Eupraxia’s EP-104 product candidate aims to achieve such an extended-release profile for FP. EP-104 is designed to prevent early peak concentrations associated with side effects and extend the duration of FP residence time in the intended area of administration to achieve prolonged activity. A key feature differentiating EP-104 from other extended-release IA corticosteroid formulations is that more than 90% of EP-104 is the active investigational drug product, compared to less than 20% in other products. Notably, the biocompatible PVA polymer in EP-104 is known to not release acidic by-products.
FP is not currently approved for use in any formulation for the treatment of symptoms in either OA or EoE. To the Company’s knowledge, EP-104IAR and EP-104GI are the only extended-release formulations of FP in development for these conditions. Management believes that its drug delivery technology platform has the potential to be an effective treatment for OA based on the proven efficacy of other corticosteroids for this condition. The drug delivery technology platform also has the potential to have a beneficial application for EoE, given the already-established efficacy of oral immediate release of FP in this indication. The potential for successful treatment of OA and EoE with the Company’s proprietary formulations of EP-104 is further supported by a long-standing and continually expanding library of data supporting the value of extended-release steroids.
EP-104IAR for Osteoarthritis
OA is a chronic progressive disease characterized by deterioration of joint cartilage and inflammation,3 which results in pain and stiffness, usually in the morning or after a period of inactivity; and loss of joint function which limits daily activities. In normal joints, cartilage acts as a cushion between bones and provides a smooth gliding surface for movement.4 In OA, the inflammatory processes integral to disease progression damages the cartilage, and over time cartilage wears away, causing bone to rub directly against bone resulting in joint damage, severe pain and disability.5
Globally, OA is the leading cause of disability in older adults.6 Estimates of prevalence and incidence vary according to the definition of OA used (i.e., radiographic (X-Ray) versus symptomatic) and the joints assessed. Approximately 10-15% of all adults over the age of 60 have some form of OA, with the knees being the most commonly affected joints. In addition, approximately 70% of OA patients have bi-lateral (both knees) disease. Knee OA is a leading cause of lower extremity disability in the developed world7,8 OA is estimated to affect more than 30 million patients in the United States alone,8 including an estimated 14 million people with symptomatic knee OA.9 It is also often associated with depression and loss of sleep which can greatly affect quality of life, causing further impact on the public health system.
Current evidence-based OA treatment guidelines aim to manage signs and symptoms, with the goal of slowing progression if possible. Recommended pharmacological interventions include topical and oral non-steroidal anti-inflammatory drugs, and IA corticosteroids. IA corticosteroid injections have been used for decades to manage pain and stiffness associated with inflammation in knee OA and have been approved by regulatory authorities as safe and effective.10 However, IA corticosteroid injections often result in suboptimal patient outcomes due to their short duration of activity and systemic side effects such as flushing, glucose alterations and cortisol suppression due to the high peak exposures required to maintain efficacious concentrations for prolonged durations. Evidence is also emerging regarding the risk of adverse joint findings and/or OA progression following frequent/repeated immediate release IA corticosteroid injections.11
3 Chow, Y.Y., Chin, K.Y. The Role of Inflammation in the Pathogenesis of Osteoarthritis. Mediators of Inflammation, 2020, DOI: 10.1155/2020/8293921.
4 Michael, J.W.P; Schluter-Brust, K.U.: Eysel, P. The Epidemiology, Etiology, Diagnosis, and Treatment of Osteoarthritis of the Knee. Dtsch Arztebel Int. 2010, 107(9): 152-62. DOI: 10.3238/arztebl.2010.0152.
5 Sinusas, K. Osteoarthritis: Diagnosis and Treatment. Am Fam Physician. 2012, 85(1): 49 – 56.
6 WHO Department of Chronic Diseases and Health Promotion. Available at: http://www.who.int/chp/topics/rheumatic/en/.
7 Cross, M, et al. The global burden of hip and knee osteoarthritis: estimates from the Global Burden of Disease 2010 study. Ann Rheum Dis. 2014, 73 :1323 – 1330. DOI: 10.1136/annrheumdis-2013-204763.
8 Osteoarthritis Fact Sheet. Centers for Disease Control and Prevention. Available at www.cdc.gov/arthritis/basics/osteoarthritis.htm. Accessed January 10, 2019.
9 Vina, E.R.; Kwoh, C.K. Epidemiology of osteoarthritis: literature update. Curr Opin Rheumatol. 2018, 30(2):160 – 167. DOI:10.1097/BOR.0000000000000479.
10 Bellamy N. et al. Intraarticular corticosteroid for treatment of osteoarthritis of the knee (Review). Cochrane Database of Systematic Reviews 2006, Issue 2. Art. No.: CD005328. DOI: 10.1002/14651858.CD005328.pub2.
11 McAlindon T.E., et al. Effect of intra-articular triamcinolone vs saline on knee cartilage volume and pain in patients with knee osteoarthritis: a randomized clinical trial. JAMA. 2017. 317(19):1967 - 1975. DOI: 10.1001/jama.2017.5283.
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