Protherics submits DigiFab(TM) New Drug Submission in Canada

Announces that it has submitted a New Drug Submission to the Health Products and Food Branch of Health Canada for DigiFabTM.

LONDON, UK and BRENTWOOD, TN, US | Jan 08, 2007 | Protherics PLC (“Protherics” or the “Company”), the international biopharmaceutical company focused on critical care and cancer, today announces that it has submitted a New Drug Submission to the Health Products and Food Branch of Health Canada for DigiFabTM. DigiFabTM is the leading digoxin antidote in the US where it is approved for the treatment of life-threatening or potentially life-threatening digoxin toxicity or overdose.
DigiFabTM is an ovine derived antibody fragment (Fab) preparation for the treatment of digoxin intoxication, which can produce severe effects on the heart and central nervous system, sometimes leading to death. Protherics is seeking to expand DigiFab™ into markets outside of the US, including Canada and Europe.

Subject to regulatory review, Protherics expects to receive marketing approval in the UK in the first half of 2007, in other European countries in the following six to twelve months and in Canada in 2008. In addition, Protherics recently announced an agreement with Roche to replace its digoxin antidote, Digitalis-Antidot®, with DigiFab™ to facilitate its withdrawal from the market. Protherics estimates that the market opportunity for digoxin antidotes outside of the US is approximately $5 to $10 million per annum.

Andrew Heath, Chief Executive of Protherics said:
“DigiFab is now the established market leader in the digoxin antidote market, worth an estimated $30 million per annum, and we are consolidating this position by making our product more widely available outside of the US. It is important to maximise our revenue generating opportunities from our niche marketed products, in parallel with delivering value from our recently expanded development pipeline.”

Notes for Editors:
About DigiFabTM
DigiFabTM contains purified ovine polyclonal antibody fragments and each vial of DigiFabTM, which contains 40 mg of digoxin immune Fab, will bind approximately 0.5 mg digoxin.

DigiFabTM is indicated in the US for the treatment of patients with life-threatening or potentially life-threatening digoxin toxicity or overdose. Clinical conditions requiring administration of DigiFabTM include known suicidal or accidental consumption of fatal doses of digoxin, chronic overdoses or any ingestion leading to life-threatening manifestations of toxicity, such as ventricular arrhythmia.

In clinical studies, DigiFabTM reduced digoxin in the blood to undetectable levels in all subjects and digoxin toxicity was resolved in 14 out of 15 (93%) patients 20 hours after receiving DigiFabTM.

Adverse reactions that could occur with the use of DigiFabTM include exacerbation of low cardiac output states and congestive heart failure due to the withdrawal of the inotropic effect of digitalis, hypokalemia due to reactivation of the sodium-potassium ATPase, rapid ventricular response in patients with atrial fibrillation due to withdrawal of the effects of digitalis on the atrioventricular node and rare allergic reactions.

About Protherics
Protherics (LSE: PTI, NASDAQ: PTIL) is an integrated biopharmaceutical company focused on the development, manufacture and marketing of specialist products for critical care and oncology.

Protherics’ strategy is to use the revenues generated from its marketed products to help fund the advancement of its development pipeline. With a proven track record, Protherics’ goal is to develop and attract additional critical care and cancer products for its sales and marketing teams to distribute in the US and Europe.

The majority of the Company’s sales revenues (£17.7m in the year ended 31 March 2006) are derived from two critical care products, CroFab™ (pit viper antivenom) and DigiFab™ (digoxin antidote) which were developed by Protherics and are sold, in the US, through Fougera Inc, a division of Altana AG.

Protherics potentially has two blockbuster opportunities in its critical care franchise. CytoFab™ is being developed by AstraZeneca for the treatment of severe sepsis, and is expected to start an additional phase 2 study in 2007. In addition the Company has in-licensed the intellectual property from Glenveigh (a small private US based company) relating to the use of anti-digoxin polyclonal antibody fragments such as DigiFab™ and GSK’s Digibind® in the treatment of pre-eclampsia and eclampsia.


Glenveigh is currently undertaking a phase 2b study with Digibind® which Protherics expects to report in 2007.

Following the recent acquisition of MacroMed, a US based drug development and manufacturing company, Protherics has four cancer products in development, including Voraxaze™. Voraxaze™ is expected to be approved, subject to regulatory reviews, in the EU in H1 2007 and in the US from H2 2008, as an intervention when methotrexate blood levels remain dangerously elevated following high dose therapy for the treatment of cancer. Protherics is planning to build its own sales force to undertake the sales and marketing of Voraxaze™. In addition, the Company is developing its Angiotensin Therapeutic Vaccine for the treatment of hypertension.

With headquarters in London, the Company has about 260 employees across its operations in the UK, US and Australia.
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This document contains forward-looking statements that involve risks and uncertainties, including with respect to Protherics’ product pipeline and anticipated development and clinical trials for product candidates. Although we believe that the expectations reflected in such forward-looking statements are reasonable at this time, we can give no assurance that such expectations will prove to be correct. Given these uncertainties, readers are cautioned not to place undue reliance on such forward-looking statements. Actual results could differ materially from those anticipated in these forward-looking statements due to many important factors, including the factors discussed in Protherics’ Annual Report on Form 20-F and other reports filed from time to time with the U.S. Securities and Exchange Commission. We do not undertake to update any oral or written forward-looking statements that may be made by or on behalf of Protherics.

SOURCE: Protherics PLC

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