Prepared and Filed by St Ives Burrups

Filed Pursuant to Rule 425
Under the Securities Act of 1933
And Deemed Filed Pursuant to Rule 14a-12
Under the Securities Exchange Act of 1934

Filed by Enzon Pharmaceuticals, Inc.
Subject Company: Enzon Pharmaceuticals, Inc.
NPS Pharmaceuticals, Inc.
Commission File No. 000-12957

The following materials were distributed by Enzon Pharmaceuticals, Inc. (“Enzon”) and NPS Pharmaceuticals, Inc. (“NPS”) to attendees of the Sun Trust Robinson Humphrey 32nd Annual Institutional Investor Conference held on April 8, 2003, in Atlanta, Georgia to discuss the proposed business combination between Enzon and NPS.

SCIENCE, PIPELINE, PRODUCTS: Creating a Biotechnology Leader
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Safe Harbor

Cautionary Statement For The Purpose Of The “Safe Harbor”
Provisions Of The Private Securities Litigation Reform Act Of 1995

           This presentation contains forward-looking statements within the meaning of the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995. These statements are based on management’s current expectations and beliefs and are subject to a number of factors and uncertainties that could cause actual results to differ materially from those described in the forward-looking statements. The forward-looking statements contained in this presentation include statements about future financial and operating results and the proposed NPS/Enzon merger. These statements are not guarantees of future performance, involve certain risks, uncertainties and assumptions that are difficult to predict, and are based upon assumptions as to future events that may not prove accurate. Therefore, actual outcomes and results may differ materially from what is expressed herein. For example, if either of the companies do not receive required stockholder or governmental approvals or fail to satisfy other conditions to closing, the transaction will not be consummated. In any forward-looking statement in which NPS or Enzon expresses an expectation or belief as to future results, such expectation or belief is expressed in good faith and believed to have a reasonable basis, but there can be no assurance that the statement or expectation or belief will result or be achieved or accomplished. The following factors, among others, could cause actual results to differ materially from those described in the forward-looking statements: the risk that the NPS and Enzon businesses will not be integrated successfully; costs related to the proposed merger, failure of the NPS or Enzon stockholders to approve the proposed merger; and other economic, business, competitive and/or regulatory factors affecting NPS’ and Enzon’s businesses generally as set forth in NPS’s and Enzon’s filings with the SEC, including their Annual Reports on Form 10-K for their respective most recent fiscal years, especially in the Management’s Discussion and Analysis section, their most recent Quarterly Reports on Form 10-Q and their Current Reports on Form 8-K. NPS and Enzon are under no obligation to (and expressly disclaim any such obligation to) update or alter their forward-looking statements whether as a result of new information, future events or otherwise.

 
     
     
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Safe Harbor continued

Additional Information And Where To Find It

          In connection with the proposed NPS-Enzon merger, NPS, Enzon and Momentum Merger Corporation have caused to be filed a joint proxy statement/prospectus with the SEC in connection with the transaction described herein. INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE JOINT PROXY STATEMENT/PROSPECTUS BECAUSE IT CONTAINS IMPORTANT INFORMATION ABOUT THE TRANSACTION DESCRIBED HEREIN. Investors and security holders may obtain a free copy of the joint proxy statement/prospectus and other documents filed by NPS and Enzon with the SEC at the SEC’s web site at http://www.sec.gov or by contacting NPS at 801-583-4939 and through NPS’ website at http://www.npsp.com, or by contacting Enzon at 908-541-8678 and through Enzon’s website at http://www.enzon.com.

NPS and its directors and executive officers may be deemed to be participants in the solicitation of proxies from the stockholders of NPS and Enzon in connection with the transaction described herein. Information regarding the special interests of these directors and executive officers in the transaction described is included in the joint proxy statement/prospectus described above. Additional information regarding these directors and executive officers is also included in NPS’ 2002 Annual Report on Form 10-K, which was filed with the SEC on March 21, 2003. This document is available free of charge at the SEC’s web site at http://www.sec.gov or by contacting NPS at 801-583-4939 and through NPS’ website at http://www.npsp.com.

Enzon and its directors and executive officers also may be deemed to be participants in the solicitation of proxies from the stockholders of Enzon and NPS in connection with the transaction described herein. Information regarding the special interests of these directors and executive officers in the transaction described herein is included in the joint proxy statement/prospectus described above. Additional information regarding these directors and executive officers is also included in Enzon’s proxy statement for its 2002 Annual Meeting of Stockholders, which was filed with the SEC on or about October 28, 2002. This document is available free of charge at the SEC’s web site at http://www.sec.gov or by contacting Enzon at 908-541-8678 and through Enzon’s website at http://www.enzon.com.

 
     
     
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  Our Mutual Goal  

 

 

 

 
 
  To Build a Sustainable Top-Tier Biotech Based On:  
       
  A deep, diversified and sustainable pipeline  
     
     A clearly defined pathway to profitability  
     
     A fully integrated infrastructure and stable financial position  
     
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A Fully Integrated Biotechnology Leader

 

 
     

 

Platform Technologies

  Preclinical   Phase I   Phase II   Phase III   Commercialization
& Manufacturing
 
                         
                                     
  PEGylation   SCA Projects         Prothecan              
                          PEG-INTRON  
  Single-Chain Antibodies   PEG-Cytoxics   NPS 1776         Cinacalcet   ABELCET  
      Inhaled Leuprolide   NPS 1506   ALX-0600   PREOS   ADAGEN  
              Calcilytics   Cinacalcet         ONCASPAR  
  GPCR's   Glycine
Re-uptake Inhibitors
                DEPOCYT  
        Metabotropic Glutamate Receptors                      
     
      NPS
      ENZON
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Synergies Expand and Accelerate
Value Creation
 
       
       
  Expand pipeline development  
    e.g., CNS product opportunities  
        
     Accelerate program development  
    e.g., ALX-0600 for multiple indications  
       
     Leverage financial strength and commercial capacity  
    e.g., in-license products and technologies, and optimize PREOS partnership  
       
       
     
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The Merger Creates a Top-Tier Biotech
       
  Management with a proven record of building businesses  
       
  Drug discovery and development expertise  
       
  Manufacturing capacity and experience  
       
  Commercial infrastructure  
       
  Strong, dependable revenues  
       
       
       
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Post Merger Strengths
       
  Fully integrated:  
    From drug discovery through manufacturing and commercialization  
       
  Innovative and robust pipeline:  
    ~$150M R&D budget *  
    Phase III: 2 programs  
    Phase II: 3 programs  
    >10 early stage programs  
    Multiple platform technologies  
       
       
       
    *Based upon 2003 pro-forma financials  
       
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Post Merger Metrics
         
  Comparable Company Analysis(a)    
        2003 Est.
Products
     
    Company Market Value Revenue R&D Marketed Phase III      
    Millennium $2,152.2
 $402.5
 $496.5
2 --      
    Celgene $1,942.9  $171.0
 $  89.8
1 1      
    Amylin $1,334.2
 $  49.4
 $111.8
0 1      
    Neurocrine
$1,297.1
 $  92.0
 $110.5
0 1      
    ICOS $1,055.7
 $105.5
 $157.5
1 1      
    Enzon/NPS
  ~$200.0 
>$150.0 
5 2      
    (a) Projected Financial Information as per Wall Street
equity research and calendarized to reflect 12/31 year end
 
     
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  Pipeline, Products
& Technologies
 
     
     
     
     
     
     
     
     
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Product Pipeline & Marketed Products
         
 
Product
Preclinical/
Research
Phase I Phase II Phase III Marketed   Partner
 
  PEG-INTRON
blue arrow extending to Marketed   Schering-Plough
  ABELCET
blue arrow extending to Marketed   Proprietary
  ADAGEN
blue arrow extending to Marketed   Proprietary
  ONCASPAR blue arrow extending to Marketed   Proprietary
  DEPOCYT
blue arrow extending to Marketed   Proprietary
  Cinacalcet HCl
yellow arrow extending to Phase III     Amgen/Kirin
  PREOS
yellow arrow extending to Phase III     Proprietary
  PROTHECAN
blue arrow extending to Phase II     Proprietary
  ALX-0600
yellow arrow extending to Phase II     Proprietary
  Cinacalcet HCl
yellow arrow extending to Phase II     Amgen/Kirin
  NPS 1776
yellow arrow extending to Phase I         Proprietary
  NPS 1506
yellow arrow extending to Phase I         Proprietary
  Calcilytics
yellow arrow extending to Phase I         GSK
  PEG-Cytotoxics
blue arrow extending to Preclinical Research           Proprietary
  Gly-T Inhibitors
yellow arrow extending to Preclinical Research           Janssen
  mGluRs
yellow arrow extending to Preclinical Research           AstraZeneca
  SCA’s
blue arrow extending to Preclinical Research           Micromet
  Inhaled Leuprolide
blue arrow extending to Preclinical Research           Nektar
                 
      blue arrow = Enzon   yellow arrow = NPS    
 
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5 Marketed Products
       
       
  PEG-INTRON ®  
       
  ABELCET ®  
       
  ONCASPAR ®
 
       
  DEPOCYT ®
 
       
  ADAGEN ®
 
       
       
         
         
         
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PEG-INTRON:
A Strong Revenue Base
       
  U.S. Pegylated alpha-interferon scripts increasing  
       
  Roche share of new U.S. scripts holding at approximately 20%  
       
  Japan represents significant upside beginning in 2005  
       
  Solid intellectual property position  
       
  Potential for price increases and expanded indications  
       
       
       
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  2 Phase III Clinical Products  
         
     
         
  PREOS™   Cinacalcet HCl  
         
         
         
         
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  PREOS™
(Intact Human Parathyroid Hormone)
 
           
  Stimulates natural bone growth, with potential for:    
    Stronger, healthier bones    
    A lower risk of fracture    
         
         
         
           
  Recent PaTH data support Phase II results and possible PREOS and bisphosphonate combination    
           
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PREOS
       
  Expect to compete in a large and growing market  
       
  Pivotal Phase III study to be completed in September 2003
 
       
  FDA submission targeted for mid-2004  
       
  Launch anticipated by late 2005  
       
  Combined company more able to aggressively execute development program and negotiate an optimal partnership  
       
       
       
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  Cinacalcet HCl  
           
  Novel treatment for hyperparathyroidism (HPT)    
         
  Market opportunity (U.S.)    
    Primary HPT
500,000 patients
   
    Secondary HPT
280,000 dialysis patients
   
    Secondary HPT
800,000 predialysis patients
   
         
         
           
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Cinacalcet HCl
       
  Amgen’s Phase III program on-going and on-track  
       
  Amgen confirms 2H 03 NDA filing  
       
  First-in-class molecule in growing market  
       
  Potential for significant royalty stream  
       
       
       
       
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  Operational Overview  
     
     
     
     
     
     
     
     
     
     
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Combined Management Team Includes:
 
 
Hunter Jackson, Ph.D. (NPS)
Executive Chairman of the Board
 
Arthur J. Higgins (Enzon)
Chief Executive Officer
 
Ulrich Grau, Ph.D. (Enzon)
Executive Vice President, Research and Development
 
Kenneth J. Zuerblis (Enzon)
Executive Vice President, Finance, Chief Financial Officer & Secretary
 
Thomas B. Marriott, Ph.D. (NPS)
Executive Vice President, Development
 
David L. Clark (NPS)
Executive Vice President, Corporate Communications and Investor Relations
 
 
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Locations
Map showing locations:

Research in Salt Lake City, Utah;
Manufacturing in Indianapolis, IN;
Research in Toronto, Canada;
Manufacturing in Toronto, Canada;
Research in Piscataway, NJ;
Manufacturing in South Plainfield, NJ;
and Headquarters in Bridgewater, NJ
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Selected Pro-Forma Financials
 
 
    Pro-Forma Operating Summary (US$ in millions)    
    Year Ending December 31, 2002 Pro Forma 2002    
 
 
           
  Product Revenues:        
 
Sales
$ 31.5    
 
Royalties
$ 82.6    
    $ 114.1 *  
  *(Current estimated annualized revenues = $200.0)        
           
  Expenses:        
 
SG&A
$ 48.0    
 
R&D
$ 102.0    
           
  Long-Term Convertible Debt $ 400.0    
           
  Ending Cash Balance $ 380.0    
           
           
           
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Expected Milestones and News Flow
           
        arrowhead
  Type
  2003
2004 
       
 
       
  Clinical Data
Phase III Cinacalcet HCl data in secondary HPT
  Regulatory
File Cinacalcet HCI NDA
  Clinical Data
PREOS 2-year rat toxicology study data
  Clinical Data
PREOS TOP Study completed
  Clinical Data
Phase IIa results from PROTHECAN
  Clinical Data
Initiate additional PII/III ALX-0600 (SBS)
  Market Data
HCV maintenance studies
  Regulatory
File PREOS NDA
  Regulatory
Prothecan Phase III program
  Clinical Data
Cinacalcet HCl approval
 
     = NPS    = Enzon  
           
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2007… Where We’re Going
       
  Revenue > $500M  
       
  Strong, balanced clinical pipeline  
       
  R&D budget > $180M  
       
  EBITDA > $100M  
       
  Industry leading growth rate  
       
  Cash > $500M  
       
       
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SCIENCE, PIPELINE, PRODUCTS: Creating a Biotechnology Leader
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