FP, although approved by the FDA, Health Canada, EMA and other regulatory agencies, 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 the EP-104 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 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 a 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. The global prevalence of knee OA is estimated at approximately 23% in adults over the age of 40.7 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 IAR corticosteroids. IAR 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, IAR 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 IAR 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 Centers for Disease Control and Prevention, A National Public Health Agenda for Osteoarthritis: 2020 Update. http://www.cdc.gov/arthritis/docs/oaagenda2020.pdf.
7 Cui A, Li H, Wang D, Zhong J, Chen Y, Lu H. Global, regional prevalence, incidence and risk factors of knee osteoarthritis in population-based studies. EClinicalMedicine. 2020 Dec 1; 29:100587.
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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