SCICLONE PHARMACEUTICALS INC
S-3, 1999-04-30
PHARMACEUTICAL PREPARATIONS
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<PAGE>   1

     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON APRIL 30, 1999

                                               REGISTRATION NO. 333-____________

================================================================================



                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   ----------

                                    FORM S-3

             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

                                   ----------

                         SCICLONE PHARMACEUTICALS, INC.
             (Exact name of registrant as specified in its charter)

                                   ----------

               CALIFORNIA                                   94-3116852
     (State or other jurisdiction of                       (IRS Employer
     incorporation or organization)                     Identification No.)

                    901 MARINERS ISLAND BOULEVARD, SUITE 205
                           SAN MATEO, CALIFORNIA 94404
                                 (650) 358-3456
       (Address, including zip code, and telephone number, including area
               code, of registrant's principal executive offices)

                                   ----------

                                DONALD R. SELLERS
                      PRESIDENT AND CHIEF EXECUTIVE OFFICER
                         SCICLONE PHARMACEUTICALS, INC.
                    901 MARINERS ISLAND BOULEVARD, SUITE 205
                           SAN MATEO, CALIFORNIA 94404
                                 (650) 358-3456
            (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)

                                   Copies to:
                             J. HOWARD CLOWES, ESQ.
                        Gray Cary Ware & Freidenrich LLP
                         139 Townsend Street, Suite 400
                        San Francisco, California 94107
                                 (415) 836-2500

- --------------------------------------------------------------------------------

        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: From
time to time as described in the Prospectus after the effective date of this
Registration Statement.

        If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box. [ ]

        If any of the securities being registered on this Form are to be offered
on a delayed or continuous basis pursuant to Rule 415 under the Securities Act
of 1933, other than securities offered only in connection with dividend or
interest reinvestment plans, check the following box. [X]

        If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [ ] __________

        If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [ ] __________

        If delivery of the prospectus is expected to be made pursuant to Rule
434, please check the following box. [ ]

                         CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
==========================================================================================================
                                                 PROPOSED MAXIMUM     PROPOSED MAXIMUM
  Title of Each Class of          AMOUNT TO BE    OFFERING PRICE     AGGREGATE OFFERING      AMOUNT OF
Securities to be Registered        REGISTERED        PER SHARE             PRICE          REGISTRATION FEE
- ----------------------------------------------------------------------------------------------------------
<S>                            <C>                   <C>                 <C>                  <C>    
common stock (no par value)    375,000 shares(1)     $ 1.55(2)           $  581,250           $161.59
- ----------------------------------------------------------------------------------------------------------
common stock (no par value)    375,000 shares(3)     $4.125(4)           $1,546,875           $430.03
- ----------------------------------------------------------------------------------------------------------
           total:              750,000 shares                            $2,128,125           $591.62
==========================================================================================================
</TABLE>

(1)  Represents the number of shares of SciClone common stock issued in
     connection with SciClone's acquisition of certain rights related to
     ZADAXIN(R) thymosin alpha 1 in Italy, Spain and Portugal, as described in
     the prospectus.

(2)  Estimated solely for the purpose of computing the registration fee pursuant
     to Rule 457(c) of the Securities Act of 1933, as amended, and based on the
     average of the high and low sales prices of the common stock, as reported
     on the Nasdaq National Market on April 26, 1999.

(3)  Represents the number of shares of common stock issuable upon exercise of a
     warrant issued in connection with SciClone's acquisition of certain rights
     related to ZADAXIN(R) thymosin alpha 1 in Italy, Spain and Portugal, as
     described in the prospectus.

(4)  Estimated solely for the purpose of computing the registration fee pursuant
     to Rule 457(g) of the Securities Act.

<PAGE>   2

THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR DATES
AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL FILE
A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION STATEMENT
SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF THE
SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SUCH SECTION 8(a),
MAY DETERMINE.

================================================================================
<PAGE>   3



               SUBJECT TO COMPLETION, DATED _______________, 1999

                                 750,000 SHARES

                         SCICLONE PHARMACEUTICALS, INC.

                                  COMMON STOCK

        This prospectus relates to the offer and sale of up to 750,000 shares of
our common stock by Solar Developments and Partners, the selling shareholder.
375,000 of the shares have been issued, and 375,000 of the shares are issuable
upon exercise of a warrant. The 375,000 issued shares and the warrant were
issued in connection with our acquisition from Sclavo S.p.A. of rights related
to ZADAXIN(R) thymosin alpha 1 in Italy, Spain and Portugal. Solar Developments
and Partners is a designee of Sclavo. Our agreement with Sclavo is described in
more detail on page 9.

        Our common stock is quoted on The Nasdaq National Market under the
symbol "SCLN." On April 26, 1999, the last sale price of the common stock as
reported on The Nasdaq National Market was $1.53.

        Our principal executive offices are located at 901 Mariners Island
Boulevard, Suite 205, San Mateo, California 94404, and our telephone number is
(650) 358-3456.

                       ----------------------------------

        AN INVESTMENT IN SCICLONE COMMON STOCK INVOLVES A HIGH DEGREE OF RISK.
PLEASE CAREFULLY CONSIDER THE INFORMATION UNDER THE HEADING "RISK FACTORS"
BEGINNING ON PAGE 3.

                       ----------------------------------

        NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED THESE SECURITIES , OR DETERMINED IF THIS
PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

                       ----------------------------------

        THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED.
WE MAY NOT SELL THESE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED WITH THE
SEC IS EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER TO SELL THESE SECURITIES AND
IT IS NOT SOLICITING AN OFFER TO BUY THESE SECURITIES IN ANY STATE WHERE THE
OFFER OR SALE IS NOT PERMITTED.



               The date of this prospectus is ____________, 1999.



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<PAGE>   4



                                      TABLE OF CONTENTS


<TABLE>
<S>                                                                           <C>
Risk Factors ..............................................................    3

   We Are Dependent on Two Lead Drugs, ZADAXIN and CPX ....................    3

   We Have No History of Significant Revenues and We Expect
       Continuing Operating Losses ........................................    3

   We Will Need Additional Capital in the Future and the Availability
       of Such Capital is Uncertain .......................................    3

   We Must Continue to Comply With Certain Nasdaq Listing
       Requirements .......................................................    4

   Possibility of Dilution to Our Current Shareholders and Decrease in
       the Market Price of Our Common Stock ...............................    5

   We Are Dependent on Third Parties for Certain Product Rights ...........    5

   There Are Inherent Risks of Our Foreign Sales and Operations ...........    5

   We Have Limited Patent Protection for Our Proprietary Rights ...........    6

   There is Extensive Government Regulation in the Pharmaceutical
       Industry and it Can Be Difficult to Obtain Product Approvals .......    6

   We Are Dependent on Our Manufacturing and Supply Relationships .........    7

   We Are Dependent on Our Marketing and Sales Relationships ..............    7

   Technology Changes Rapidly in the Pharmaceutical Industry ..............    7

   There is Intense Competition in the Pharmaceutical Industry ............    7

   Third Party Reimbursement is Uncertain, as is Patients' Ability to
       Pay for Our Drugs ..................................................    7

   We Are Dependent on Qualified Personnel and Key Individuals ............    7

   We Have Limited Product Liability Insurance ............................    8

   Issuing Preferred Stock Could Adversely Affect Holders of
       Common Stock or Prevent Takeover Attempts ..........................    8

About SciClone ............................................................    9

Use of Proceeds ...........................................................   11

Selling Shareholder .......................................................   11

Plan of Distribution ......................................................   12

Legal Matters .............................................................   13

Experts ...................................................................   13

Where to Find More Information ............................................   14

Documents Incorporated By Reference .......................................   14
</TABLE>




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<PAGE>   5



                                  RISK FACTORS

        You should carefully consider the following risk factors, together with
the other information contained or incorporated by reference in this prospectus,
in evaluating whether to purchase shares of our common stock.

        This prospectus contains forward-looking statements within the meaning
of Section 27A of the Securities Act of 1934, as amended, and Section 21E of the
Securities Exchange Act and we have attempted to identify such statements with
an asterisk ("*"). Actual results could differ materially from those projected
in these forward-looking statements due to a variety of factors, including those
set forth below.

        WE ARE DEPENDENT ON TWO LEAD DRUGS, ZADAXIN AND CPX. Our principal drug
development efforts currently focus on our two lead drugs, ZADAXIN thymosin
alpha 1 and CPX. Clinical trials of ZADAXIN are in progress and we need
favorable results from these trials to get regulatory approval in major
pharmaceutical markets. ZADAXIN has been approved for commercial sale in 13
countries. However, we may not be able to obtain approvals for ZADAXIN in other
countries or for the treatment of additional medical conditions, such as cancer.

        Our launch of ZADAXIN in the People's Republic of China, the Philippines
and Singapore was our first commercial introduction of ZADAXIN, and may not be
successful. Moreover, our future launches of ZADAXIN in Argentina, Cambodia,
Italy, Kuwait, Mexico, Myanmar, Pakistan, Peru and/or Vietnam may not be
successful in these countries or in any additional countries. Future sales of
ZADAXIN will depend on market acceptance and successful distribution.

        In particular, although the People's Republic of China has the highest
prevalence of hepatitis B in the world, its low average income and poorly
developed distribution infrastructure may make it difficult to successfully
commercialize ZADAXIN in the Chinese market. Because we currently rely on
ZADAXIN as our sole source of revenue, our failure to demonstrate its efficacy
in future clinical trials, obtain additional marketing approvals or successfully
commercialize ZADAXIN would have a material adverse effect on our business.

        We may experience delays and difficulties in clinical trials of CPX, our
drug in phase 2 clinical development for treatment of cystic fibrosis. In
addition, clinical trials may not prove that CPX is an effective treatment for
cystic fibrosis. Our failure to demonstrate the safety and efficacy of CPX as a
treatment for cystic fibrosis in a clinical trial, obtain regulatory approval of
CPX as a treatment for cystic fibrosis or successfully commercialize CPX could
have a material adverse effect on our business.

        WE HAVE NO HISTORY OF SIGNIFICANT REVENUES AND WE EXPECT CONTINUING
OPERATING Losses. We have only recently begun to generate revenues from ZADAXIN,
and future revenues are uncertain. Marketing approvals for CPX and additional
marketing approvals for ZADAXIN are uncertain. We have experienced significant
operating losses since our inception and have a substantial accumulated deficit.
We expect our operating expenses to increase over the next several years as we
expand our development, clinical testing and marketing capabilities.* Our
ability to become profitable depends in large part on our ability to do the
following:

        (1)    obtain additional financing to support current operations,
               long-term product development, and commercialization efforts;

        (2)    increase ZADAXIN sales in existing markets;

        (3)    launch ZADAXIN in newly-approved markets;

        (4)    obtain additional regulatory approvals for ZADAXIN and/or future
               products;

        (5)    enter into a corporate partnering arrangement for development in
               the U.S. and Europe of a combination therapy for hepatitis C
               including ZADAXIN plus interferon; and

        (6)    enter into other agreements for product development and
               commercialization.

        WE WILL NEED ADDITIONAL CAPITAL IN THE FUTURE AND THE AVAILABILITY OF
SUCH CAPITAL IS UNCERTAIN. Since inception, we have financed our operations
primarily through sales of stock. Without additional financing,



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management believes we have enough capital resources to maintain our current and
planned operations only through June 1999. As a result, our independent auditors
have issued an opinion for our financial statements for the period ended
December 31, 1998 that includes a paragraph emphasizing the uncertainty
surrounding our ability to continue as a going concern. However, we will need to
obtain additional financing before June 1999 to support our product development
and commercialization programs.

        We are considering corporate partnering, sales of stock by private
placement or under the equity line, and other opportunities, including debt
instruments, to increase our capital resources. However, our need for capital
will depend on many factors, including:

        (1)    the level of ZADAXIN sales;

        (2)    preclinical and clinical development expenses and opportunities;

        (3)    the timing and cost of regulatory approvals;

        (4)    patent costs;

        (5)    our ability to use the equity line; and

        (6)    our ability to establish development, sales, manufacturing and
               marketing arrangements.

Other than the equity line, we have no commitments or arrangements for
additional funding and we may not be able to obtain the financing we need. Draws
under the equity line are subject to certain conditions, including:

        (1)    registration of the investor's resale of the shares;

        (2)    a minimum trading price per share;

        (3)    volume limitations;

        (4)    limitations on the number of shares that can be issued without
               shareholder approval; and

        (5)    limitations on the number of shares of our common stock the
               investor may hold at any time.

Unless we and the investor agree otherwise, the equity line is not available
when our stock is trading under $1.50 per share. We have orally agreed with the
investor to decrease this price to $1.00. The unavailability or timing of
financing could prevent or delay our product development and commercialization
programs and would require us to curtail or cease our operations.

        WE MUST CONTINUE TO COMPLY WITH CERTAIN NASDAQ LISTING REQUIREMENTS. Our
common stock is listed on the Nasdaq National Market to remain listed on the
Nasdaq a company must meet certain criteria, including:

        (1)    a minimum bid price of $1.00 per share;

        (2)    $4,000,000 in net tangible assets; and

        (3)    $5,000,000 market value of the public float (excluding shares
               held directly or indirectly by any of our officers or directors
               and by anyone holding beneficially more than 10% of our
               outstanding shares).

        As of April 26, 1999 the closing bid price of our common stock was
$1.53. As of March 31, 1999, we had net tangible assets of $6,688,000.

        If we fail to meet Nasdaq's listing criteria our common stock may be
delisted. Our common stock would thereafter be traded in the non-Nasdaq,
over-the-counter market. If our common stock were delisted, it may be



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more difficult to dispose of, or get an accurate market value of, our common
stock. This could severely limit our common stockholders' ability to sell our
common stock in the secondary market.

        POSSIBILITY OF DILUTION TO OUR CURRENT SHAREHOLDERS AND DECREASE IN THE
MARKET PRICE OF OUR COMMON STOCK. If we sell common stock under the equity line,
the percentage ownership of our then-current shareholders will be reduced. In
connection with the equity line, we also issued to the purchaser a warrant to
purchase 200,000 shares of our common stock at an exercise price of $5.53 per
share. We will also issue to the purchaser additional warrants to purchase up to
300,000 shares of common stock at an exercise price of 150% of the weighted
average purchase price of the common stock issued under the equity line during
the year for which an additional warrant is issued. If we do not issue any
common stock under the equity line, the exercise price will be 150% of the
closing sale price of the common stock on the day before the end of the two-year
term of the equity line. The purchaser's resale of common stock acquired under
the equity line could depress the market price of the common stock. Moreover,
because the shares that may be issued under the equity line, along with the
shares issuable upon exercise of the warrant and additional warrants, can be
immediately resold by the purchaser, the possibility of such sales could
adversely affect the market price of the common stock.

        Similarly, if we raise additional funds through the issuance of stock or
securities convertible into or exercisable for stock, the percentage ownership
of our then-current shareholders will be reduced.

        WE ARE DEPENDENT ON THIRD PARTIES FOR CERTAIN PRODUCT RIGHTS. Our
strategy includes entering into various corporate partnering arrangements. To
date, we have acquired rights to ZADAXIN, CPX and certain other drugs but we are
only actively pursuing clinical development of ZADAXIN and CPX. If we do not
license or otherwise acquire rights to additional drugs we may have a shortage
of drugs to develop. In addition, we have exclusively sublicensed our rights to
develop and market ZADAXIN in Japan to Schering-Plough K.K. However,
Schering-Plough K.K. already has a substantial commitment to alpha interferon,
which is an approved therapy for hepatitis B and hepatitis C in Japan. Our
relationship with Schering-Plough K.K. may not be successful and we may not be
able to negotiate similar additional arrangements in the future. We generally do
not have control over the amount and timing of resources that our collaborators
devote to their activities with us. Such parties may not perform their
obligations as we expect them to.

        Our ability to obtain regulatory approval in one country may be delayed
or adversely affected by the timing of regulatory activities and approvals in
other countries, particularly if we do not participate in the regulatory
approval process in such other countries.

        THERE ARE INHERENT RISKS OF OUR FOREIGN SALES AND OPERATIONS. Our
financial condition in the near term is highly dependent on ZADAXIN sales in
foreign jurisdictions. Our sales and operations in these jurisdictions are
subject to inherent risks, including:

        (1)    difficulties and delays in obtaining pricing approvals and
               reimbursement;

        (2)    difficulties and delays in obtaining product health registration
               and importation permits;

        (3)    unexpected changes in regulatory requirements;

        (4)    tariffs and other barriers;

        (5)    political instability;

        (6)    the difficulties of staffing and managing foreign operations;

        (7)    long payment cycles;

        (8)    difficulty in accounts receivable collection;

        (9)    currency fluctuations; and

        (10)   potential adverse tax consequences.



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<PAGE>   8

Certain countries regulate pharmaceutical prices. This regulation may reduce
prices for our products significantly below those that would prevail in a free
market. The majority of our current sales are to customers in the People's
Republic of China.

        WE HAVE LIMITED PATENT PROTECTION FOR OUR PROPRIETARY RIGHTS. The United
States composition of matter patent and most of the European composition of
matter patents for thymosin alpha 1 have expired. Going forward, we will have
only limited composition of matter patents for thymosin alpha 1 and this could
adversely affect our proprietary rights. However, we own or have exclusive
licenses for use and/or process patents or patent applications in the United
States, Europe, Japan and other jurisdictions for thymosin alpha 1, and for CPX
in the United States. We will seek to protect such products from competition
through patent protection and other means. Our success depends significantly on
our ability to obtain patent protection for our products and technologies, to
preserve our trade secrets and to avoid infringing on the proprietary rights of
third parties. However, our pending patent applications may not result in issued
patents. Any patents that are issued may not provide a competitive advantage to
us or may be invalidated or circumvented by our competitors. Patents issued to
or patent applications filed by other companies could have an adverse effect on
our ability to use, manufacture or market our products or maintain our
competitive position with respect to our products. Many of our patents and
patent applications relating to thymosin alpha 1 are held under exclusive
licenses. If we breach the terms of any of these licenses we could lose our
rights to these patents and patent applications. Other companies obtaining
patents on products or processes useful to us may bring infringement actions
against us. Such litigation is typically costly and time-consuming and could
require us to obtain licenses from others, or prevent us from using,
manufacturing or marketing our products. Such licenses may not be available on
commercially reasonable terms, if at all.

        The legal protection provided by patents to biotechnology firms is
highly uncertain and involves complex legal and factual questions. No consistent
policy has emerged regarding the validity and scope of claims in biotechnology
patents, and courts recently have issued varying interpretations. Legal
standards concerning the validity, scope and interpretation of claims in
biotechnology patents may continue to evolve. Issued patents may be modified or
revoked by the United States Patent and Trademark Office, the European Patent
Office or the courts in proceedings brought by third parties. Moreover, the
issuance of a patent in one country does not assure the issuance of a similar
patent in another country. Claim interpretation and infringement laws vary by
nation, so the extent of any patent protection is uncertain and may vary in
different jurisdictions.

        Pharmaceuticals are not patentable or have only recently become
patentable in certain countries in the territory in which we have exclusive
rights to ZADAXIN. Enforcement of intellectual property rights in many countries
in this territory has been limited or non-existent. Future enforcement of
patents and proprietary rights in many countries in this territory will likely
be problematic or unpredictable. Therefore, patents issued or licensed to us in
these countries may not provide competitive advantages or may be challenged by
others. Holders of patents licensed to us may not file, prosecute, extend or
maintain their patents in countries where we have rights. Finally, others may
independently develop similar products or design around patents issued or
licensed to us.

        THERE IS EXTENSIVE GOVERNMENT REGULATION IN THE PHARMACEUTICAL INDUSTRY
AND IT CAN BE DIFFICULT TO OBTAIN PRODUCT APPROVALS. The research, preclinical
and clinical development, manufacturing, marketing and sale of pharmaceuticals,
including ZADAXIN, CPX and our other drug candidates, are subject to extensive
regulation by governmental authorities. Products we develop must be approved
before they can be marketed commercially in any jurisdiction. The process of
obtaining these regulatory approvals is time-consuming and expensive. In some
countries where we are contemplating marketing ZADAXIN, the regulatory approval
process for drugs that have not been previously approved in countries with
established clinical trial review procedures is uncertain, and this may delay
the grant of regulatory approvals.

        We are currently sponsoring clinical trials and pursuing regulatory
approvals for ZADAXIN in a number of countries and we are currently sponsoring
clinical trials of CPX in the United States. However, we may not be able to
complete these trials, and even if completed, these trials may not fulfill the
relevant regulatory approval criteria. We ultimately may not be able to obtain
regulatory approvals in these countries. Adverse results in our development
programs also could result in restrictions on the use of ZADAXIN and, if
approved, CPX.



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        Our failure to comply with applicable United States or foreign
regulatory requirements could, among other things, result in warning letters,
fines, suspensions of regulatory approvals, product recalls or seizures,
operating restrictions, injunctions and criminal prosecutions. In addition,
government regulations may be established or imposed which prevent or delay
regulatory approval of ZADAXIN, CPX or our future products.

        WE ARE DEPENDENT ON OUR MANUFACTURING AND SUPPLY RELATIONSHIPS. We have
entered into contract manufacturing and supply agreements for ZADAXIN and CPX.
To be successful, our products must be manufactured in commercial quantities, in
compliance with regulatory requirements and at an acceptable cost. While we
believe we have and will be able to establish and maintain manufacturing
relationships with experienced suppliers*, we may not be able to establish
long-term manufacturing relationships with such suppliers. We currently have
vialing and packaging supply agreements in effect and a sufficient supply of
finished ZADAXIN for the near term. We have recently changed and upgraded our
manufacturing source of finished ZADAXIN for our international markets,
excluding Japan. In certain countries, this change may require additional
regulatory approvals. If we do not obtain any required regulatory approvals of
this manufacturing change in a timely fashion, new ZADAXIN marketing approvals
may be delayed or sales may be interrupted until the manufacturing change is
approved.

        Production interruptions, if any, could significantly delay clinical
development of potential products and reduce third party or clinical researcher
interest and support of proposed trials. Such interruptions could also impede
commercialization of our products, including sales of ZADAXIN in approved
markets, and impair their competitive position, which would have a material
adverse effect on our business.

        WE ARE DEPENDENT ON OUR MARKETING AND SALES RELATIONSHIPS. We have
arrangements with local pharmaceutical importers and distribution companies
covering countries in Asia, Latin America and the Middle East. However, we may
not be able to maintain such distribution arrangements or exploit them
successfully.

        TECHNOLOGY CHANGES RAPIDLY IN THE PHARMACEUTICAL INDUSTRY. Due to the
rapid development of pharmaceutical technology, our products may become obsolete
before they are marketed or before we recover a significant portion of our
development and commercialization expenses.

        THERE IS INTENSE COMPETITION IN THE PHARMACEUTICAL INDUSTRY. Competition
in the pharmaceutical industry is intense and we expect that competition to
increase. We believe that the principal competitive factors in the
pharmaceutical industry include the efficacy, safety, price and therapeutic
regimen associated with a given drug. Our competitors include pharmaceutical
companies, biotechnology firms, universities and other research institutions,
both in the United States and abroad, that are actively engaged in research and
development of products in the therapeutic areas we are pursuing. Most of our
competitors have substantially greater financial, technical, regulatory,
manufacturing, marketing and human resource capabilities than we do. Most of
them also have extensive experience in undertaking the clinical testing and
obtaining the regulatory approvals necessary to market drugs.

        THIRD PARTY REIMBURSEMENT IS UNCERTAIN, AS IS PATIENTS' ABILITY TO PAY
FOR OUR DRUGS. Our ability to successfully commercialize our products depends in
part on whether pharmaceutical drug consumers will be reimbursed for the cost of
our products. Such reimbursement may come from government health administration
authorities, private health insurers and other organizations. Third-party
reimbursement for new therapeutic products is highly uncertain and may not be
available for our future products. In many of the foreign countries in which we
intend to operate, reimbursement for ZADAXIN under government or private health
insurance programs will not be available. In the United States, certain proposed
health care reforms could limit the amount of third-party reimbursement
available for our products. In many countries where we have marketing rights to
ZADAXIN, government resources and per capita income may be so low that our
products will be prohibitively expensive. In such countries, we may not be able
to market our products on economically favorable terms, if at all.

        WE ARE DEPENDENT ON QUALIFIED PERSONNEL AND KEY INDIVIDUALS. We are
highly dependent upon our ability to attract and retain qualified personnel
because of the specialized, scientific and international nature of our business.
There is intense competition for qualified management, scientific and technical
personnel in the



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<PAGE>   10

pharmaceutical industry, and we may not be able to attract and retain the
qualified personnel we need to grow and develop our business globally. In
addition, many key responsibilities at SciClone are assigned to a relatively
small number of individuals. If any of these individuals left -- unless they
were promptly replaced -- such departures could adversely affect our business.
We do not maintain "key person" life insurance on any of our key personnel.

        WE HAVE LIMITED PRODUCT LIABILITY INSURANCE. Companies which test,
manufacture, market and sell pharmaceutical products commonly receive product
liability claims. Such claims may be asserted against us. Product liability
insurance for the pharmaceutical industry generally is expensive, if it is
available at all. We have product liability insurance coverage for our clinical
trials and commercial sales. However, product liability claims could adversely
affect our business.

        ISSUING PREFERRED STOCK COULD ADVERSELY AFFECT HOLDERS OF COMMON STOCK
OR PREVENT TAKEOVER ATTEMPTS. Our charter documents give our board of directors
the authority to issue additional series of preferred stock without a vote or
action by our shareholders. The board also has the authority to determine the
terms of preferred stock, including price, preferences and voting rights. The
rights of holders of our common stock may be adversely affected by the rights
granted to holders of preferred stock. For example, a series of preferred stock
may be granted the right to receive a liquidation preference -- a pre-set
distribution in the event SciClone is liquidated -- that would reduce the amount
available for distribution to holders of common stock. In addition, the issuance
of preferred stock could make it more difficult for a third party to acquire a
majority of our outstanding voting stock.









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                                 ABOUT SCICLONE


GENERAL

        SciClone acquires, develops and commercializes drugs for treating
chronic and life-threatening diseases such as hepatitis B, hepatitis C, cancer,
immune system disorders and cystic fibrosis. We have two drugs in clinical
testing, ZADAXIN and CPX, and we have other potential drugs in preclinical
development.

        ZADAXIN. Our lead drug is ZADAXIN, which boosts the immune system. We
are pursuing development of ZADAXIN for treatment of hepatitis B, hepatitis C,
cancer and certain immune system disorders, as well as an enhancement to the
effectiveness of viral vaccines. ZADAXIN is approved for marketing in 13
countries: Argentina, Cambodia, Italy, Kuwait, Mexico, Myanmar, Pakistan, the
People's Republic of China, Peru, the Philippines, Singapore, Venezuela and
Vietnam. We have filed for approval to market ZADAXIN in 19 additional countries
outside the U.S., Europe and Japan. In 1998, ZADAXIN generated over $3.6 million
in sales, primarily in the People's Republic of China, the Philippines and
Singapore for treatment of hepatitis B. We hold worldwide development,
manufacturing and marketing rights to ZADAXIN. In Japan, we have sublicensed our
rights to Schering-Plough, K.K., the Japanese subsidiary of Schering-Plough
Corporation, the leading marketer of viral hepatitis therapies worldwide.

        We are pursuing a corporate partnering arrangement for development in
the U.S. and Europe of a combination therapy for hepatitis C including ZADAXIN
plus interferon.* Hepatitis C affects over 170 million people worldwide,
including over 10 million people in the United States, Europe and Japan, which
are the world's largest pharmaceutical markets. Our clinical data show that the
combination of ZADAXIN plus interferon could be a significant therapeutic
advance in the fight against the hepatitis C epidemic. Interferon, the only
established therapy for hepatitis C, leads to a sustained positive response in
only 5% to 20% of patients and causes unpleasant side effects. Interferon plus
ribavirin, a nucleoside analogue, was approved for treatment of hepatitis C in
the U.S. and certain other countries in 1998. This combination benefits certain
patients. However, ribavirin has its own potential side effects, and increases
the risk of side effects when combined with interferon. Importantly, ZADAXIN
combined with interferon has shown clinical promise for treatment of hepatitis C
without increasing the risk of additive side effects.

        In Japan, the world's largest market for viral hepatitis therapies, we
have exclusively sublicensed our rights to develop and market ZADAXIN to
Schering-Plough K.K. In the second quarter of 1998, Schering-Plough K.K. began a
300-patient pivotal phase 3 study of ZADAXIN monotherapy for treatment of
hepatitis B. Interferon monotherapy, including Schering-Plough K.K.'s
interferon, is the established first-line therapy for hepatitis B in Japan.
Schering-Plough K.K. is also developing ZADAXIN in a phase 2 program for
treatment of hepatitis C.

        CPX. Our second drug in clinical testing is CPX. CPX is a protein-repair
therapy initially developed by the United States National Institutes of Health
as a potential treatment for cystic fibrosis, the most common fatal genetic
disease in the U.S. and Europe.

        Cystic fibrosis is caused by mutations in the gene that encodes a
certain protein -- the cystic fibrosis transmembrane conductance regulator, or
CFTR protein. More than 70% of cystic fibrosis patients have a certain type of
mutation, referred to as the "delta F508" mutation. In October 1997, Dr. Harvey
Pollard of the Uniformed Services University of the Health Sciences and formerly
of the NIH, presented breakthrough preclinical data demonstrating that CPX
repairs the two key protein defects causing cystic fibrosis in patients with the
delta F508 mutation -- impaired chloride ion transport and abnormal CFTR protein
trafficking. CPX is the only drug in clinical development with the potential to
correct these two key protein-associated defects in most cystic fibrosis
patients. We have obtained orphan drug designation for CPX from the United
States Food and Drug Administration. In 1997, we were awarded a $100,000 Orphan
Drug Grant by the FDA for phase 1 development of CPX as a treatment for cystic
fibrosis. We completed phase 1 development of CPX in cystic fibrosis patients in
April 1998. In October 1998, we were awarded a prestigious $200,000 Orphan Drug
Grant by the FDA for phase 2 development of CPX as a treatment for cystic
fibrosis. We began phase 2 development of CPX in cystic fibrosis



                                       9
<PAGE>   12

patients in the U.S. in September 1998. The Cystic Fibrosis Foundation provided
substantial financial support for early research on CPX at the NIH. The Cystic
Fibrosis Foundation also supported us in our application for an Investigational
New Drug exemption to gain approval from the FDA to begin testing of CPX
directly on cystic fibrosis patients rather than the standard process of testing
first in healthy volunteers. The Cystic Fibrosis Foundation continues to support
us with protocol review, patient recruitment and investigator and study center
selection.

        We have other drug candidates in early preclinical development. We plan
to continue to evaluate the pharmaceutical potential of our preclinical drug
candidates in 1999.

        Internationally, we have 41 ZADAXIN distribution arrangements covering
46 countries outside the U.S., Europe and Japan. We intend to out-license our
products where a collaborative arrangement will materially enhance the prospects
for a drug's commercial success in licensed markets. Our license with
Schering-Plough K.K. for exclusive rights to develop and market ZADAXIN in
Japan, and our arrangements with our ZADAXIN distributors are examples of this
strategy. We are currently pursuing corporate partnering arrangements in the
U.S. and Europe for development of ZADAXIN, particularly the combination of
ZADAXIN plus interferon for the treatment of hepatitis C. We intend to produce
ZADAXIN, CPX and any future products through contract manufacturing and supply
agreements. We have entered into separate supply agreements in the U.S. and
Europe for the supply of bulk and finished product thymosin alpha 1. We contract
with a major U.S. pharmaceutical company for the supply of bulk CPX and another
U.S. pharmaceutical manufacturer for finished product CPX.

AGREEMENT WITH SCLAVO

        In April 1998, we entered into an agreement with Sclavo S.p.A. to
acquire all of Sclavo's rights to develop and market ZADAXIN in Italy, Spain and
Portugal. The transaction closed in September 1998. The rights we acquired
include an approval to market ZADAXIN in Italy as an influenza vaccine adjuvant
and an application to market ZADAXIN as a treatment for non small-cell lung
cancer in combination with chemotherapy. We paid approximately $1.84 million for
these rights, consisting of (1) approximately $296,000 in cash, (2) 375,000
shares of our common stock (valued at $1.54 million based on the closing sale
price on April 20, 1998) and (3) a warrant to purchase another 375,000 shares of
our common stock. The exercise price of the shares that may be purchased upon
exercise of the warrant is $4.125 per share, subject to certain standard
adjustments. The warrant is exercisable until June 29, 2003.

        Under the agreement with Sclavo, we agreed to register the 375,000
issued shares and 375,000 warrant shares promptly following the closing of the
transaction and to keep a registration statement covering all 750,000 shares
effective for one year following the closing. Solar Developments and Partners,
Sclavo's designee and the selling shareholder, has agreed not to sell any of the
375,000 issued shares until May 5, 1999.

FIRST QUARTER RESULTS

        We reported revenue of $1,777,000 in the first quarter ended March 31,
1999, compared to $554,000 in the year-earlier quarter ended March 31, 1998. Our
net loss in the first quarter ended March 31, 1999 was $2,623,000 ($0.13 per
share). Our net loss in the first quarter ended March 31, 1998 was $3,685,000
($0.24 per share).

FORMATION AND OTHER INFORMATION

        SciClone was incorporated in California in 1990. Our international
operating subsidiary, SciClone Pharmaceuticals International Ltd., is
incorporated in the Cayman Islands and headquartered in Hong Kong. We also have
office locations in Singapore, Taiwan and Japan.



                                       10
<PAGE>   13



                                 USE OF PROCEEDS

        If the warrants are exercised by the selling shareholder, we may receive
proceeds in the form of the exercise price. If we receive any such proceeds, we
expect to use them for working capital. We will not receive any proceeds from
the sale of the shares of common stock by the selling shareholder and all
proceeds will go to the selling shareholder to be used for its own purposes.

                               SELLING SHAREHOLDER

        The selling shareholder owns or has the right to acquire shares of our
common stock which were issued or are issuable upon exercise of a warrant issued
in connection with our acquisition of certain rights to ZADAXIN in Italy, Spain
and Portugal. The table below sets forth the selling shareholder, the number of
shares of common stock which it owns or has the right to acquire as of April 26,
1999, the number of shares of common stock subject to sale under this prospectus
and the number of shares of common stock it would own assuming the sale of all
shares of common stock covered by this prospectus.

        Beneficial ownership is determined in accordance with rules promulgated
by the SEC, and the information is not necessarily indicative of beneficial
ownership for any other purpose. This table is based upon information supplied
to us by Sclavo. Except as otherwise indicated, we believe that the person named
in the table has sole voting and investment power with respect to all of the
shares of our common stock listed as beneficially owned by it.

<TABLE>
<CAPTION>
                                                  Shares                             Shares
                                               Beneficially     Shares Offered    Beneficially
                                              Owned Prior to       by this         Owned After
         Selling Shareholder                   the Offering       Prospectus      the Offering
         -------------------                  --------------    --------------    ------------
<S>                                             <C>               <C>                  <C>
Solar Developments and Partners(1)              750,000(2)        750,000(2)           --
</TABLE>

- ------------------

(1)  Solar Developments and Partners is a designee of Sclavo pursuant to our
     agreement with Sclavo, and Sclavo disclaims beneficial ownership of the
     shares offered by this prospectus.

(2)  The number of shares set forth in the table represents the maximum number
     of shares of common stock to be offered by the selling shareholder. 375,000
     shares were issued, and up to 375,000 shares are issuable upon exercise of
     a warrant issued under our agreement with Sclavo.





                                       11
<PAGE>   14



                              PLAN OF DISTRIBUTION

        The selling shareholder has informed us that, acting as principal for
its own account, directly, through agents designated from time to time, or
through brokers, dealers, agents or underwriters also to be designated, may sell
all or a portion of the shares from time to time on terms to be determined at
the time of sale. The selling shareholder may from time to time sell all or a
portion of the shares in routine brokerage transactions on the Nasdaq Stock
Market or otherwise at the prices and terms prevailing at the time of the sale.
The selling shareholder also may make private resales directly or through
brokers or may make resales pursuant to Rule 144 under the Securities Act. Under
the agreement with Sclavo, we agreed to register the 750,000 shares promptly
following the closing of the transaction and to keep a registration statement
covering these shares effective for one year following the closing. Solar
Developments and Partners, Sclavo's designee has agreed not to sell any of the
375,000 shares it was issued until May 5, 1999. The selling shareholder may pay
customary brokerage fees, commissions and expenses.

        To the extent required pursuant to Rule 424 under the Securities Act, a
prospectus supplement will be filed with the SEC with respect to a particular
offering setting forth the terms of any offering, including the name or names of
any underwriters or agents, if any, any underwriting discounts and other items
constituting underwriters' compensation, the offering price and any discounts or
concessions allowed or reallowed or paid to dealers. Any offering price and any
discounts or concessions allowed or reallowed or paid to dealers may be changed
from time to time.

        If underwriters are used in a sale, shares of common stock will be
acquired by the underwriters for their own account and may be resold from time
to time in one or more transactions, including negotiated transactions, at a
fixed public offering price or at varying prices determined at the time of sale.
The shares may be offered to the public either through underwriting syndicates
represented by one or more managing underwriters or directly by one or more
firms acting as underwriters. The underwriter or underwriters with respect to a
particular underwritten offering of shares to be named in the prospectus
supplement relating to such offering and, if an underwriting syndicate is used,
the managing underwriter or underwriters, will be set forth on the cover of such
prospectus supplement. Unless otherwise set forth in the prospectus supplement
relating thereto, the obligations of the underwriters to purchase the shares
will be subject to conditions precedent and the underwriters will be obligated
to purchase all of the shares if any are purchased.

        If dealers are utilized in the sale of shares of common stock in respect
of which this prospectus is delivered, the selling shareholder will sell such
shares to the dealers as principals. The dealers may then resell such shares to
the public at varying prices to be determined by such dealers at the time of
resale. The names of the dealers and the terms of the transaction will be set
forth in a prospectus supplement relating thereto.

        If an agent (other than a broker-dealer executing transactions in the
ordinary course) is used, the agent will be named, and the terms of the agency
and any commissions will be set forth in a prospectus supplement relating
thereto. Unless otherwise indicated in the prospectus supplement, any such agent
will be acting on a best efforts basis for the period of its appointment.

        Shares may be sold directly by the selling shareholder to institutional
investors or others, who may be deemed to be underwriters within the meaning of
the Securities Act with respect to any resale thereof. The terms of any such
sales, including the terms of any bidding or auction process, will be described
in the prospectus supplement relating thereto.

        Agents, dealers and underwriters may be entitled under agreements
entered into with the selling shareholder to indemnification against certain
civil liabilities, including liabilities under the Securities Act, or to
contribution with respect to payments which such agents, dealers or underwriters
may be required to make in respect thereof. Agents, dealers and underwriters may
be customers of, engage in transactions with, or perform services for us or the
selling shareholder in the ordinary course of business.

        We will pay all expenses related to the registration of the shares
covered by this prospectus, including: (1) registration and filing fees imposed
by the Securities and Exchange Commission, the National Association of



                                       12
<PAGE>   15

Securities Dealers, Inc. and blue sky laws; (2) printing expenses; (3) transfer
agents' and registrars' fees; and (4) the reasonable fees and costs of our
outside counsel and independent accountants. We will not pay transfer or other
taxes and other costs related to the issuance of the shares.

        The selling shareholder is not restricted as to the price or prices at
which it may resell the shares. Such resales may have an adverse effect on the
market price of the common stock. In addition, it is possible that a significant
number of shares could be sold at the same time, which also may have an adverse
effect on the market price of the common stock.

        We have agreed to indemnify the selling shareholder against certain
civil liabilities, including liabilities under the Securities Act.

                                  LEGAL MATTERS

        The legality of the shares offered by this prospectus is being passed
upon by Gray Cary Ware & Freidenrich LLP, Palo Alto, California.

                                     EXPERTS

        The consolidated financial statements and schedule of SciClone appearing
in its Annual Report (Form 10-K) for the year ended December 31, 1998 have been
audited by Ernst & Young LLP, independent auditors, as set forth in their report
thereon (which contain an explanatory paragraph describing conditions that raise
substantial doubt about SciClone's ability to continue as a going concern as
described in Note 1 to the consolidated financial statements), included therein
and incorporated herein by reference. Such consolidated financial statements and
schedule are incorporated herein by reference in reliance upon such report given
on the authority of such firm as experts in accounting and auditing.






                                       13
<PAGE>   16



                         WHERE TO FIND MORE INFORMATION

        We file annual, quarterly and special reports, proxy statements (if
required) and other information with the SEC. These reports, proxy statements
and other information filed with the SEC may be inspected and copied at the SEC
Public Reference Room, 450 Fifth Street, N.W., Washington, D.C. 20549.

        You may obtain information about the operation of the SEC Public
Reference Room by calling 1-800-SEC-0330. You can also inspect this material
free of charge at a Web site maintained by the SEC at http://www.sec.gov.
Finally, you can also inspect reports and other information concerning SciClone
at the offices of the National Association of Securities Dealers, Inc., Market
Listing Section, 1735 K Street, N.W., Washington, D.C. 20006. SciClone common
stock is traded on The Nasdaq National Market under the symbol "SCLN."
SciClone's Web site is located at http://www.sciclone.com.

                       DOCUMENTS INCORPORATED BY REFERENCE

        The following documents filed by us with the SEC are incorporated in
this prospectus by reference:

        1.     Current Report on Form 8-K, filed on April 26, 1999;

        2.     Annual Report on Form 10-K for the year ended December 31, 1998,
               filed on March 31, 1999;

        3.     The description of SciClone's Common Stock contained in
               SciClone's Registration Statement on Form 8-A filed under the
               Securities Exchange Act, including any amendment or report filed
               for the purpose of updating such description.

        All documents and reports filed by us pursuant to Sections 13(a), 13(c),
14 or 15(d) of the Securities Exchange Act of 1934, as amended, after the date
of this prospectus shall be deemed to be incorporated in this prospectus by
reference and to be a part of this prospectus from the date such documents or
reports are filed. Any statement contained in a document incorporated or deemed
incorporated in this prospectus by reference may be modified or superseded by
statements from our more recent filings with the SEC. We will provide free of
charge to each person, including any beneficial owner, to whom this prospectus
is delivered, upon written or oral request, a copy of any or all of the
foregoing documents incorporated by reference in this prospectus. Please direct
such requests to Investor Relations, SciClone Pharmaceuticals, Inc., 901
Mariners Island Boulevard, Suite 205, San Mateo, California 94404. Our telephone
number is (650) 358-3456.






                                       14
<PAGE>   17






NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR MAKE ANY REPRESENTATION
   OTHER THAN THOSE CONTAINED OR INCORPORATED BY REFERENCE IN THIS PROSPECTUS.
     IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATION MUST NOT BE RELIED
       UPON AS HAVING BEEN AUTHORIZED. THE INFORMATION IN THIS PROSPECTUS
          IS CORRECT AS OF THE DATE HEREOF. DELIVERY OF THIS PROSPECTUS
                  AFTER THE DATE HEREOF DOES NOT MEAN THAT THE
                          INFORMATION IS STILL CORRECT.


                                 750,000 SHARES


                         SCICLONE PHARMACEUTICALS, INC.

                                   ----------

                                  COMMON STOCK

                                   ----------

                                   PROSPECTUS


                              _______________, 1999




================================================================================
<PAGE>   18



                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

        The following table sets forth the costs and expenses in connection with
the sale and distribution of the securities being registered, other than
underwriting discounts and commissions. All of the amounts shown are estimates
except the Securities and Exchange Commission registration fees and Nasdaq
filing fee.

<TABLE>
<CAPTION>
                                                                     To be Paid
                                                                       By The
                                                                     Registrant
                                                                     ----------
<S>                                                                   <C>    
SEC Registration Fee                                                  $   592
Nasdaq filing fee                                                     $17,500
Accounting fees and expenses                                          $ 5,000
Legal fees and expenses                                               $25,000
Miscellaneous expenses                                                $ 1,908
        Total........................................................ $50,000
</TABLE>


ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

        As permitted by Section 204 of the California Corporations Code (the
"CCC"), the Registrant's Articles of Incorporation provide that each person who
is or was or who had agreed to become a director or officer of the Registrant or
who had agreed at the request of the Registrant's Board of Directors or an
officer of the Registrant to serve as an employee or agent of the Registrant or
as a director, officer, employee or agent of another corporation, partnership,
joint venture, trust or other enterprise, shall be indemnified by the Registrant
to the full extent permitted by the CCC or any other applicable laws. Such
Articles of Incorporation also provide that no amendment or repeal of such
Articles shall apply to or have any effect on the right to indemnification
permitted or authorized thereunder for or with respect to claims asserted before
or after such amendment or repeal arising from acts or omissions occurring in
whole or in part before the effective date of such amendment or repeal.

        The Registrant's Bylaws provide that the Registrant shall indemnify to
the full extent authorized by law any person made or threatened to be made a
party to an action or a proceeding, whether criminal, civil, administrative or
investigative, by reason of the fact that he, his testator or intestate was or
is a director, officer or employee of the Registrant or any predecessor of the
Registrant or serves or served any other enterprise as a director, officer or
employee at the request of the Registrant or an predecessor of the Registrant.
The Registrant's Bylaws also provide that the Registrant may enter into one or
more agreements with any person which provides for indemnification greater or
different than that provided in such Articles of Incorporation.

        The Registrant has entered into indemnification agreements with its
directors and certain of its officers.

        The Registrant intends to purchase and maintain insurance on behalf of
any person who is a director or officer against any loss arising from any claim
asserted against him and incurred by him in any such capacity, subject to
certain exclusions.

        See also the undertakings set out in response to Item 17 herein.



                                      II-1
<PAGE>   19

ITEM 16.  EXHIBITS.

        The following exhibits are filed with this Registration Statement:

<TABLE>
<CAPTION>
   EXHIBIT NO.                     DESCRIPTION OF EXHIBIT
   -----------                     ----------------------
<S>              <C>
      5.1        Opinion of Gray Cary Ware & Freidenrich LLP.

     10.1*       Acquisition Agreement between SciClone and Sclavo S.p.A., dated
                 April 20, 1998.

     10.2*       First Amendment to Acquisition Agreement between SciClone and
                 Sclavo S.p.A., dated April 20, 1998.

     10.3        Second Amendment to Acquisition Agreement by and among
                 SciClone, Sclavo S.p.A. and Solar Developments and Partners,
                 dated November 6, 1998.

     10.4        Amendment to Warrant by and among SciClone, Sclavo S.p.A. and
                 Solar Developments and Partners dated April 20, 1998.

     10.5*       Stock Purchase Warrant dated September 3, 1998

     23.1        Consent of Ernst & Young LLP, independent auditors.

     23.2        Consent of Gray Cary Ware & Freidenrich LLP (included in
                 Exhibit 5.1).

     24.1        Power of Attorney (included in the Signature Page contained in
                 Part II of the Registration Statement).
</TABLE>

- -------------------

*  Filed as an exhibit to the Company's Report on Form 10-Q for the period ended
   September 30, 1998.


ITEM 17.  UNDERTAKINGS.

        A.     The undersigned Registrant hereby undertakes:

        (1)    To file, during any period in which offers or sales are being
               made, a post-effective amendment to this registration statement:

               (i)    To include any prospectus required by section 10(a)(3) of
                      the Securities Act of 1933 (the "Securities Act");

               (ii)   To reflect in the prospectus any facts or events arising
                      after the effective date of the registration statement (or
                      the most recent post-effective amendment thereof) which,
                      individually or in the aggregate, represent a fundamental
                      change in the information set forth in the registration
                      statement. Notwithstanding the foregoing, any increase or
                      decrease in volume of securities offered (if the total
                      dollar value of securities offered would not exceed that
                      which was registered) and any deviation from the low or
                      high end of the estimated maximum offering range may be
                      reflected in the form of prospectus filed with the
                      Commission pursuant to Rule 424(b) if, in the aggregate,
                      the changes in volume and price represent no more than a
                      20% change in the maximum aggregate offering price set
                      forth in the "Calculation of Registration Fee" table in
                      the effective registration statement;



                                      II-2


                                       16
<PAGE>   20

               (iii)  To include any material information with respect to the
                      plan of distribution not previously disclosed in the
                      registration statement or any material change to such
                      information in the registration statement; provided,
                      however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not
                      apply if the information required to be included in a
                      post-effective amendment by those paragraphs is contained
                      in periodic reports filed by the Registrant pursuant to
                      Section 13 or Section 15(d) of the Securities Exchange Act
                      of 1934 that are incorporated by reference in the
                      registration statement.

        (2)    That, for the purpose of determining any liability under the
               Securities Act, each such post-effective amendment shall be
               deemed to be a new registration statement relating to the
               securities offered therein, and the offering of such securities
               at that time shall be deemed to be the initial bona fide offering
               thereof.

        (3)    To remove from registration by means of a post-effective
               amendment any of the securities being registered which remain
               unsold at the termination of the offering.

        B.     The undersigned Registrant hereby undertakes that, for purposes
        of determining any liability under the Securities Act, each filing of
        the Registrant's annual report pursuant to section 13(a) or section
        15(d) of the Securities Exchange Act of 1934 that is incorporated by
        reference in the registration statement shall be deemed to be a new
        registration statement relating to the securities offered therein, and
        the offering of such securities at that time shall be deemed to be the
        initial bona fide offering thereof.

        C.     The undersigned Registrant hereby undertakes to deliver or cause
        to be delivered with the prospectus, to each person to whom the
        prospectus is sent or given, the latest annual report to security
        holders that is incorporated by reference in the prospectus and
        furnished pursuant to and meeting the requirements of Rule 14a-3 or Rule
        14c-3 under the Securities Exchange Act of 1934; and, where interim
        financial information required to be presented by Article 3 of
        Regulation S-X are not set forth in the prospectus, to deliver, or cause
        to be delivered to each person to whom the prospectus is sent or given,
        the latest quarterly report that is specifically incorporated by
        reference in the prospectus to provide such interim financial
        information.

        D.     Insofar as indemnification for liabilities arising under the
        Securities Act may be permitted to directors, officers, and controlling
        persons of the Registrant pursuant to the foregoing provisions, or
        otherwise, the Registrant has been advised that in the opinion of the
        Securities and Exchange Commission such indemnification is against
        public policy as expressed in the Securities Act and is, therefore,
        unenforceable. In the event that a claim for indemnification against
        such liabilities (other than the payment by the Registrant of expenses
        incurred or paid by a director, officer, or controlling person of the
        Registrant in the successful defense of any action, suit, or proceeding)
        is asserted by such director, officer, or controlling person in
        connection with the securities being registered, the Registrant will,
        unless in the opinion of its counsel the matter has been settled by
        controlling precedent, submit to a court of appropriate jurisdiction the
        question whether such indemnification by it is against public policy as
        expressed in the Securities Act and will be governed by the final
        adjudication of such issue.




                                      II-3
<PAGE>   21

        E.     The undersigned Registrant hereby undertakes that:

        (1)    For the purposes of determining any liability under the
               Securities Act, the information omitted from the form of
               prospectus filed as part of this registration statement in
               reliance upon Rule 430A and contained in a form of prospectus
               filed by the Registrant pursuant to Rule 424(b)(1) or (4) or
               497(h) under the Securities Act shall be deemed to be part of the
               registration statement as of the time it was declared effective.

        (2)    For the purposes of determining any liability under the
               Securities Act, each post-effective amendment that contains a
               form of prospectus shall be deemed to be a new registration
               statement relating to the securities offered therein, and the
               offering of such securities at that time shall be deemed to be
               the initial bona fide offering thereof.














                                      II-4
<PAGE>   22



                                   SIGNATURES

        Pursuant to the requirements of the Securities Act of 1933, the
Registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-3 and has duly caused this registration
statement to be signed on its behalf by the undersigned, thereunto duly
authorized in the City of San Mateo, State of California on April 29, 1999.

                                       SCICLONE PHARMACEUTICALS, INC.

                                       By: /s/ Donald R. Sellers
                                           -------------------------------------
                                           Donald R. Sellers
                                           President and Chief Executive Officer

        KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below constitutes and appoints Donald R. Sellers and Shawn K. Singh, and
each of them, as his or her true and lawful attorneys-in-fact and agents, with
full power of substitution and resubstitution, for him or her and in his or her
name, place and stead, in any and all capacities, to sign any and all amendments
(including post-effective amendments) to this Registration Statement on Form
S-3, and to file the same, with all exhibits thereto, and other documents in
connection therewith, with the Securities and Exchange Commission, granting unto
said attorneys-in-fact and agents, and each of them, full power and authority to
do and perform each and every act and thing requisite and necessary to be done
in connection therewith, as fully to all intents and purposes as he or she might
or could do in person, hereby ratifying and confirming all that said
attorney-in-facts and agents, or either of them, or their or his substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.

        Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities and on the dates indicated:


<TABLE>
<CAPTION>
           SIGNATURE                              TITLE                        DATE

<S>                                   <C>                                 <C>
/s/ Donald R. Sellers                 President, Chief Executive          April 29, 1999
- ---------------------------------     Officer and Director (Principal
Donald R. Sellers                     Executive Officer)

/s/ Jere E. Goyan                     Chairman of the Board and Director  April 29, 1999
- ---------------------------------
Jere E. Goyan, Ph.D.

/s/ Diane Lee                         Director, Corporate Finance and     April 29, 1999
- ---------------------------------     Administration (Principal
Diane Lee                             Financial and Accounting Officer)

/s/ John D. Baxter                    Director                            April 29, 1999
- ---------------------------------
John D. Baxter, M.D.

                                      Director                            April 29, 1999
- ---------------------------------
Edwin C. Cadman, M.D.

/s/ Rolf H. Henel                     Director                            April 29, 1999
- ---------------------------------
Rolf H. Henel
</TABLE>








                                      II-5
<PAGE>   23



                                INDEX TO EXHIBITS

<TABLE>
<CAPTION>
  EXHIBIT NO.                      DESCRIPTION OF EXHIBIT
  -----------                      ----------------------
<S>              <C>
      5.1        Opinion of Gray Cary Ware & Freidenrich LLP.

     10.1*       Acquisition Agreement between SciClone and Sclavo S.p.A., dated
                 April 20, 1998.

     10.2*       First Amendment to Acquisition Agreement between SciClone and
                 Sclavo S.p.A., dated April 20, 1998.

     10.3        Second Amendment to Acquisition Agreement by and among
                 SciClone, Sclavo S.p.A. and Solar Developments and Partners,
                 dated November 6, 1998.

     10.4        Amendment to Warrant by and among SciClone, Sclavo S.p.A. and
                 Solar Developments and Partners dated April 20, 1998.

     10.5*       Stock Purchase Warrant dated September 3, 1998

     23.1        Consent of Ernst & Young LLP, independent auditors.

     23.2        Consent of Gray Cary Ware & Freidenrich LLP (included in
                 Exhibit 5.1).

     24.1        Power of Attorney (included in the Signature Page contained in
                 Part II of the Registration Statement).
</TABLE>


- -------------------

*  Filed as an exhibit to the Company's Report on Form 10-Q for the period ended
   September 30, 1998.





<PAGE>   1

                                                                     EXHIBIT 5.1



GRAY CARY WARE & FREIDENRICH LLP

139 Townsend Street, Suite 400, P.O. Box 77630, San Francisco, CA 94107-1922
Phone 415-836-2500    Fax 415-836-9220    www.gcwf.com



April 30, 1999



Securities and Exchange Commission
450 Fifth Street, N.W
Washington, D.C.  20549

RE:  SCICLONE PHARMACEUTICALS, INC.
     REGISTRATION STATEMENT ON FORM S-3

Ladies and Gentlemen:

As legal counsel for SciClone Pharmaceuticals, Inc., a California corporation
(the "Company"), we are rendering this opinion in connection with the
preparation and filing of a registration statement on Form S-3 (the
"Registration Statement") relating to the registration under the Securities Act
of 1933, as amended, of 750,000 shares (the "Registered Shares") of Common
Stock, no par value (the "Common Stock"), issued or issuable by the Company in
connection with the acquisition (the "Acquisition") of certain rights related to
ZADAXIN(R) thymosin alpha 1.

We have examined such instruments, documents and records as we deemed relevant
and necessary for the basis of our opinion hereinafter expressed. In such
examination, we have assumed the genuineness of all signatures and the
authenticity of all documents submitted to us as originals and the conformity to
the originals of all documents submitted to us as copies.

Based on such examination, we are of the opinion that the 375,000 Registered
Shares of Common Stock of the Company issued to the purchaser are, and the
375,000 Registered Shares of Common Stock of the Company issuable to the
purchaser upon exercise of a warrant, when issued to the purchaser in accordance
with the terms of the Acquisition, will be, duly authorized shares, validly
issued, fully paid, and nonassessable.

We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement referred to above and the use of our name wherever it
appears in said Registration Statement.

This opinion is to be used only in connection with the issuance of the Common
Stock while the Registration Statement is in effect.

Respectfully submitted,


/s/ Gray Cary Ware & Freidenrich LLP

GRAY CARY WARE & FREIDENRICH LLP


SILICON VALLEY           SAN DIEGO           SAN FRANCISCO            AUSTIN
          LA JOLLA            IMPERIAL VALLEY                  MEXICO

<PAGE>   1
                                                                    EXHIBIT 10.3



                    SECOND AMENDMENT TO ACQUISITION AGREEMENT

        This SECOND AMENDMENT TO ACQUISITION AGREEMENT ("Second Amendment") is
dated as of November 6, 1998 (the "Effective Date"), by and among SciClone
Pharmaceuticals, Inc., a California corporation, ("SciClone"), Sclavo S.p.A., an
Italian company ("Sclavo") and Solar Developments and Partners ("Solar"), as
designee of Sclavo. SciClone, Sclavo and Solar are hereinafter referred to
individually as a "Party" or collectively as the "Parties." Capitalized terms
used and not defined herein shall have the meanings assigned to such terms in
that certain Acquisition Agreement between SciClone and Sclavo, dated as of
April 20, 1998 (the "Acquisition Agreement"), as amended by that certain First
Amendment to Acquisition Agreement, dated as of April 20, 1998 (the "First
Amendment," and together with the Acquisition Agreement, the "Agreement").

                                    RECITALS

        WHEREAS, pursuant to the Agreement, SciClone acquired certain rights to
thymosin alpha 1 ("TA-1") in the Territory and agreed to issue certain shares of
its Common Stock and a warrant (the "Warrant") to Sclavo or its designee;

        WHEREAS, pursuant to the Agreement, Sclavo designated Solar as recipient
of the shares of SciClone common stock and Warrant; and

        WHEREAS, the Parties desire to amend certain provisions of the Agreement
relating to, among other things, resale of the shares of SciClone common stock
originally issued to Solar and the term of the Warrant, as set forth below.

        NOW, THEREFORE, in consideration of the foregoing premises and other
good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the Parties agree as follows:


                                    ARTICLE I

                                    AGREEMENT

        1.1    Section 5.4 of the Acquisition Agreement is hereby amended and
restated in its entirety to read as follows:

               "5.4   Sclavo and Solar agree that Solar will not sell any of the
        original number of Shares issued to Solar prior to May 5, 1999. Sclavo
        and Solar agree that the resale of the Shares shall be made exclusively
        through such reputable broker(s) each of which must be pre-approved in
        writing by SciClone, which approval will not be withheld or delayed
        unreasonably."

        1.2    Section 3 of the First Amendment is hereby amended and restated
in its entirety to read as follows:



                                       -1-
<PAGE>   2

               "3.    Stock Warrant. In consideration for this Amendment,
        SciClone shall also grant to Sclavo at the Closing a Stock Warrant, in
        customary form, entitling Sclavo to purchase up to 375,000 shares of
        SciClone's Common Stock at an exercise purchase price of US $4.125 per
        share, which Stock Warrant shall remain available for exercise until
        June 29, 2003."

        1.3    Except as amended hereby, the Agreement shall remain unchanged
and in full force and effect.

                                   ARTICLE II

                                  MISCELLANEOUS


        2.1    Governing Law. This Second Amendment shall be governed by and
construed in accordance with the laws of the State of California as such laws
are applied to agreements between California residents entered into and to be
performed entirely within California.

        2.2    Counterparts. This Second Amendment may be executed in
counterparts, each of which shall be deemed an original, but all of which shall
constitute one and the same instrument. Signatures may be transmitted by
facsimile, and once the Parties have transmitted their signatures, this Second
Amendment shall be binding and effective.



                  [REST OF THIS PAGE INTENTIONALLY LEFT BLANK]



<PAGE>   3



        IN WITNESS WHEREOF, the Parties by their authorized representatives have
executed this Second Amendment as of the date and year first above written.


                                       SCLAVO S.p.A.


                                       By: /s/ Paolo Marcucci
                                           ------------------------------------

                                       Printed: _______________________________

                                       Title: _________________________________



                                       SOLAR DEVELOPMENTS AND PARTNERS


                                       By: /s/ Jason Anthony Tabone
                                           ------------------------------------

                                       Printed: _______________________________

                                       Title: _________________________________



                                       SCICLONE PHARMACEUTICALS, INC.


                                       By: /s/ Donald R. Sellers   
                                           ------------------------------------

                                       Printed: _______________________________

                                       Title: _________________________________



          [SIGNATURE PAGE TO SECOND AMENDMENT TO ACQUISITION AGREEMENT]


<PAGE>   1
                                                                    EXHIBIT 10.4



                              AMENDMENT TO WARRANT

        This AMENDMENT TO WARRANT ("Amendment") is dated as of November 6, 1998
(the "Effective Date"), by and among SciClone Pharmaceuticals, Inc., a
California corporation, ("SciClone"), Sclavo S.p.A., an Italian company
("Sclavo") and Solar Developments and Partners, as designee of Sclavo ("Solar").
SciClone, Sclavo and Solar are hereinafter referred to individually as a "Party"
or collectively as the "Parties." Capitalized terms used and not defined herein
shall have the meanings assigned to such terms in that certain Acquisition
Agreement between SciClone and Sclavo, dated as of April 20, 1998, as amended to
date (the "Agreement").

                                    RECITALS

        WHEREAS, pursuant to the Agreement, SciClone acquired certain rights to
thymosin alpha 1 ("TA-1") in the Territory and agreed to issue certain shares of
its Common Stock and a warrant (the "Warrant") to Sclavo or its designee;

        WHEREAS, pursuant to the Agreement, Sclavo designated Solar as recipient
of the shares of SciClone common stock and Warrant; and

        WHEREAS, the Parties desire to amend certain provisions of the Warrant
relating to, among other things, the term of the Warrant, as set forth below.

        NOW, THEREFORE, in consideration of the foregoing premises and other
good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the Parties agree as follows:

                                    ARTICLE I

                                    AGREEMENT

        1.1    The first unnumbered paragraph of the Warrant is hereby restated
in its entirety to read as follows:

               "THIS CERTIFIES that, for value received, Sclavo S.p.A. (the
        "Holder"), is entitled, upon the terms and subject to the conditions
        hereinafter set forth, at any time on or after one day after the date
        hereof and on or prior to June 29, 2003 (the "Termination Date") but not
        thereafter, to subscribe for and purchase from SCICLONE PHARMACEUTICALS,
        INC., a California corporation (the "Company"), three hundred
        seventy-five thousand (375,000) shares of Common Stock (the "Warrant
        Shares"). The purchase price of one share of Common Stock (the "Exercise
        Price") under this Warrant shall be Four Dollars and Twelve and One-Half
        Cents (US $4.125). The Exercise Price and the number of shares for which
        the Warrant is exercisable shall be subject to adjustment as provided
        herein."



                                       -1-
<PAGE>   2


        1.2    Except as amended hereby, the Warrant shall remain unchanged and
in full force and effect.

                                   ARTICLE II

                                  MISCELLANEOUS

        2.1    Governing Law. This Amendment shall be governed by and construed
in accordance with the laws of the State of California as such laws are applied
to agreements between California residents entered into and to be performed
entirely within California.

        2.2    Counterparts. This Amendment may be executed in counterparts,
each of which shall be deemed an original, but all of which shall constitute one
and the same instrument. Signatures may be transmitted by facsimile, and once
the Parties have transmitted their signatures, this Amendment shall be binding
and effective.



                  [REST OF THIS PAGE INTENTIONALLY LEFT BLANK]









                                      -2-
<PAGE>   3



        IN WITNESS WHEREOF, the Parties by their authorized representatives have
executed this Amendment as of the date and year first above written.


                                       SCLAVO S.p.A.


                                       By: /s/ Paolo Marcucci 
                                           ------------------------------------

                                       Printed: _______________________________

                                       Title: _________________________________



                                       SOLAR DEVELOPMENTS AND PARTNERS


                                       By: /s/ Jason Anthony Tabone 
                                           ------------------------------------

                                       Printed: _______________________________

                                       Title: _________________________________



                                       SCICLONE PHARMACEUTICALS, INC.


                                       By: /s/ Donald R. Sellers   
                                           ------------------------------------

                                       Printed: _______________________________

                                       Title: _________________________________



                    [SIGNATURE PAGE TO AMENDMENT TO WARRANT]


<PAGE>   1

                                                                    EXHIBIT 23.1


               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

        We consent to the reference to our firm under the caption "Experts" in 
the Registration Statement on Form S-3 and the related Prospectus of SciClone 
Pharmaceuticals, Inc. for registration of 750,000 shares of its Common Stock 
and to the incorporation by reference therein of our report dated March 17, 
1999, with respect to the consolidated financial statements and schedule of 
SciClone Pharmaceuticals, Inc. included in its Annual Report on Form 10-K for 
the year ended December 31, 1998 filed with the Securities and Exchange 
Commission.



/s/ Ernst & Young LLP

Palo Alto, California
April 29, 1999


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