to cancer [2-4], many of which are considered high-cost drugs. In 2017, public drug programmes spent CA$13.5 billion on prescription drugs, and biologicals accounted for 21.6% of that spending [1]. Antitumour necrotic factor (anti-TNF) drugs accounted for the highest proportion of public drug programme spending for the sixth consecutive year at 8.2% (nearly 38% of all biologicals), and were the fifth highest contributor to spending growth; however, anti-TNF drugs were only used by 0.5% of public plan beneficiaries [1]. In the private sector, seven of the top 10 selling high-cost drugs in 2017 were biologicals, with anti-TNF drugs accounting for 11% of the total drug cost [5].

The introduction of biosimilars (previously known as subsequent entry biologics in Canada) provides cost-savings to both public and private drug plans and individuals in an era of financial constraint. According to Canadian Agency for Drugs and Technologies in Health (CADTH), biosimilars of 15 reference biologicals have been launched, or are expected to be launched by 2020 [6]. Furthermore, many are biosimilars of the same reference bio- logical, thus there is a potential for intense competition in the biologicals space. For example, Health Canada has approved/is reviewing seven trastuzumab and two adalimumab biosimilars.

Since our last review, which covered the biosimilars launched in Canada to 2016, Omnitrope® (somatropin), Inflectra® (infliximab), Grastofil® (filgrastim), and Basaglar® (insulin glargine) [7], significant changes have occurred in the Canadian biosimilar environment. Of particular note are the changes in the regulatory and the health technology assessment (HTA) domains, many of which are designed to promote the uptake of biosimilars. This manuscript will highlight these new developments.

New developments in the regulatory framework for biosimilars

The initial Canadian regulatory guideline for biosimilars was published in 2010, shortly after Health Canada completed the review of the first biosimilar, Omnitrope. This review process provided the agency with the opportunity to gain the experience needed to validate the concepts and principles behind biosimilars [8]. Subsequently, in December 2015, Health Canada issued a stakeholder consultation process for a revised biosimilar guideline which was finalized in November 2016 [9]. Some of the key changes between the initial and new guideline were discussed in our previous review [7].

In addition to the new guideline, in September 2015, Health Canada also launched a three-year Scientific Advice Meeting pilot programme to provide drug manufacturers with the ability to discuss their biosimilar with Health Canada early in the development process [10]. However, at the time of this manuscript preparation, Health Canada had not provided any updates regarding this pilot project.

Regulatory Review of Drugs and Devices Initiative
Realizing the rapidly changing healthcare system, Health Canada recognized the need for a regulatory system that is more efficient, that supports the timely access to therapeutic products, and that allows better linkages within the healthcare system as a whole [11, 12]. As a result, Health Canada laid out a Regulatory Review of Drugs and Devices (also known as the ‘R2D2’) initiative in 2017 with a series of objectives: i) providing more timely access to drugs and devices, including orphan drugs/drugs for rare diseases; ii) making better use of real-world evidence to support regulatory decisions across a product’s life cycle for both drugs and medical devices; iii) modernizing its operation by increasing transparency and reducing tax-payer burden; and iv) implementing a plan to increase collaboration with both Canadian and international partners [11]. The last objective is particularly relevant for reimbursement: one of the key action items is for Health Canada to work with HTA organizations to reduce the time between regulatory approvals and public plan reimbursement recommendations (HTA is further discussed in the next section). Other action items within this collaboration objective includes Health Canada, and other Canadian health partners, working with international regulators to explore the idea of joint reviews, or the use of foreign reviews, to increase efficiencies and expertise in the review process, and to support access to products otherwise not available in Canada [11].

With the expected increase in new therapies seeking regulatory approval, Health Canada has created several projects that will facilitate the access of these products.

First, one such project was designed specifically to improve access to biologicals (biosimilars and non-biosimilars) by increasing the regulatory review capacity (expected to be fully in place as of the preparation of this manuscript). Ultimately, it is intended that the increased reviewing capacity will lead to a more secure supply of biological drugs with more than one manufacturer, more affordable biological drugs, and earlier access to new treatment options [13].

Second, to decrease the time between regulatory review to reimbursement, Health Canada and HTA organizations (CADTH [including participation by all Canadian federal, provincial, and territorial jurisdictions except the province of Québec; and INESSS in Québec) began to collaborate in 2018 in an aligned review process for all biological and pharmaceutical new drug submissions where the manufacturer intends to seek HTA process on a pre-NOC (Notice of Compliance) basis [14, 15]. This process initially also includes submissions for biosimilars, and new indications for existing drugs made to Health Canada. Prior to this initiative, manufacturers had the option to submit to the CADTH Common Drug Review (CDR) within 90 calendar days [16] prior to the anticipated date of receiving regulatory approval, i.e. pre-NOC submission. However, as part of the alignment process between Health Canada and the HTA organizations, a manufacturer has the opportunity, but not the obligation, to submit to CDR up to six months (or 180 days) before the anticipated date of regulatory approval [16, 17]. The CADTH pan-Canadian Oncology Drug Review (pCODR) has allowed a 6-month pre-NOC submission since its inception, reflecting the seriousness of the therapeutic area and the generally unmet need of improving survival of cancer patients. It is expected that the alignment of Health Canada review and HTA process will reduce duplication and reduce time lags between regulatory approval and reimbursement recommendation [14]. It is important to note that this process, in essence, only lengthens the pre-NOC submission threshold to HTA organizations: the duration of review by Health Canada and HTA organizations do not change and manufacturers must still remain compliant with all submission requirements. The typical Health Canada review timeframe for new drugs or new indications ranges from a target of 180 days for priority review to 300 days for a standard review. Finally, as part of the objective to improve transparency, products that have opted-in to the aligned review process as of 1 October 2018 would be publicly noted as such. Although this process is currently operational, it is expected that all parts of this project will be fully in place by Spring 2020 [18].

Third, Health Canada has also endeavoured to work with HTA organizations to provide concurrent scientific advice to manufacturers early in the drug development process. Currently, Health Canada and HTA organizations work independently to give scientific advice to drug manufacturers. Through this process, it is expected that Health Canada and the HTA organizations will help manufacturers to produce more relevant data from clinical trials to inform better decisions. As a result, this change has the potential to reduce access time to important medications. It is expected that all parts of this project will also be fully in place by Spring 2020 [19].

Initiatives taken to improve and hasten access to new medications are not unique to Canada. For example, European health authorities are becoming far more proactive with funding decisions for new medicines by starting activities well before likely a European Medicines Agency (EMA) approval is anticipated [20-22].

Naming of biologicals (biosimilars and non-biosimilars)
In early 2018, Health Canada and the Institute for Safe Medication Practices (ISMP) Canada conducted an online consultation on the naming of biological drugs. Several options where provided for discussion, including the random four-letter suffix convention that was instituted by the US Food and Drug Administration (FDA). Feedback from 362 respondents (62% from pharmacists and pharmacy-related organizations) showed that one-half do not accept the four-letter suffix option, and more than two-thirds found the current naming convention (brand name plus unique Drug Identification Numbers [DINs]) to be unacceptable for biologicals. Three-quarters of the respondents supported an updated convention of including both brand name and International Nonproprietary Name (INN), citing that this naming option would be compatible with their current practice or environment; would clearly identify products for prescribing, dispensing and tracking of adverse events (AEs); and would reduce the likelihood of confusion and errors for healthcare providers and patients [23]. As a result of the feedback, Health Canada intends to implement an updated naming convention for biologicals that include the product’s brand name, INN, and DINs [24]. It is expected that the updated naming convention will support the clear distinctions between biological drugs for the purpose of AEs tracking.

New developments in the HTA of biosimilars

Public drug plans make extensive use of HTA recommendations as part of the reimbursement decision making process. Eligible non-cancer prescription drugs approved by Health Canada are reviewed by CDR and INESSS [25, 26], and Health Canada approved cancer drugs are reviewed by pCODR and INESSS [26, 27]. Both the CADTH CDR and pCODR provide reimbursement recommendations that are considered by participating public drug plans outside of Québec, and INESSS makes recommendations to the Québec Government for drug reimbursement in that province. INESSS has extended its collaboration with CADTH through the Health Canada aligned drug review process [15].

In 2018, CADTH initiated new streamlined processes associated with CDR and pCODR that are a part of the CADTH 2018–2021 Strategic Plan [28]. However, in 2019, a significant change took place with regards to the role of CADTH in biosimilar reimbursement [29]. These changes are discussed below.

Common Drug Review (CDR)
CADTH released the first official CDR submission guidelines for biosimilars in March 2014 in anticipation of a new wave of biosimilars entering the Canadian market [7, 30]. This official guideline detailed extensive requirements for a biosimilar submission reflecting the cautious position that it took in the assessment of these products at that time.

CADTH’s approach towards biosimilars changed in 2018 with new submission requirements for biosimilars, as well as a new recommendation framework. In the summer of 2017, CADTH conducted a consultation with stakeholders to update the existing biosimilar evaluative process (CDR Update – Issue 125, released 1 August 2017) [31]. CADTH noted that Health Canada evaluated and approved biosimilars (and their extrapolated indications) based on the totality of evidence demonstrating similarity to the reference biologicals. As such, CADTH felt that a streamlined process would reduce duplication, optimize resources, and support the timely review of biosimilars. The key elements in the proposed revised procedure included a substantially reduced submission package; reduced submission fee; ineligibility for the optional pre-submission meeting; reduced evaluation timeframe (reduced to the targeted 44 to 53 business days from the typical ~180 calendar days); and the lack of deliberation of the dossier by the CDR Canadian Drug Expert Committee (CDEC) and therefore, no CDR recommendation issued, e.g. reimburse, do not reimburse, reimburse with criteria/condition, which is standard for most other submissions [32]. In place of the recommendation, a review record would be posted. Following the consultation process, a new CDR guideline for biosimilars was issued in February of 2018 [33].

Table 1 lists the biosimilar products that have been reviewed by the CDR. Between 2014 and 2017 there were very few submissions (two per year, and one was withdrawn in 2014), and each submission was associated with approximately six months of review time. In 2018, with the introduction of the streamlined process, there were four biosimilar submissions, and the evaluation time was reduced to approximately two months.

In a substantial change in mandate, CADTH announced in May 2019 that it would no longer review biosimilars via its CDR and pCODR (see below) programmes as of 1 June 2019 [29]. This also applied to biosimilar products where the review had been completed after 1 June 2019. CADTH’s reasoning for this decision included the fact that the biosimilar review process may delay access to new biosimilar treatments. In addition, the resources currently devoted to reviewing biosimilars could be diverted to other drug reviews and programme-related issues. CADTH also indicated that the organization’s workload has increased significantly and that biosimilar reviews do not add a lot of value for public drug plans. However, in rare circumstances, e.g. the reference product was not reviewed by CADTH or a drug plan, a CADTH review may still be required for a biosimilar (considered on a case-by-case basis with the drug plans). Although CADTH stated it would no longer review biosimilar submissions, it indicated that manufacturers should still submit their products to the public jurisdictions and the pCPA [29].
Considering public jurisdictions would potentially need to con- duct a more thorough review of biosimilars in the absence of a CADTH assessment, it is unclear how much quicker biosimilars would actually reach patients.

pan-Canadian Oncology Drug Review (pCODR)
The CADTH pCODR was much less active compared to the CDR in terms of biosimilar guideline development. This may have been due to the lack of oncology biosimilars entering the Canadian market at the outset. Indeed, the original pCODR guideline for biosimilars was not published until early 2018, at the same time as the revised CDR guideline [34]. Overall, despite the nature of the oncology therapeutic area, the formal submission requirements for oncology biosimilar molecules are highly similar to those for non-oncology biosimilar molecules. At the time of preparation of this manuscript, three biosimilars have been submitted to pCODR, see Table 1: Ogivri®, the BGP Pharma ULC (Mylan) trastuzumab biosimilar to Roche’s Herceptin®, currently under review; Mvasi®, the Amgen bevacizumab biosimilar to Roche’s Avastin®, listed by pCODR; and Pfizer’s bevacizumab.

Table 1Mvasi represents an interesting case: it was submitted for two of the Avastin approved indications (non-small cell lung cancer [NSCLC] and metastatic colorectal cancer [mCRC]); however, the Avastin approved indication for NSCLC was not recommended for reimbursement by the interim Joint Oncology Drug Review (iJODR; a precursor to pCODR) by public plans [35]. This was likely due to the lack of perceived therapeutic value as previously reported by INESSS on multiple occasions [36, 37]. In accordance to the updated CADTH guidelines, pCODR did not make a recommendation regarding the reimbursement of Mvasi for either indication. This effectively leaves the funding decision solely to the public payers. Mvasi is currently undergoing pCPA negotiation and it remains to be seen whether Mvasi will be funded for the NSCLC indication. As noted in the previous section, pCODR will no longer review biosimilars as of June 2019.

Institut national d’excellence en santé et en services sociaux (INESSS)
In Québec, INESSS has also instituted a significant change to the HTA process for biosimilars. Unlike CDR, INESSS did not have a biosimilar-specific guideline in place when the first biosimilars came to market. It was not until 2017 that INESSS developed its first set of requirements specific to biosimilars, although they were similar to other new drugs or drugs with new indications. In alignment with CDR, INESSS issued a set of streamlined requirements for biosimilars in 2018, which included the ability for manufacturers to submit to INESSS six months pre-NOC [17].

INESSS’ attitude on biosimilars has been historically more divergent compared to CDR. It was the first provincial jurisdiction to provide what could be considered a landmark positive recommendation on the reimbursement of the infliximab biosimilar, Inflectra [7]. On the other hand, INESSS originally issued a negative recommendation on the reimbursement of the filgrastim biosimilar, Grastofil, due to therapeutic value, despite Health Canada approval and the positive CDR recommendation [38, 39]. The impact of this recommendation on commercialization cannot be underestimated as the province of Québec accounts for nearly one-quarter of the Canadian population. Ultimately, Grastofil was recommended by INESSS for reimbursement in a subsequent evaluation well over one year later [40].

With the streamlined requirements, INESSS also released a new formal evaluation framework. Overall, the framework is in alignment with that of CADTH [41]. As of this writing, all biosimilar products that have received positive CDR recommendations have also received positive recommendations by INESSS. At the time of this writing, INESSS still requires submissions for biosimilars. It is expected that INESSS will continue to review biosimilars, but apply a more streamlined process, which may more closely follow the review it does for generic drugs.

New developments at the pan-Canadian Pharmaceutical Alliance (pCPA)

The pCPA was formally established in 2010 with the goal of combining purchasing power for public drug plans to improve access and increase cost-effectiveness of medications. It is interesting to note that several European countries are also attempting to combine multinational purchasing powers to reduce drug cost [42, 43].

In 2016, the pCPA issued the Subsequent Entry Biologics (SEBs) First Principles with the goal of developing a more comprehensive biosimilar policy framework [7, 44].

Since the release of the First Principles, the pCPA completed several negotiations involving biosimilars and received feedback on the First Principles from various stakeholders. As a result, the pCPA developed a series of options that could be considered for inclusion in the policy directions and processes that would govern how negotiations for biologicals would proceed. These options were presented in a consultation meeting that took place in April 2017, with the goal of receiving additional feedback from stakeholders. Taking into consideration the responses received from the consultations, the pCPA developed and released a set of Biologics Policy Directions that applied to pCPA negotiations in late 2018 [45]:

1. The pCPA is committed to a unified, pan-Canadian process governing how biological drugs, including biosimilars, will be considered for reimbursement by Canada’s publicly funded drug plans1.
2. Biological drugs will be considered on an individual basis, in their market context.
3. Negotiation for biosimilar drugs will begin in parallel with the HTA process.
4. Offers for biological drugs will be accepted at any time; however, offers for biological drugs currently reimbursed by public drug plans will not be discussed during the time that a corresponding biosimilar is under consideration by the HTA and pCPA processes.
5. Offers for biological drugs that seek to restrict or exclude biosimilar drugs will not be considered.
6. Offers for (1) biological drugs for which biosimilars are reimbursed, or (2) new biosimilar drugs will not be considered unless the offer includes a transparent list price reduction to the lowest public list price.
7. Tiered listings for biological drug products may be implemented in therapeutic areas where appropriate.
8. Switching of patients from a reference biological molecule to a biosimilar may be implemented.

1For the purpose of this policy, “Biologicals” include both biosimilar and non-biosimilar products.

Of note is point 3, negotiation for biosimilar drugs will begin in parallel with the HTA process. INESSS is still reviewing biosimilars, which means that the pCPA will conduct negotiations considering the HTA process. This may change as time goes on, and pCPA has advised that it is currently reviewing their policy. Another notable Policy Direction which has significant commercial impact relates to tiered listings (point 7). As per the pCPA, where a number of biological drug products exist in a therapeutic space, those biological drugs may be tiered, i.e. authorization for some name-brand biological drug products will be based on evidence that other products have used first, at the discretion of the reimbursing drug plan. At least one public jurisdiction has formally laid out a tiered biologicals reimbursement policy, the details of which are discussed in the next section. Whether increasing discounts will be implemented based on the number of existing biosimilars currently reimbursed, a model similar to traditional generics products, remains to be determined as more and more manufacturers enter the market with the same biosimilar. Furthermore, British Columbia has just announced a switching programme (point 8). This is discussed in the Provincial/Federal Formularies section.

Overall, the above set of Policy Directions guides the negotiations between drug manufacturers and the pCPA with the goal ‘to develop and pilot a clear and consistent pan-Canadian approach that encourages appropriate use of biologicals in sup- port of a common pCPA mandate to enhance patient access to clinically relevant and cost-effective drug treatment options’ [45]. However, policies beyond those associated with the pCPA, e.g. appropriate use of biologicals and uptake of biosimilars, will need further engagement with stakeholders beyond the pharmaceutical industry, such as patients and clinicians. Furthermore, implementation of the negotiated agreements between manufacturers and jurisdictions still remains subject to jurisdictional legislation and regulation, i.e. separate contracts are applied in each jurisdiction [45].

Partnership with Cancer Care Ontario
The Biologics Policy Directions & pCPA Negotiations paper applies to all biosimilars, non-oncology and oncology. However, the adoption of biosimilars in the oncology setting requires multiple considerations to maintain high quality care and patient outcomes, and provinces differ in their policy, reimbursement and delivery of cancer services in ways that may affect the consistent implementation of biosimilars across the country. Consequently, as part of its biosimilars strategy, the pCPA partnered with Cancer Care Ontario to develop the pan-Canadian Oncology Biosimilars Initiative in order to promote the uptake of biosimilars for cancer treatment and to ensure that the implementation and use of therapeutic oncology biosimilars are appropriate and cost-effective across Canada. To kick-start this initiative, a pan-Canadian Oncology Biosimilars Summit was held in November of 2018 [46]. Learnings from the implementation of biosimilars in other jurisdictions and therapeutic areas were shared with participants (patients, patient advocacy organizations, clinicians, healthcare administrators, and government officials) from across Canada. Based on the feedback received from the summit, the vision, goals, and revised strategic objectives of the Initiative have been clearly delineated, see Figure 1 [46].

Figure 1The strategic objectives informed the development of an Action Plan, which provides an overview of the anticipated pre-implementation steps to ensure the successful adoption of oncology biosimilars [46, 47]. Some of the pre-launch activities are already underway [47].

The Canadian milestones for biosimilars in the context of Health Canada, CADTH, INESSS and pCPA are summarized in Figure 2.

Figure 2
Overall, it can be seen that the journey of biosimilar products has evolved from a complex and time-consuming process, to a far more streamlined and efficient process. It is also evident that along with these changes, the time from regulatory filing to completion of pCPA negotiations could be substantially shortened for biosimilars (by approximately one year, see Figure 3).

Figure 3However, in order to realize the significant advantage offered by the new streamlined processes, submitters of biosimilars need to engage in this highly efficient process, which requires a keen understanding of all facets of the components involved from regulatory filing to pricing negotiations. The selection of a knowledgeable, integrated consultancy can provide significant benefits to the marketers of biosimilars that could result in accelerated speeds to market for their products.

Provincial/federal formularies

CDR/pCODR-participating jurisdictions typically rely on CDR/pCODR to provide HTA processes and recommendations of new pharmaceutical products (or new indications) including biosimilars, for their reimbursement decisions. In light of the change made of CADTH, manufacturers have to submit to these jurisdictions directly. This, although considered by CADTH to promote faster access to biosimilars, may require additional resources by both the public drug plans and the biosimilar manufacturer since the drug plans have additional requirements (and sometimes inter-jurisdictional differences) for products that are not eligible for CDR/pCODR assessments. It is unclear if public drug plans will institute (or revise, in British Columbia’s case) a separate set of processes for biosimilars. It is likely that we will see more developments in this space over the next year.

In an unprecedented move, British Columbia (BC), Canada’s most west- ern province, launched its Biosimilars Initiative on 27 May 2019 that promotes switching among a number of biologicals and biosimilars [48-50]. Specifically, in phase 1 of this initiative, patients that are on a select reference product/indication should be switched to the biosimilar during the transition period. At the end of the transition period, originator products would only be covered on a case-by-case basis. The Initiative is designed to increase uptake of biosimilars, which has lagged behind that of other OECD (Organization for Economic Co-operation and Development) nations. Additional comments on uptake are found in the next section. The savings associated with the use of biosimilars have been, and will be, used to lower premiums and co-pays for some BC residents and to provide budget room for new drugs. Although BC is currently the only province to require switching, the impact of this decision will be significant as the remaining provinces will likely follow suit. From the patients’ perspective, a careful coordination between prescribing physicians, pharmacists, and patient support programmes is necessary to ensure patients receive timely, as well as equal, services and access to the prescribed molecules in the form of biosimilars as with the originators.

Manitoba was the first Canadian province to publish a Tiered Biologics Reimbursement Policy [51]. The policy classifies molecules into Tier 1 (biosimilars or biologicals for which no biosimilars exist), and Tier 2 (biologicals for which no biosimilars exist), for any given indication, and also provides prescription restrictions. As an example, according to this policy, all biological-naïve patients must first be prescribed a Tier 1 product, and if the therapy fails, must be prescribed a second Tier 1 product. Only after the second failure can a Tier 2 product be prescribed. Beyond this tier classification, there is no preferential reimbursement of one biosimilar over another where multiple products of the same molecule exist. An important distinction here is that these products are all antibody-based molecules, and no switching is allowed between the reference biological and the biosimilar (or between different biosimilars) of the same molecule at this time. Other jurisdictions also have similar reimbursement schemes where biosimilars are preferentially reimbursed over the reference biologicals.

It is important to note that the Biosimilar Initiative for BC is not the same as automatic substitution or interchangeability. Currently, no jurisdictions have implemented policies to support interchangeability/automatic substitution. FDA has recently issued the finalized guidance for demonstrating the interchange- ability of biosimilars with their reference products [52]. How- ever, policy efforts for biosimilar and interchangeable products in the US are still ongoing [53]. It is likely that interchangeability will not play a role in Canada until the US finalizes its policy.

Savings and uptake

Estimates provided by Canada’s Patented Medicine Prices Review Board (PMPRB) suggested that in the third year following biosimilar entry, potential savings could range between 13%−43% for acute-use products, e.g. filgrastim, epoetin alfa, and 8%−43% for chronic-use products, e.g. infliximab, adalimumab [6]. The low estimates represent an average-uptake, low-discount scenario, and the high estimates represent a high-uptake, high-discount scenario [6]. Based on the latest publicly available list prices, the discounts offered by biosimilars launched post-2010 relative to reference products range from 17% (Grastofil) to 50% (Renflexis), see Table 2, although it is unclear what the confidential prices are for the reference biologicals. Interestingly, the first biosimilar, Omnitrope (launched several years before Inflectra), had prices that ranged from more costly to less costly relative to the reference product, Genotropin, see Table 2.

Table 2This could be due to a drop in the price of the reference product. Despite the potential to generate significant savings, the uptake of biosimilars (with the exception of Grastofil) in Canada have been modest [6, 54-57]. Indeed, Canada is significantly behind in terms of adopting biosimilars compared to many OECD countries, e.g. the adoption rate for biosimilar infliximab was 1% in Canada in 2016 versus 82% in Norway, and 90% in Denmark in 2015 [46].

CADTH published a report in October 2018 regarding the mechanisms that various international jurisdictions utilize to pro- mote biosimilar uptake, which can be broadly categorized into supply-side policies and prescribing incentives. Educational and awareness initiatives were also identified at the national or organization level to facilitate biosimilar utilization. Overall, no specific mechanisms that would support the uptake of biosimilars in Canada were proposed by CADTH due to a myriad of factors [58]. Additional information regarding policies for promoting biosimilar uptake can be found in a separate publication [59].

In a biosimilars forum hosted by the Institute of Health Eco- nomics (IHE) in March 2017, key stakeholders from the public and private sectors, as well as clinicians, academics, and patient and provider associations gathered to ‘understand options to categorize and consider biosimilars, as well as a process to engage stakeholders to identify place in therapy and further evidence development that may be required’, and to ‘identify an approach to knowledge exchange that will enable a common view and shared agreement amongst patients and clinicians regarding appropriate and intended use of biosimilars’, based on the biosimilar experience from NHS Scotland [55]. One of the take-aways from this forum that is relevant to increasing biosimilar uptake, revolved around the need to achieve a healthy co-existence and competition among all biological agents, which would help to facilitate cost-savings and achieve continued product innovation. Specifically, this could include the reduction in time to market for biosimilars and better mechanisms for fostering competition and achieve sustainable cost-savings. As discussed previously, processes continue to be streamlined, which could significantly decrease the time for biosimilars to reach patients. However, more appropriate mechanisms that manage the adoption/utilization of biosimilars (beyond preferential reimbursement) may be needed to achieve such an objective.

Another potential mechanism to promote uptake involves switching, and this relates to the issue of therapeutic equivalence, which was discussed during the pCPA consultations [45]. Overall, the industry is supportive of Health Canada’s position on switching, that is, the decision to switch a patient being treated with a reference biological to a biosimilar should be made by the treating physician in consultation with the patient; and should take into account available clinical evidence and any policies of the relevant jurisdiction. How- ever, considering that current jurisdictions, i.e. provincial, territorial, and federal plans, do not have policies that support interchangeability for biosimilars (unlike oral generic drug products), and also have reimbursement criteria that do not clearly promote switching, the onus for this decision rests on physicians and patients. An example relating to the latter point can be seen from the Manitoba Tiered Biologics Reimbursement Policy [51]. Specifically, it is stated that patients cannot be switched from branded infliximab or etanercept products to other infliximab or etanercept products, i.e. biosimilars, if they have ‘previously trialed and deemed unresponsive to therapy’. What this means is that there is a potential opportunity to switch from a reference product to the biosimilar product, if patients are responsive to the reference product. A key challenge associated with the decision to switch from the reference product to a biosimilar is associated with the confidence of both physicians and patients. In the IHE forum, it was suggested that through NHS Scot- land’s experience, therapeutic monitoring of outcomes, e.g. collecting real-world evidence, achieved with biologicals was key to physician and patient confidence. This is an important driver for acceptance and utilization of biosimilars, and for better and more appropriate utilization of biologicals in general, that should be considered and implemented as part of routine care rather than in the context of research [55]. Clearly, availability of real-world evidence not only increases physician/ patient confidence; but could also be supportive of the pCPA Policy Directions and the pan-Canadian Oncology Biosimilars Initiative on switching [45-47]. It will also be supportive of the Health Canada Regulatory Review of Drugs and Devices (R2D2) initiative for real-world evidence to identify opportunities for enhanced use of real-world evidence throughout the drug life cycle [11, 60].

The availability of resources to support education and to pro- vide services that support patient care, e.g. treatment optimization and adherence, are the typical initiatives of well-resourced reference biological manufacturers. Manufacturers, and even physicians, believe that molecules should be considered in com- bination with the added services that are offered when assessing value [45, 55], and that competition should not be solely based on the price of the molecule alone. Therefore, the availability of similar services by biosimilar manufactures should enable increased uptake of biosimilars [55, 56]. While the provision of these services may be feasible for reference biological manufacturers, this may not be the case for biosimilar manufactures for a variety of reasons. In response to this challenge, Biosimilars Canada, an industry association, has recently developed a centralized patient support service platform that allows biosimilar manufacturers to leverage common resources to provide the support services needed for their patients [61]. This could facilitate the market entry of additional biosimilar manufacturers and is a model other jurisdictions may consider to manage the challenges of bringing a biological to market in a competitive marketplace with barriers of entry set high by innovator offerings.

Substantial efforts are taking place to promote the uptake of biosimilars. The prime examples from international jurisdiction highlight the fierce competition for market share. In 2015, Orion offered a 69% discount for biosimilar infliximab compared to the originator Remicade’s tender price in Norway [62], which is far more substantial compared to the typical discount of 15%−30% for biosimilars [63]. Other manufacturers have provided significant discounts in other jurisdictions [64].

Private payers

Private insurers have raised concerns about the ever-increasing number of high-cost drugs entering the market. The ability of plan sponsors to continue to provide coverage for high-cost drugs through private insurers is being challenged. For instance, Canada is second to the US in terms of the percentage of biologicals as a portion of all prescriptions, which increased from 8.3% in 2013 to 21.2% in 2017 [65]. With the launch of Inflectra in 2016, some private insurers provided preferential coverage of the biosimilar over the reference product for naïve patients [7]. Since that time, in what could be considered as a pivotal step for the Canadian private insurance industry, the private payer/adjudicator, Green Shield Canada, completed the pilot phase of a Biosimilar Transition Program, an initiative designed to allow for the voluntary switching of patients currently being treated with the reference products Remicade or Enbrel, to the corresponding biosimilar products. Development of this programme was based on emerging clinical evidence (including the landmark NOR-SWITCH study [66], and was done in consultation with a Canadian patient organization. Overall, 41% of participants voluntarily switched from the reference product to the biosimilar, and 26% stayed on the reference biological but were reimbursed at the biosimilar level. Nine per cent stayed on the reference biological due to valid clinical reasons, and only 3% switched to completely different molecules. Twenty-one per cent had not yet submitted claims. Through this programme, it was shown that an average savings of CA$8,500 per member per year was realized for the population participating in the pilot. As a result of this outcome, the Biosimilar Transition Program has been opened to all plan sponsors [57]. Importantly, this programme could also potentially provide real-world evidence on the safety and efficacy of switching from a Canadian perspective that could further promote biosimilar uptake by both private and public payers.

Physicians and patients

As with any new therapies, concerns are always raised regarding their safety and efficacy, and there was no difference when the first infliximab biosimilar was launched [7]. Since that time, the attitudes of some physicians and patients towards biosimilars have become substantially more receptive. For example, in 2012, the Ontario Rheumatology Association (ORA) was cautious regarding its recommendation of the use/implementation of biosimilars [67]. However, in the most recent position statement issued in 2018, the ORA openly supported non-medical switching from reference products to biosimilars [68].

Furthermore, a national patient-led organization, Arthritis Consumer Experts, is supportive of switching [69]. Payers and biosimilar manufacturers continue to emphasize education for physicians and patients to help them better understand biosimilars.

Summary

Significant changes have taken place in the Canadian regulatory and reimbursement environments for biosimilars since the launch of Inflectra, with many of these efforts and policies developed, e.g. the requirement of patients to switch to biosimilars in the BC, to further promote the uptake of biosimilars. As Canadian prescribers, patients and payers gain more confidence with biosimilars through accumulation of real-word safety and efficacy evidence, the promise of savings offered by these products may be fully realized. These savings are important to help sustain the healthcare system, and to provide resources for new medications in Canada. And, changes are likely to continue.

Acknowledgements

The authors would like to acknowledge France Lelievre, PharmAcce FDL, for her valuable input and Roberta Wood, Senior Medical Writer, Innomar Strategies, for her professional review of this manuscript. No funding was received for the preparation of this manuscript. The material contained in this manuscript has not been presented at conferences.

Competing interests: Eric CK Siu, Anne Tomalin, Kevin West, Sandra Anderson, and George Wyatt are all employees of Innomar Strategies. Innomar Strategies is a consulting firm that has business dealings with both originator and biosimilar manufacturers. No consulting fees were accepted relating to the current work. The authors have no other conflicts of interest to declare.

Provenance and peer review: Not commissioned; externally peer reviewed.

Authors

Eric CK Siu1,4, MSc, PhD
Anne Tomalin2, 4, BA, BSc
Kevin West3,4, BA
Sandra Anderson4, BA, MBA
George Wyatt1,4, BSc, MBA

1InnomarConsulting
2TPIreg
3HealthForward
4Innomar Strategies, Oakville, ON, L6L 0C4, Canada

References pending to upload

Author for correspondence: Eric Siu, Senior Manager, InnomarConsulting, Innomar Strategies, 3470 Superior Court, Oakville, ON L6L 0C4, Canada

Disclosure of Conflict of Interest Statement is available upon request.

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