Soligenix Completes Phase 1 Clinical Study with SGX203 for the Treatment of Pediatric Crohn's Disease

Princeton, NJ - June 28, 2013 - Soligenix, Inc. (OTCQB: SNGX) (Soligenix or the Company), a clinical stage biopharmaceutical company focused on developing products to treat inflammatory diseases and biodefense countermeasures where there remains an unmet medical need, announced today that it has enrolled and treated all patients in the Phase 1 Study BDP-PCD-01; the first clinical study for development of SGX203 (oral beclomethasone 17,21-dipropionate or oral BDP) for the treatment of pediatric Crohn's disease. The SGX203 development program has previously received Fast Track and Orphan Drug designations from the US Food and Drug Administration (FDA) for oral BDP as a treatment for pediatric Crohn's disease.
 
The objective of Study BDP-PCD-01, entitled "A Phase 1 Pharmacokinetic/and Young Adults", was to further characterize the pharmacokinetic (PK) and pharmacodynamic (PD) profile of the Company's unique proprietary oral BDP formulation. The study in healthy male and female adolescents and young adults provided important complementary data to that previously obtained, to enable the refinement of the PK model that is fundamental to the pediatric Crohn's disease development program. In addition, the study confirmed the safety profile observed in all previous clinical studies with oral BDP.
 
This study enrolled 24 subjects between the ages of 18-22, with all assessments completed in May 2013. Preliminary PK results indicate that the PK profile in this population is consistent with the profile established in previous studies in a broader population and supports a convenient twice a day dosing regimen. SGX203 administration (6 mg BDP twice daily over 7 days) was found to be safe and well-tolerated.
 
"We have designed this program in collaboration with an expert in PK modeling and simulation, Jeffrey S. Barrett, PhD, FCP, from The Children's Hospital of Philadelphia," stated Kevin J. Horgan, MD, Senior Vice President & Chief Medical Officer of Soligenix. "The PK data generated from this study will be used to refine the PK model we have established with Dr. Barrett. The refined model will provide the justification for limited PK sampling in the subsequent Phase 2/3 pediatric clinical study and will help inform the dose selection for the Phase 3 component of the study. The use of PK data in this way reflects the current state of the art in pediatric drug development, leveraging the maximum amount of information from the enrolled subjects."
 
About Pediatric Crohn's Disease
 
Crohn's disease is an ongoing disorder that causes inflammation of the GI tract. Crohn's disease can affect any area of the GI tract, from the mouth to the anus, but it most commonly affects the lower part of the small intestine, called the ileum. The swelling caused by the disease extends deep into the lining of the affected organ. The swelling can induce pain and can make the intestines empty frequently, resulting in diarrhea. Because the symptoms of Crohn's disease are similar to other intestinal disorders, such as irritable bowel syndrome and ulcerative colitis, it can be difficult to diagnose. People of Ashkenazi Jewish heritage have an increased risk of developing Crohn's disease.
 
Crohn's disease can appear at any age, but it is most often diagnosed in adults in their 20s and 30s. However, approximately 30% of people with Crohn's disease develop symptoms before 20 years of age. It is estimated, based upon review of historic published studies and reports and an interpolation of data on the incidence of Pediatric Crohn's disease, that Pediatric Crohn's disease is a subpopulation of approximately 80,000 patients in the US with a comparable number in Europe. Crohn's disease tends to be both severe and extensive in the pediatric population and a relatively high proportion (~40%) of pediatric Crohn's patients have involvement of their upper gastrointestinal tract.
 
Crohn's disease presents special challenges for children and teens. In addition to bothersome and often painful symptoms, the disease can stunt growth, delay puberty, and weaken bones. Crohn's disease symptoms may sometimes prevent a child from participating in enjoyable activities. The emotional and psychological issues of living with a chronic disease can be especially difficult for young people.
 
About SGX203
 
SGX203 contains BDP, a highly potent, topically active corticosteroid that has a local effect on inflamed tissue. BDP has been marketed in the US and worldwide since the early 1970s as the active pharmaceutical ingredient in inhalation products for the treatment of patients with allergic rhinitis and asthma. SGX203 is a two tablet delivery system of BDP specifically designed for oral use that allows for administration of immediate and delayed release BDP throughout the small bowel and the colon. The FDA has previously awarded SGX203 Orphan Drug designation for the treatment of pediatric Crohn's disease as well as Fast Track designation.
 
About Soligenix, Inc.

Soligenix is a clinical stage biopharmaceutical company developing products to treat serious gastrointestinal diseases where there remains an unmet medical need, as well as developing several biodefense vaccines and therapeutics. Soligenix is developing proprietary formulations of oral BDP (beclomethasone 17,21-dipropionate) for the prevention/treatment of gastrointestinal disorders characterized by severe inflammation, including pediatric Crohn's disease (SGX203), acute radiation enteritis (SGX201) and chronic Graft-versus-Host disease (orBec®), as well as developing its novel innate defense regulator (IDR) technology for the treatment of oral Mucositis (SGX942).    
 
Through its BioDefense Division, Soligenix is developing countermeasures pursuant to the Biomedical Advanced Research and Development Authority (BARDA) Strategic Plan of 2011-2016 for inclusion in the US government's Strategic National Stockpile. Soligenix's lead biodefense products in development are a recombinant subunit vaccine called RiVax™, which is designed to protect against the lethal effects of exposure to ricin toxin and VeloThrax™, a vaccine against anthrax exposure. RiVax™ has been shown to be well tolerated and immunogenic in two Phase 1 clinical trials in healthy volunteers. Both RiVax™ and VeloThrax™ are currently the subject of a $9.4 million National Institute of Allergy and Infectious Diseases (NIAID) grant supporting development of Soligenix's new vaccine heat stabilization technology known as ThermoVax™. Soligenix is also developing OrbeShield™ for the treatment of gastrointestinal acute radiation syndrome (GI ARS) under a $600,000 NIAID Small Business Innovation Research (SBIR) grant. OrbeShield™ has previously demonstrated statistically significant preclinical survival results in two separate canine GI ARS studies funded by the NIH. Recently, Soligenix announced a worldwide exclusive collaboration with Intrexon Corporation that will focus on the joint development of a treatment for Melioidosis, a high priority biothreat and an area of unmet medical need.

For further information regarding Soligenix, Inc., please visit the Company's website at www.soligenix.com.
 

Posted: June 2013

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