AST ... Ability to enroll patients with second most common cervical spinal cord injury broadens eligible population for SCiStar study and future trials FREMONT, Calif., July 10, 2017 /PRNewswire/ -- Asterias Biotherapeutics, Inc. (NYSE MKT: AST), a biotechnology company pioneering the field of regenerative medicine, today announced that the U.S. Food and Drug Administration (FDA) has accepted the company's amendment to the clinical research protocol for its ongoing AST-OPC1 SCiStar Phase 1/2a clinical trial in motor complete cervical spinal cord injury (SCI). The amendment expands the eligibility criteria to include patients with a C-4 spinal cord injury and extends the dosing window from 14 to 30 days to 21 to 42 days post-injury.
"The FDA's decision to allow Asterias to enroll qualified patients with C-4 level injuries is the result of the data supporting the safety of both AST-OPC1 and the procedure to inject the cells, and means that the second most common cervical spinal cord injury population can now be eligible to receive AST-OPC1," said Dr. Edward Wirth, Chief Medical Officer of Asterias. "The overall changes to the study protocol will enhance our ability to enroll qualified patient candidates for our current SCiStar study and we also expect the changes to help enrollment rates in a future, larger clinical study."
The protocol amendment will expand patient eligibility and enable study investigators to administer AST-OPC1 to patients with injuries at one vertebral level higher than the trial's previous C-5 limitation, to the fourth cervical vertebra down, known as C-4, near the middle of the neck. A C-4 cervical level injury, the second most common level of SCI in the SCiStar study's targeted patient population, generally means that the injured person is paralyzed from the neck down and requires round-the-clock care. The lifetime direct costs of care for a patient suffering a high cervical spinal cord injury, such as a C-4 spinal cord injury, can approach $5 million. As suggested by existing research, if these patients can show two motor levels of improvement on at least one side they may regain the ability to perform daily activities such as feeding, dressing and bathing, which increases their quality of life and independence and significantly reduces the overall level of required daily assistance and associated healthcare costs for these patients.
In addition, the amendment to inclusion parameters will also expand the dosing window to 21 to 42 days after a patient's spinal cord injury occurs, providing study investigators more time to screen patients to determine if they are eligible to participate in the SCiStar study. The expansion of the dosing window is supported by recent preclinical research that indicated AST-OPC1 cells can durably engraft at a patient's injury site when administered up to two months after the date of injury.
About the SCiStar Trial The SCiStar trial is an open-label, single-arm trial testing three sequential escalating doses of AST-OPC1 administered at up to 20 million AST-OPC1 cells in as many as 35 patients with subacute, C-4 to C-7, motor complete (AIS-A or AIS-B) cervical SCI. These individuals have essentially lost all movement below their injury site and experience severe paralysis of the upper and lower limbs. AIS-A patients have lost all motor and sensory function below their injury site, while AIS-B patients have lost all motor function but may have retained some minimal sensory function below their injury site. AST-OPC1 is being administered 21 to 42 days post-injury. Patients will be followed by neurological exams and imaging procedures to assess the safety and activity of the product. The study is being conducted at six centers in the U.S. and the company plans to increase this to up to 12 sites to accommodate the expanded patient enrollment.
Clinical sites involved in the study include the Medical College of Wisconsin in Milwaukee, Shepherd Medical Center in Atlanta, University of Southern California (USC) jointly with Rancho Los Amigos National Rehabilitation Center in Los Angeles, Indiana University, Rush University Medical Center in Chicago and Santa Clara Valley Medical Center in San Jose jointly with Stanford University. Asterias has received a Strategic Partnerships Award grant from the California Institute for Regenerative Medicine, which provides $14.3 million of non-dilutive funding for the Phase 1/2a clinical trial and other product development activities for AST-OPC1. Additional information on the Phase 1/2a trial, including trial sites, can be found at www.clinicaltrials.gov, using Identifier NCT02302157, and at the SCiStar Study Website (www.SCiStar-study.com).
About AST-OPC1 AST-OPC1, an oligodendrocyte progenitor population derived from human embryonic stem cells originally isolated in 1998, has been shown in animals and in vitro to have three potentially reparative functions that address the complex pathologies observed at the injury site of a spinal cord injury. These activities of AST-OPC1 include production of neurotrophic factors, stimulation of vascularization, and induction of remyelination of denuded axons, all of which are critical for survival, regrowth and conduction of nerve impulses through axons at the injury site. In preclinical animal testing, AST-OPC1 administration led to remyelination of axons, improved hindlimb and forelimb locomotor function, dramatic reductions in injury-related cavitation and significant preservation of myelinated axons traversing the injury site. In a previous Phase 1 clinical trial, five patients with neurologically complete, thoracic spinal cord injury were administered two million AST-OPC1 cells at the spinal cord injury site 7-14 days post-injury. Based on the results of this study, Asterias received clearance from FDA to progress testing of AST-OPC1 to patients with cervical spine injuries in the current SCiStar study, which represents the first targeted population for registration trials. Asterias has completed enrollment in the first two cohorts of this study. Results to date have continued to support the safety of AST-OPC1, with no serious adverse events related to AST-OPC1 or its administration. Additionally, Asterias has recently reported results suggesting reduced cavitation and improved motor function in patients administered AST-OPC1 in the SCiStar trial. |
