Protein Polymer's Partner, Femcare Ltd., Receives Approval to Begin Human Clinical Trials of Incontinence Product

    SAN DIEGO, May 1 -- Protein Polymer Technologies, Inc. (OTC Bulletin Board: PPTI) today announced that its partner, Femcare, Ltd., had received approval to initiate human clinical trials in the United Kingdom of PPTI's urethral bulking agent for the treatment of female stress urinary incontinence. The trials are projected to begin at U.K. clinical sites within a few weeks.
    Based on an agreement executed last year, Femcare will conduct clinical studies and commercialize the incontinence product in Europe and Australia. Femcare recently received the approval of the U.K.'s Medical Device Authority to begin human clinical testing. Femcare subsequently expects to gain a CE mark for the product before the end of 2001, and projects limited commercialization will begin in Europe by the 3rd quarter of 2002.
    PPTI's incontinence product -- a formulation containing one of its patented silk-elastin polymers -- is designed for use as an injectable urethral bulking agent (UBA). By injecting the product into the tissues surrounding the sphincter at the base of the bladder, the lumen of the urethra is narrowed to prevent the leakage of urine. Unlike other UBA products, PPTI's product does not lose bulk immediately following injection since the material irreversibly transforms from a polymer solution to a firm yet pliable hydrogel. PPTI believes this property will translate into increased efficacy.
    PPTI's UBA product has received an Investigational Device Exemption (IDE) from the FDA and human testing is in progress in the United States. Preclinical animal studies have shown the product to be easy to use, biocompatible, resistant to migration, and more durable than collagen-based products. The product is projected to enter the U.S. market in late 2004.
    In the United States, urinary incontinence (the unintentional loss of urine) is estimated to affect approximately 13 million people, 85% of them women. Although caused by a variety of factors, women are most likely to develop incontinence either during or following pregnancy or childbirth, or after the hormonal changes of menopause, which cause weakened pelvic muscles. Urinary incontinence can lead to lifestyle restrictions, depression, and may also lead to complications such as urinary tract infections and skin rashes. It is estimated that over $3 billion is spent in the U.S. every year on incontinence-related care.

    Protein Polymer Technologies, Inc., is a San Diego-based company focused on developing products to improve medical and surgical outcomes. From its inception in 1988, PPTI has been a pioneer in protein polymer design and synthesis, developing an extensive portfolio of proprietary biomaterials. Protein polymers are synthetic proteins created "from scratch" through chemical DNA (gene) synthesis, and produced in quantity by traditional large-scale fermentation methods. PPTI now holds 20 U.S. patents on the design, composition of matter, and production of protein polymers, with corresponding international applications in major markets. In addition to its urethral bulking agent for the treatment of stress urinary incontinence, targeted products include, a dermal contouring agent for use in cosmetic surgery and dermatology, tissue adhesive and sealants with emphasis on Spinal disc repair, scaffolds for wound healing and tissue engineering, and depots for local drug delivery.

    Femcare, Ltd., St. Peters Street, Nottingham, NG7 3EN, United Kingdom, was founded in 1982. The Filshie Clip for Female Sterilization, Femcare's lead product, is the female sterilization market leader in the Western world. During the past 18 years Femcare has expanded its product line and geographical business base and now markets its products in countries worldwide. In addition to the Filshie Clip, Femcare has developed products for male sterilization and urology. A Urology division has been established to extend the company's success in gynecology to urological applications, in particular female stress urinary incontinence. Based upon PPTI's urethral bulking agent, Femcare will utilize its existing customer base and its extensive distribution network as the basis for introducing the product into Europe and Australia. To visit the Femcare, Ltd. website, Netscape Navigator users click here. Microsoft Internet Explorer users click here.

This press release may contain forward-looking statements that are based on management's expectations. Actual results could differ materially from those expressed here; further, the Company is not obligated to comment specifically on those differences. Risks associated with the Company's activities include raising adequate capital to continue operations, scientific and product development uncertainties, competitive products and approaches, continuing collaborative partnership interest and funding, regulatory testing and approvals, and manufacturing scale-up. The reader is encouraged to refer to the Company's Annual Report Form 10-KSB, and recent filings with the Securities and Exchange Commission, copies of which are available from the Company, to further ascertain the risks associated with the above statements.