All amounts are in U.S. dollars QUEBEC CITY, Aug. 14 /PRNewswire-FirstCall/ AEterna Zentaris Inc. (TSX: AEZ; NASDAQ: AEZS), a global biopharmaceutical company focused on endocrine therapy and oncology, today reported financial and operating results for the second quarter ended June 30, 2007. "I am pleased with our progress during the second quarter. Most importantly, we commenced patient dosing for the first trial of the Phase 3 program for cetrorelix in BPH. With recruitment underway, our other clinical programs progressing very well and the addition of key executives to our team, we are able to focus on a rigorous strategic review of our product portfolio and business opportunities, and I am confident we will have a coherent plan, optimized for success to communicate to you in September," said David J. Mazzo, Ph.D., AEterna Zentaris' President and Chief Executive Officer. KEY DEVELOPMENTS FOR THE SECOND QUARTER ENDED JUNE 30, 2007 CORPORATE: - The Company bolstered its executive management team with the appointments of Ellen McDonald, MBA, Senior Vice President, Business Operations and Chief Business Officer, as well as Nicholas J. Pelliccione, Ph.D., Senior Vice President, Regulatory Affairs and Quality Assurance. ADVANCING THE PIPELINE: Cetrorelix - Patient dosing commenced with cetrorelix, the Company's lead luteinizing hormone-releasing hormone (LHRH) antagonist compound, in the first study of its extensive Phase 3 program in benign prostatic hyperplasia (BPH). - AEterna Zentaris regained exclusive worldwide (ex-Japan) rights for cetrorelix from Solvay Pharmaceuticals (Euronext: SOLB) in all indications, including endometriosis, without any financial compensation payable to Solvay. Ozarelix - Positive, detailed Phase 2 BPH results for ozarelix, a fourth- generation LHRH/GnRH antagonist, were presented at the American Urological Association (AUA) Annual Meeting. - Enrollment was completed for the Phase 2b trial in BPH being conducted in the U.S. and Canada by Spectrum Pharmaceuticals (NASDAQ:SPPI). Perifosine - Positive Phase 1 and Phase 2 results for perifosine, an oral anti- cancer signal transduction inhibitor compound for the treatment of patients with advanced sarcoma were presented at the American Society of Clinical Oncology's (ASCO) Annual Meeting. AEZS-108 - Positive, detailed Phase 1 results for AEZS-108, a targeted cytotoxic LHRH analog, were reported in female patients with cancers expressing LHRH receptors at the ASCO Annual Meeting. RESULTS FOR THE SECOND QUARTER ENDED JUNE 30, 2007 Consolidated cash and short-term investments were $51.5 million as of June 30, 2007 compared to $61 million as of December 31, 2006. Consolidated revenues for the second quarter ended June 30, 2007 were $12.2 million, an increase of 29.8% compared to revenues of $9.4 million for the same period in 2006. The increase in consolidated revenues is mainly attributed to increased sales of both Cetrotide(R) and Impavido(R). Consolidated R&D costs, net of tax credits and grants (R&D), were $8 million for the quarter ended June 30, 2007 compared to $7.3 million for the same period in 2006. The increase in R&D expense was related to the additional expenses incurred with respect to the Phase 3 program with cetrorelix in BPH, as well as further advancement of targeted, earlier clinical-stage development programs. Consolidated selling, general and administrative (SG&A) expenses were $4.7 million for the quarter ended June 30, 2007 compared to $4.5 million for the same period in 2006. Consolidated loss from operations decreased to $5.1 million for the quarter ended June 30, 2007 compared to $5.5 million for the same period in 2006. The decrease in loss from operations is attributable to increased sales of Cetrotide(R) and Impavido(R) partly offset by additional expenses in R&D. Net loss from continuing operations for the quarter ended June 30, 2007 was $4.8 million compared to $4.4 million for the same period in 2006. This increase is attributable to a combination of higher R&D expenses and to the foreign exchange loss recorded during the quarter ended June 30, 2007, partly offset by increased revenues. Net earnings from discontinued operations for the second quarter ended June 30, 2006 were nearly $2.9 million and were completely attributable to the Company's former subsidiary Atrium Innovations which operations were excluded from consolidation effective on October 18, 2006. Consolidated net loss for the quarter ended June 30, 2007 was $4.8 million or $0.09 per basic and diluted share, compared to $1.6 million or $0.03 per basic and diluted share for the same period in 2006. The net loss increase for the quarter is attributable to the completion of the distribution of AEterna Zentaris remaining interest in Atrium to the Company's shareholders on January 2, 2007. CONFERENCE CALL Management will be hosting a conference call for the investment community beginning at 10:30 a.m. Eastern Time today, Tuesday, August 14, to discuss results for the quarter ended June 30, 2007. To participate in the live conference call by telephone, please dial 416-644-3420, 514-807-8791 or 800-731-5774. Individuals interested in listening to the conference call on the Internet may do so by visiting http://www.aeternazentaris.com/. A replay will be available on the Company's Web site for 30 days. About AEterna Zentaris Inc. AEterna Zentaris Inc. is global biopharmaceutical company focused on endocrine therapy and oncology with proven expertise in drug discovery, development and commercialization. News releases and additional information are available at http://www.aeternazentaris.com/. Forward-Looking Statements This press release contains forward-looking statements made pursuant to the safe harbor provisions of the U.S. Securities Litigation Reform Act of 1995. Forward-looking statements involve known and unknown risks and uncertainties, which could cause the Company's actual results to differ materially from those in the forward-looking statements. Such risks and uncertainties include, among others, the availability of funds and resources to pursue R&D projects, the successful and timely completion of clinical studies, the ability of the Company to take advantage of business opportunities in the pharmaceutical industry, uncertainties related to the regulatory process and general changes in economic conditions. Investors should consult the Company's quarterly and annual filings with the Canadian and U.S. securities commissions for additional information on risks and uncertainties relating to the forward-looking statements. Investors are cautioned not to rely on these forward-looking statements. The Company does not undertake to update these forward-looking statements. Attachment: Financial summary (In thousands of US dollars, except share and per share data) Three months ended Six months ended CONSOLIDATED RESULTS June 30, June 30, Unaudited 2007 2006 2007 2006 ------------------------------------------------------------------------- ------------------------------------------------------------------------- $ $ $ $ Revenues Sales and royalties 8,376 5,227 16,414 11,803 License fees 3,852 4,156 5,764 6,328 ------------------------------------------------------------------------- 12,228 9,383 22,178 18,131 ------------------------------------------------------------------------- Operating expenses Cost of sales 3,196 1,404 6,659 4,046 R&D costs, net of tax credits and grants 8,015 7,262 16,199 14,066 Selling, general and administrative 4,672 4,515 9,768 8,360 Depreciation and amortization 1,491 1,653 2,955 3,216 ------------------------------------------------------------------------- 17,374 14,834 35,581 29,688 ------------------------------------------------------------------------- Loss from operations (5,146) (5,451) (13,403) (11,557) Interest income 305 282 878 510 Interest expense (53) (19) (54) (1,262) Foreign exchange loss (693) (126) (653) (85) ------------------------------------------------------------------------- Loss before income taxes (5,587) (5,314) (13,232) (12,394) Income tax recovery 741 884 3,276 2,063 ------------------------------------------------------------------------- Net loss from continuing operations (4,846) (4,430) (9,956) (10,331) Net earnings from discontinued operations - 2,868 - 6,189 ------------------------------------------------------------------------- Net loss for the period (4,846) (1,562) (9,956) (4,142) ------------------------------------------------------------------------- ------------------------------------------------------------------------- Net loss per share from continuing operations Basic and diluted (0.09) (0.08) (0.19) (0.20) ------------------------------------------------------------------------- ------------------------------------------------------------------------- Net loss per share Basic and diluted (0.09) (0.03) (0.19) (0.08) ------------------------------------------------------------------------- ------------------------------------------------------------------------- Weighted average number of shares Basic and diluted 53,179,470 52,682,969 53,179,470 52,098,582 Issued and outstanding shares 53,179,470 53,160,970 (In thousands of US dollars) CONSOLIDATED BALANCE SHEETS June 30, December 31, Unaudited 2007 2006 ------------------------------------------------------------------------- ------------------------------------------------------------------------- $ $ Cash and short-term investments 51,500 61,019 Other current assets 20,186 40,704 ---------------------------- 71,686 101,723 Long-term assets 63,809 121,768 ---------------------------- Total assets 135,495 223,491 ---------------------------- ---------------------------- Current liabilities 17,642 16,310 Deferred revenues 4,781 8,468 Long-term debt - 704 Other long-term liabilities 10,608 19,130 ---------------------------- 33,031 44,612 Shareholders' equity 102,464 178,879 ---------------------------- Total liabilities and shareholders' equity 135,495 223,491 ---------------------------- ---------------------------- DATASOURCE: AETERNA ZENTARIS INC. CONTACT: Jenene Thomas, Senior Director, Investor Relations & Corporate Communications, (908) 938-1475, ; Paul Burroughs, Media Relations, (418) 652-8525 ext. 406,

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