DOR BioPharma Receives SPA Clearance From the FDA to Begin Confirmatory Phase 3 Clinical Trial of orBec(R) in GI GVHD
Monday January 5, 7:00 am ET
EWING, NJ--(MARKET WIRE)--Jan 5, 2009 -- DOR BioPharma, Inc. (DOR or the Company) (OTC BB:DORB.OB - News) announced today that it has reached agreement with the US Food and Drug Administration (FDA) on the design of a confirmatory, pivotal Phase 3 clinical trial evaluating its lead product orBec® for the treatment of acute gastrointestinal Graft-versus-Host Disease (GI GVHD). The agreement was made under the FDA's Special Protocol Assessment (SPA) procedure.
An agreement via the SPA procedure is an agreement with the FDA that a Phase 3 clinical trial's design (e.g., endpoints, sample size, control group and statistical analyses) is acceptable to support a regulatory submission seeking new drug approval. After the study begins, the FDA can only change a SPA for very limited reasons.
Based on data from the prior Phase 3 study of orBec®, the upcoming confirmatory Phase 3 protocol will be a highly powered, double-blind, randomized, placebo-controlled, multi-center trial and will seek to enroll an estimated 166 patients. The primary endpoint is the treatment failure rate at Study Day 80. This endpoint was successfully measured as a secondary endpoint (p-value = 0.005) in the previous Phase 3 study as a key measure of durability following a 50-day course of treatment with orBec® (i.e., 30 days following cessation of treatment).
"We are very pleased to gain SPA agreement with the FDA on our confirmatory, pivotal Phase 3 study," stated Christopher J. Schaber, PhD, President and Chief Executive Officer of DOR. "The depth and strength of our available Phase 3 data have allowed us to design and power this pivotal trial that we believe maximizes orBec®'s chances for success. With our primary endpoint of the 'treatment failure rate at Study Day 80,' we expect to replicate statistical significance in this clinically meaningful endpoint with orBec®. We expect to initiate this trial in the first half of 2009."
Dr. Schaber continued, "With the regulatory clarity received from FDA, we are now confident that we have a more clearly defined development path that has the potential to lead to regulatory approval of orBec®. We are excited to move forward with this trial in an effort to address the significant unmet medical need of GI GVHD."
About orBec®
Two prior randomized, double-blind, placebo-controlled Phase 2 and 3 clinical trials support orBec's® ability to provide clinically meaningful outcomes when compared with the current standard of care, including a lowered exposure to systemic corticosteroids following allogeneic transplantation. Currently, there are no approved products to treat GI GVHD. The first trial was a 60-patient Phase 2 single-center clinical trial conducted at the Fred Hutchinson Cancer Research Center. The second trial was a 129-patient pivotal Phase 3 multi-center clinical trial of orBec® conducted at 16 leading bone marrow/stem cell transplantation centers in the US and France. Although orBec® did not achieve statistical significance in the primary endpoint of its pivotal trial, namely median time-to-treatment failure through Day 50 (p-value 0.1177), orBec® did achieve statistical significance in other key secondary endpoints such as the proportion of patients free of GVHD at Day 50 (p-value 0.05) and Day 80 (p-value 0.005) and the median time to treatment failure through Day 80 (p-value 0.0226), as well as a 66% reduction in mortality among patients randomized to orBec® at 200 days post-transplant with only 5 patient (8%) deaths in the orBec® group compared to 16 patient (24%) deaths in the placebo group (p-value 0.0139). At one year post randomization in the pivotal Phase 3 trial, 18 patients (29%) in the orBec® group and 28 patients (42%) in the placebo group died within one year of randomization (46% reduction in mortality, hazard ratio 0.54, 95% CI: 0.30, 0.99, p=0.04, stratified log-rank test).
In the Phase 2 study, the primary endpoint was the clinically relevant determination of whether GI GVHD patients at Day 30 (the end of treatment) had a durable GVHD treatment response as measured by whether or not they were able to consume at least 70% of their estimated caloric requirement. The GVHD treatment response at Day 30 was 22 of 31 (71%) vs. 12 of 29 (41%) in the orBec® and placebo groups, respectively (p-value 0.02). Additionally, the GVHD treatment response at Day 40 (10 days post cessation of therapy) was 16 of 31 (52%) vs. 5 of 29 (17%) in the orBec® and placebo groups, respectively (p-value 0.007).
orBec® represents a first-of-its-kind oral, locally acting therapy tailored to treat the gastrointestinal manifestation of GVHD, the organ system where GVHD is most frequently encountered and highly problematic. orBec® is intended to reduce the need for systemic immunosuppressive drugs to treat GI GVHD. Beclomethasone dipropionate (BDP) is 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 a nasal spray and in a metered-dose inhaler for the treatment of patients with allergic rhinitis and asthma. orBec® is formulated for oral administration as a single product consisting of two tablets; one tablet is intended to release BDP in the proximal portions of the GI tract, and the other tablet is intended to release BDP in the distal portions of the GI tract.
In addition to issued patents and pending worldwide patent applications held by or exclusively licensed to DOR, orBec® also benefits from orphan drug designations in the US and in Europe for the treatment of GI GVHD, which provide for seven and 10 years of post-approval market exclusivity, respectively.
About GI GVHD
GI GVHD is a debilitating and painful disease and constitutes an unmet medical need. It is a common disorder among immunocompromised cancer patients after receiving hematopoietic cell transplantation. Unlike organ transplants where the patient's body may reject the organ, in GVHD it is the donor cells that begin to attack the patient's (host's) body -- most frequently the gastrointestinal tract, liver and skin. Patients with mild-to-moderate GI GVHD typically develop symptoms of anorexia, nausea, vomiting and diarrhea. If left untreated, GI GVHD can progress to ulcerations in the lining of the GI tract, and in its most severe form, can be fatal. |
