CARMIEL, Israel, Feb. 11 /PRNewswire-FirstCall/ -- Protalix BioTherapeutics, Inc. (NYSE-Amex: PLX), announced today that additional data from the Company’s pivotal Phase III clinical trial of taliglucerase alfa in patients with Gaucher disease was presented at the Annual Meeting of the Lysosomal Disease Network: WORLD Symposium 2010 in Miami, Florida, during an oral session titled, “Novel Enzyme Replacement Therapy for Gaucher Disease: Phase III Pivotal Clinical Trial with Plant Cell Expressed Recombinant Glucocerebrosidase (prGCD) - taliglucerase alfa.” The oral presentation was made by Hanna Rosenbaum M.D., Director of Hematology Day Care Unit, RAMBAM Medical Center, Haifa, Israel, and study investigator.
The pivotal Phase III clinical trial was a multi-center, world-wide, randomized, double-blind, parallel group, dose-ranging study to assess the safety and efficacy of taliglucerase alfa in 31 treatment-naive patients suffering from Gaucher disease. In the trial, patients were selected randomly for one of two dosing arms (60 U/kg or 30 U/kg) and received intravenous infusions of taliglucerase alfa once every two weeks for a nine month period. The primary endpoint of the study was a 20% mean reduction from baseline in spleen volume after nine months, as measured by MRI. Major secondary endpoints were an increase in hemoglobin, decrease in liver volume and increase in platelet count. The trial enrolled patients at 11 centers throughout Europe, Israel, North America, South America and South Africa.
Statistically significant improvements were also observed for the secondary endpoints after nine months when compared to baseline for the 60 U/kg dose. Patients demonstrated a mean increase in hemoglobin of 2.2 g/dL or 22.2% (p<0.0001), a mean decrease in liver volume of 11.1% (p<0.0001) and a mean elevation in platelet count of 41,494 ml or 72.1% (p=0.0031). For patients in the 30 U/kg dose, statistically significant improvements after nine months compared with baselines were observed for hemoglobin level (increased 1.6 g/dL or 14.8%; p=0.0010) and liver size (decreased 10.48%; p=0.0041); a nominal elevation in platelet count was also seen (11,427 ml or 13.7%; p=0.0460).
The safety analysis for both treatment groups showed that taliglucerase alfa was well tolerated and no serious or severe adverse events were reported. Two patients in the trial developed antibodies to taliglucerase alfa and no patients developed neutralizing antibodies. In addition, two patients experienced hypersensitivity reactions to taliglucerase alfa. No anti-taliglucerase antibodies were detected in these patients and both reactions were treated in the physicians’ clinic and reversed.
“The Phase III results reported today not only support the use of taliglucerase alfa for the treatment of Gaucher disease, but also support the Company’s plant cell based platform technology,” said Dr. David Aviezer, President and CEO of Protalix. “Patients who successfully completed this pivotal study have continued to receive taliglucerase alfa as part of our ongoing extension trial, some for over two and a half years.”
About Gaucher disease
Gaucher disease, an inherited condition, is the most prevalent lysosomal storage disorder, with an incidence of about one in 20,000 live births. People with Gaucher disease do not have enough of an enzyme, beta-glucosidase (glucocerebrosidase) that breaks down a certain type of fat molecule. As a result, lipid engorged cells (called Gaucher cells) amass in different parts of the body, primarily the spleen, liver and bone marrow. Accumulation of Gaucher cells may cause spleen and liver enlargement, anemia, excessive bleeding and bruising, bone disease and a number of other signs and symptoms.
Protalix BioTherapeutics, Inc.
