Biosimilars in Oncology: Latest Trends and Regulatory Status

Biologic-based medicines are used to treat a variety of diseases and account for around one-quarter of the worldwide pharmaceutical market. The use of biologic medications among cancer patients has resulted in substantial advancements in cancer treatment and supportive care. Biosimilar medications (or biosimilars) are very similar to the reference biologic drugs, although they are not identical. As patent protection for some of the most extensively used biologics begins to expire, biosimilars have the potential to enhance access and provide lower-cost options for cancer treatment. Initially, regulatory guidelines were set up in Europe in 2003, and the first biosimilar was approved in 2006 in Europe. Many countries, including the United States of America (USA), Canada, and Japan, have adopted Europe's worldwide regulatory framework. The use of numerous biosimilars in the treatment and supportive care of cancer has been approved and, indeed, the count is set to climb in the future around the world. However, there are many challenges associated with biosimilars, such as cost, immunogenicity, lack of awareness, extrapolation of indications, and interchangeability. The purpose of this review is to provide an insight into biosimilars, which include various options available for oncology, and the associated adverse events. We compare the regulatory guidelines for biosimilars across the world, and also present the latest trends and challenges in medical oncology both now and in the future, which will assist healthcare professionals, payers, and patients in making informed decisions, increasing the acceptance of biosimilars in clinical practice, increasing accessibility, and speeding up the health and economic benefits associated with biosimilars.

Biosimilars in oncology: key role of nurses in patient education

Biosimilars have the potential to lower costs and increase patient access to life-saving cancer therapies. However, lack of familiarity with biosimilars can be a barrier to their adoption, limiting their health and economic benefits. As highly trusted healthcare providers, nurses play integral roles in patient education. This review aims to help prepare nurses to respond to potential questions from patients on biosimilars. The regulation, use and potential benefits of biosimilars are discussed, with a focus on biosimilars in oncology. Overall, biosimilars are highly regulated medicines that provide comparable benefits to available biologics. Nurses can influence the adoption of biosimilars through patient education and can impact the future of the field in their expanding roles within health care systems.

Biosimilars in supportive care

PURPOSE OF REVIEW

This review covers recent publications relating to the use of biosimilar medicines in the supportive care of cancer patients, and broader publications focussed on the benefits and challenges of implementing biosimilars into clinical practice.

RECENT FINDINGS

A metaanalysis and a number of systematic literature reviews have confirmed that the safety and efficacy of biosimilar versions of epoetin-α, filgrastim and infliximab are equivalent to those of their corresponding reference biologics. New guidelines have been issued concerning the interchangeability of biosimilars and the practice of substituting a biosimilar in place of a prescribed reference product. The introduction of biosimilars into a health system has been shown to improve patient access to treatment while also delivering cost savings, however, there are a number of barriers that can prevent or delay the adoption of biosimilars into clinical practice which must be overcome for the potential benefits of biosimilars to be realized.

SUMMARY

There is a large amount of data to demonstrate that supportive care biosimilars are well tolerated and effective, with over 10 years of experience in Europe. We can learn from the challenges faced when introducing biosimilars into supportive care to facilitate the introduction of newer biosimilars into the treatment setting.

A consensus statement on the use of biosimilar medicines in hematology in Australia

Despite their availability for over a decade, the exact nature of biosimilar medicines is still poorly understood with paucity of clear treatment guidelines for their use in clinical practice in Australia. Although hematologists have had experience with biosimilars in the setting of supportive care, with the approval of the first biosimilar rituximab in hematological malignancies, it is important to revisit this topic. To inform the use of biosimilar medicines in clinical practice, we have developed a consensus statement from an Expert Panel of Australian hematologists, oncologists, and cancer pharmacists. These recommendations address the approach to use of biosimilar products in place of the corresponding reference medicine in a number of different clinical contexts. Our recommendations are based on the premise that biosimilar medicines can be considered therapeutically equivalent to their reference brand and used in a similar way to the reference product in any approved indication. We advocate for local approaches to the provision of patient information, dispensing of the intended brand and pharmacovigilance, to be developed in consultation with local hematologists and aim to improve confidence in the appropriate use of biosimilar medicines and their expected outcomes among hematologists.

Pharmacist perspectives and considerations for implementation of therapeutic oncology biosimilars in practice

Purpose

An overview of therapeutic oncology biosimilars, the U.S. biosimilars regulatory pathway, and the clinical development of selected biosimilar products is provided, including discussion of considerations in adopting biosimilars into oncology practice.

Summary

Biosimilars are biologic agents that are highly similar to and have no clinically meaningful differences from an approved reference product in terms of safety, purity, and potency. There is a large market for cancer biologics, and approval of biosimilars has the potential to increase access to care and reduce costs. An abbreviated regulatory pathway for the development and approval of biosimilars defines a stepwise approach to demonstrating biosimilarity and conducting clinical comparative trials to confirm equivalent pharmacokinetics, efficacy, safety, and immunogenicity to the reference product. Three therapeutic biologics (bevacizumab, trastuzumab, and rituximab) have been used extensively in the treatment of a variety of cancers and are targets for biosimilar product development. Preclinical and clinical experience with 2 recently approved biosimilars to bevacizumab and trastuzumab is reviewed. Challenges faced by pharmacy and therapeutics committees when considering oncology biosimilars for formulary inclusion are discussed.

Conclusion

Increased adoption of biosimilars could potentially lower treatment costs and improve access to biologics for patients with cancer. Key considerations in formulary review of biosimilars include the quality and quantity of data from comparative clinical trials, economic factors, manufacturer reliability, and challenges associated with incorporating biosimilars into practice.