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|Protalix Announces New Clinical Data on Taliglucerase Alfa to be Presented at the WORLD Lysosomal Disease Network Symposium|
Patients treated with taliglucerase alfa in the extension trial continued to demonstrate a statistically significant reduction in mean spleen volume after 24 months, compared with baseline, in both treatment groups. Both dosage groups demonstrated statistically significant mean reductions in spleen volume; reductions of 54.0% (p<0.0001) in the 60 U/kg group and of 41.0% (p<0.0001) in the 30 U/kg group. Statistically significant improvements were also observed in all secondary end points. Both groups demonstrated statistically significant mean reductions in liver volume; reductions of 17.5% (p<0.0003) in the 60 U/kg group and of 20.6% (p<0.0001) in the 30 U/kg group. Patients with Hepatomegaly demonstrated a reduction in liver volume of 25.2% (p<0.0001).
Statistically significant mean increases in hemoglobin concentration were also demonstrated by both groups; mean increases from baseline (from 11.6 g/DL to 13.9 g/DL (p<0.0020)) (25.8%) in the 60 U/kg group and mean increases from baseline (from 12.4 g/DL to 13.6 g/DL (p<0.0314)) (13.2%) in the 30 U/kg group. Anemic patients demonstrated a mean increase from baseline in hemoglobin concentration (from 9.5 g/DL to 12.9 g/DL (p<0.0013)) (40.8%).
The data also demonstrated statistically significant mean increases in platelet count for both groups; increases from 69,043 to 141,071 (p<0.0016) in the 60 U/kg group and from 64,900 to 93,333 (p<0.0105) in the 30 U/kg group.
Last, statistically significant mean reductions in chitotriosidase activity were demonstrated by both groups; a reduction of 76% (p<0.0001)) in the 60 U/kg group and of 61% (p<0.0001) in the 30 U/kg group.
"Pivotal and follow-up clinical studies of taliglucerase alfa to date demonstrate that taliglucerase alfa may be an effective treatment for Gaucher disease," said Dr.
The safety analysis presented for both treatment groups demonstrates that taliglucerase alfa was well tolerated, and no drug related serious adverse events were reported. Two patients who participated in the extension trial developed neutralizing IgG antibodies that were determined to be positive in an in vitro assay, and were determined to be negative in a cell-based assay. In addition, one patient in the 60 U/kg dose group experienced a hypersensitivity reaction during month 10 of treatment. Treatment of this patient has been continued with premedication for an additional 32 months without any treatment related adverse event reported.
The results of the switchover trial demonstrate that over a nine-month treatment period of the study, patients remained stable with regard to the efficacy endpoints--spleen volume, liver volume, platelet count and hemoglobin concentration--after switching to taliglucerase alfa from imiglucerase. The safety analysis presented for the switchover trial demonstrates that taliglucerase alfa was well tolerated, and no drug related serious adverse events were reported. One patient developed neutralizing IgG antibodies that were determined to be positive in an in vitro assay, and were determined to be negative in a cell-based assay. Another patient experienced a hypersensitivity reaction, which was treated in a physician's office and resolved. The patient declined to continue infusions with premedication.
"The current findings are in accord with the interim observations made last year, which revealed maintenance of clinical benefit in patients switched from imiglucerase to taliglucerase across all doses. Additionally, all drug-related adverse effects were mild or moderate and transient in nature," said Dr.
Marketing applications for taliglucerase alfa have been filed in
Protalix is a biopharmaceutical company focused on the development and commercialization of recombinant therapeutic proteins expressed through its proprietary plant cell based expression system, ProCellEx(R). Protalix's unique expression system presents a proprietary method for developing recombinant proteins in a cost-effective, industrial-scale manner in an environment free of mammalian components and viruses. Protalix's lead compound, taliglucerase alfa, an enzyme replacement therapy for the treatment of Gaucher disease, completed phase III development. Protalix's development pipeline also includes the following product candidates: PRX-102, a modified version of the recombinant human alpha-GAL-A protein for the treatment of Fabry disease; PRX-105, a pegylated recombinant human acetylcholinesterase in development for several therapeutic and prophylactic indications, a biodefense program and an organophosphate-based pesticide treatment program; an orally-delivered glucocerebrosidase enzyme that is naturally encased in carrot cells, also for the treatment of Gaucher disease; pr-antiTNF, a similar plant cell version of etanercept (Enbrel(R)) for the treatment of certain immune diseases such as rheumatoid arthritis, juvenile idiopathic arthritis, ankylosing spondylitis, psoriatic arthritis and plaque psoriasis; and others.
Forward Looking Statements
To the extent that statements in this press release are not strictly historical, all such statements are forward-looking, and are made pursuant to the safe-harbor provisions of the Private Securities Litigation Reform Act of 1995. The terms "anticipate," "believe," "estimate," "expect" and "intend" and other words or phrases of similar import are intended to identify forward-looking statements. These forward-looking statements are subject to known and unknown risks and uncertainties that may cause actual future experience and results to differ materially from the statements made. These statements are based on our current beliefs and expectations as to such future outcomes. Drug discovery and development involve a high degree of risk. Factors that might cause material differences include, among others: risks relating to the review process of the
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