APHTON CORP
S-3/A, 1998-07-06
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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      As Filed with the Securities and Exchange Commission on July 2, 1998
                                                              File No. 333-36925

================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                             ---------------------
                                 AMENDMENT NO. 2
                                       TO
                                    FORM S-3
                             REGISTRATION STATEMENT
                        UNDER THE SECURITIES ACT OF 1933
                             ----------------------
                               APHTON CORPORATION
             (Exact name of registrant as specified in its charter)
<TABLE>
<CAPTION>
<S>                                                <C>                                       <C>          
     DELAWARE                                                                                      95-3640931
(State or other jurisdiction                           444 Brickell Avenue                      (I.R.S. Employer
of incorporation or organization)                         Suite 51-507                       Identification Number)
                                                   Miami, Florida  33131-2492
                                                         (305) 374-7338
</TABLE>

               (Address, including zip code, and telephone number,
        including area code, of registrant's principal executive offices)
                          ---------------------------
                                 PHILIP C. GEVAS
                      President and Chief Executive Officer
                               APHTON CORPORATION
                               444 Brickell Avenue
                                  Suite 51-507
                            Miami, Florida 33131-2492
                                 (305) 374-7338
           (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)

                                   Copies to:
                            TIMOTHY B. GOODELL, ESQ.
                                WHITE & CASE LLP
                           1155 AVENUE OF THE AMERICAS
                            NEW YORK, NEW YORK 10036
                          ---------------------------
        APPROXIMATE  DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:  From
time to time after this Registration Statement becomes effective.

        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. [ ]

<TABLE>
<CAPTION>


                         CALCULATION OF REGISTRATION FEE
- ------------------------------------------------------------------------------------------------------------------------------------
         TITLE OF SECURITIES               AMOUNT TO      PROPOSED MAXIMUM AGGREGATE        PROPOSED MAXIMUM            AMOUNT OF
          TO BE REGISTERED               BE REGISTERED        PRICE PER SHARE(1)           AGGREGATE OFFERING       REGISTRATION FEE
                                                                                               PRICE)(2)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                         <C>                    <C>                         <C>                       <C>      

Common Stock, $.001 par value               715,000                13.56(2)                    $9,697,188                $2,939
- ------------------------------------------------------------------------------------------------------------------------------------
Common Stock, $.001 par value,
issuable upon exercise of the Warrant       225,000                $17.50(3)                   $3,937,500                $1,193
====================================================================================================================================
   Total                                    940,000                                                                      $4,132
====================================================================================================================================

</TABLE>

(1)  Estimated  solely for the purpose of calculating  the  Registration  Fee in
     accordance with Rule 457 of the Securities Act of 1933.
(2)  Based on average of the high and low prices of the Common Stock reported on
     NASDAQ National Market System on September  30, 1997.  
(3)  Based on the exercise  price of the Warrants  pursuant to which such shares
     may be issued. 

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

     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 said Section 8(a),
may determine.
================================================================================


<PAGE>

                   SUBJECT TO COMPLETION, DATED JULY __, 1998

                940,000 SHARES OF COMMON STOCK, $.001 PAR VALUE

                               APHTON CORPORATION

     This  Prospectus  relates  to offers and  sales,  if any,  of up to 715,000
shares (the  "Resale  Shares")  of common  stock,  $.001 par value (the  "Common
Stock"), of Aphton Corporation (the "Company" or "Aphton"), which may be offered
or sold from time to time by the selling  stockholder named herein (the "Selling
Stockholder").  This Prospectus also relates to the issuance after June 16, 1998
of up to 225,000 shares of Common Stock (the "Warrant  Shares" and together with
the Resale  Shares,  the "Shares")  upon exercise by the Selling  Stockholder of
that certain Warrant, dated June 16, 1997, of the Company (the "Warrant") issued
to the Selling Stockholder. The Company issued the Resale Shares and the Warrant
to the  Selling  Stockholder  through a  private  placement  of such  securities
completed on June 16, 1997.

     The  Company  will  receive no part of the  proceeds of any sales of Resale
Shares by the selling Stockholder,  but will receive the exercise price for each
Warrant Share issued pursuant to any exercise of the Warrant. The exercise price
is $17.50 per share,  subject to adjustment in accordance  with the terms of the
Warrant,  and the maximum  aggregate  exercise  price is $3,937,500  (subject to
adjustment).  The Company has agreed to pay the costs and  expenses  incurred in
connection with the registration of the Shares, but the Selling Stockholder will
be responsible for all selling  commissions,  transfer taxes and related charges
in  connection  with  offers and sales,  if any,  by it of Shares.  See "Plan of
Distribution."

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

         THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
           SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
            COMMISSION NOR HAS THE COMMISSION OR ANY STATE SECURITIES
             COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
                PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS
                               A CRIMINAL OFFENSE.
                               ------------------

           SEE "RISK FACTORS" COMMENCING ON page 8 FOR A DISCUSSION OF
          CERTAIN FACTORS THAT SHOULD BE CONSIDERED IN CONNECTION WITH
                       AN INVESTMENT IN THE COMMON STOCK.

     The  Selling  Stockholder  may  sell  all or a  portion  of the  Shares  in
transactions  (which may involve one or more block transactions) on the National
Association of Securities  Dealers Inc.  Automated  Quotation System  ("NASDAQ")
National Market System,  in negotiated  transactions or in the  over-the-counter
market at then-prevailing  market prices, at prices related to such prices or at
negotiated  prices.  The  Selling  Stockholder  may  effect  some or all of such
transactions  by  selling  to or through  one or more  broker-dealers,  and such
broker-dealers may receive compensation in the form of discounts, concessions or
commissions  from the  Selling  Stockholder.  The  Selling  Stockholder  and any
broker-dealers   that   participate  in  the   distribution  may  under  certain
circumstances  be  deemed  to  be  "underwriters"  within  the  meaning  of  the
Securities Act of 1933, as amended (the  "Securities  Act"),  and any discounts,
concessions  or  commissions  received  by such  broker-dealers  and any profits
realized on the resale of Resale Shares by them may be deemed to be underwriting
discounts and  commissions  under the Securities  Act. The Company has agreed to
indemnify  the  Selling  Stockholder  against  certain  liabilities,  including,
without limitation,  certain liabilities under the Securities Act. To the extent
required, the specified Resale Shares to be sold, the public offering price, the
names of any such broker-dealers, and any applicable commission or discount with
respect to any  particular  offer will be set forth in a prospectus  supplement.
See "Plan of Distribution."

     The Common  Stock of the  Company is traded on the NASDAQ  National  Market
System under  the symbol "APHT".  On July 1, 1998, the last reported sales price
of the Company's  Common Stock on the NASDAQ  National  Market System was $16.50
per share.

                                                                                
                 The date of this Prospectus is July __, 1998.


Information   contained  herein  is  subject  to  completion  or  amendment.   A
registration  statement  relating  to these  securities  has been filed with the
Securities  and Exchange  Commission.  These  securities may not be sold nor may
offers to buy be accepted prior to the time the Registration  Statement  becomes
effective.  This  prospectus  shall  not  constitute  an  offer  to  sell or the
solicitation of an offer to buy nor shall there be any sale of these  securities
in any State in which such offer,  solicitation  or sale would be unlawful prior
to registration or qualification under the securities laws of any such State.


<PAGE>

         NO DEALER,  SALESMAN OR OTHER  PERSON HAS BEEN  AUTHORIZED  TO GIVE ANY
INFORMATION OR TO MAKE ANY  REPRESENTATION NOT CONTAINED IN THIS PROSPECTUS AND,
IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATION  MUST NOT BE RELIED UPON AS
HAVING BEEN  AUTHORIZED BY APHTON.  NEITHER THE DELIVERY OF THIS  PROSPECTUS NOR
ANY SALE MADE HEREUNDER SHALL, UNDER ANY  CIRCUMSTANCES,  CREATE ANY IMPLICATION
THAT THERE HAS BEEN NO CHANGE IN THE  AFFAIRS OF APHTON  SINCE THE DATE  HEREOF.
THIS  PROSPECTUS  DOES NOT CONSTITUTE AN OFFER TO SELL OR A  SOLICITATION  OF AN
OFFER TO BUY THE SECURITIES  OFFERED HEREBY IN ANY JURISDICTION TO ANY PERSON TO
WHOM IT IS UNLAWFUL TO MAKE SUCH OFFER IN SUCH JURISDICTION.


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


                             AVAILABLE INFORMATION

         The  Company  is  subject  to  the  informational  requirements  of the
Securities  Exchange  Act of 1934,  as amended  (the  "Exchange  Act"),  and, in
accordance therewith,  files reports, proxy and information statements and other
information with the Securities and Exchange Commission (the "Commission"). Such
reports,  proxy and information  statements and other  information  filed by the
Company  can  be  inspected  and  copied  at  the  public  reference  facilities
maintained by the Commission at 450 Fifth Street,  N.W., Room 1204,  Washington,
D.C. 20549, and at the following  Regional  Offices of the Commission:  New York
Regional Office, 7 World Trade Center, 13th Floor, New York, New York 10048, and
Chicago Regional Office,  Citicorp Center, 500 West Madison Street,  Suite 1400,
Chicago,  Illinois 60661-2511.  Copies of such material may be obtained from the
Public Reference Section of the Commission at Judiciary Plaza, 450 Fifth Street,
N.W.,  Washington,  D.C. 20549, at prescribed rates. In addition, the Commission
maintains a web site on the internet at  http://www.sec.gov,  that  contains the
Company's  reports,  proxy statements and other  information.  Such material can
also be inspected at the offices of the Nasdaq National  Market,  1735 K Street,
N.W., Washington, D.C. 20006.

         The Company has filed with the Commission a  Registration  Statement on
Form S-3 (the  "Registration  Statement"),  with respect to the Shares, of which
this  Prospectus  forms  a  part.  This  Prospectus  does  not  contain  all the
information  set  forth  in the  Registration  Statement  and the  exhibits  and
schedules  thereto,  certain parts of which are omitted in  accordance  with the
rules and regulations of the Commission. Statements contained in this Prospectus
as to the  contents  of any  contract  or  other  document  are not  necessarily
complete and in each instance  reference is made to the copy of such contract or
other  document filed as an exhibit to the  Registration  Statement or otherwise
filed with the  Commission.  Each such statement is qualified in its entirety by
such reference.  For further  information  regarding the Company and the Shares,
reference is made to such Registration  Statement and the exhibits and schedules
thereto.  The Registration  Statement and the exhibits and schedules thereto may
be inspected without charge at the office of the Commission at 450 Fifth Street,
N.W., Room 1204,  Washington,  D.C.  20549,  and copies may be obtained from the
Commission at prescribed rates.


<PAGE>


                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

         The following  documents  filed by the Company with the  Commission are
incorporated herein by reference and made a part hereof, except as superseded or
modified herein: the Company's  Transition Report on Form 10-K filed May 1, 1998
and the Company's Quarterly Report on Form 10-Q for the three months ended April
30, 1998.

         All  documents  filed by the Company  with the  Commission  pursuant to
Section  13(a),  13(c),  14 or 15(d) of the  Exchange Act after the date of this
Prospectus and prior to the termination of the offering of the Shares covered by
this  Prospectus  shall be  deemed to be  incorporated  by  reference  into this
Prospectus  and to be a part hereof  from the date of filing of such  documents.
Any  statement   contained  in  any  document   incorporated  or  deemed  to  be
incorporated by reference in this  Prospectus  shall be deemed to be modified or
superseded  for  purposes  of this  Prospectus  to the extent  that a  statement
contained herein or in any other subsequently filed document which also is or is
deemed to be incorporated by reference in this Prospectus modifies or supersedes
such  statement.  Any such  statement  so  modified or  superseded  shall not be
deemed,  except  as  modified  or  superseded,  to  constitute  a part  of  this
Prospectus.

         THE COMPANY WILL PROVIDE  WITHOUT CHARGE TO EACH PERSON,  INCLUDING ANY
BENEFICIAL  OWNER,  TO WHOM THIS  PROSPECTUS IS DELIVERED,  UPON WRITTEN OR ORAL
REQUEST OF SUCH PERSON, A COPY OF ANY AND ALL OF THE DOCUMENTS THAT HAVE BEEN OR
MAY BE INCORPORATED BY REFERENCE IN THIS PROSPECTUS (OTHER THAN EXHIBITS TO SUCH
DOCUMENTS  WHICH  ARE NOT  SPECIFICALLY  INCORPORATED  BY  REFERENCE  INTO  SUCH
DOCUMENTS). SUCH REQUESTS SHOULD BE DIRECTED TO THE COMPANY: APHTON CORPORATION,
444 BRICKELL AVENUE, SUITE 51-507, MIAMI, FLORIDA 33131-2492  (TELEPHONE:  (305)
374-7338).

PROJECTIONS AND FORWARD-LOOKING STATEMENTS

         Certain  statements  in  this  Prospectus  constitute  "forward-looking
statements"  within the  meaning of the  Securities  Act.  Such  forward-looking
statements  are  subject  to risks and  uncertainties  that could  cause  actual
results to differ materially from those stated in the Prospectus. Such risks and
uncertainties  include,  among others,  those  described under the heading "Risk
Factors."   Forward-looking   statements   are  made  based  upon   management's
expectations,  assumptions, judgments and beliefs concerning future developments
and  global  economic,  industry  and  financial  market  conditions,  and their
potential effect upon the Company.

<PAGE>

                                  THE COMPANY

         Aphton Corporation is a  biopharmaceutical  company developing products
using its  innovative  vaccine-like  technology for  neutralizing  hormones that
participate  in  gastrointestinal  system  and  reproductive  system  cancer and
non-cancer  diseases and the  prevention of pregnancy.  These  products,  called
immunogens,  treat the following diseases:  (a) Gastroesophageal  Reflux Disease
(GERD,  or  severe  heartburn),  ulcers  and  colorectal,   stomach,  liver  and
pancreatic  cancers;  (b)  endometriosis and prostate,  breast,  endometrial and
ovarian cancers.

         Aphton's  approach  to the  treatment  of major  diseases  is to employ
(anti) "hormone  therapy."  Aphton's hormone therapy involves  neutralizing,  or
blocking,   hormones   which  play  a   critical   role  in   diseases   of  the
gastrointestinal and reproduction  systems.  Aphton has selected the strategy of
hormone therapy because it has proved, over many years, to be efficacious in the
treatment of major diseases, both malignant and non-malignant; in short, because
this   risk-averse   strategy  has  been  proven  to  be  effective  in  humans.
Well-documented  examples  of such  efficacy  in humans  are:  blocking  gastrin
(Proglumide)  and histamine  (Zantac,  Tagamet),  which in turn is stimulated by
gastrin,  in order to reduce stomach acid to treat  ulcerations of the esophagus
and to heal or prevent peptic ulcers;  blocking estrogen  (Tamoxifen) for breast
cancer therapy and blocking testosterone for prostate cancer therapy.

         Aphton has completed both safety and  dose-ranging  phases of its Phase
I/II clinical  trials with its  immunotherapeutic  product,  Gastrimmune(TM)  in
terminal  cancer  patients.  Aphton has  demonstrated,  during the  dose-ranging
phase, that  Gastrimmune(TM)  induces large antibody responses in terminally ill
patients  whose colon cancer had not only  metastasized  to the liver,  but were
considered  "end stage".  Aphton plans to conduct  clinical trials and apply for
approval for all of the above gastrointestinal system cancers and stomach cancer
has been selected as the first indication for which regulatory  approval will be
sought. There is no current effective therapy for stomach cancer.

         In 1997 Aphton  signed an  agreement  with  Pasteur  Merieux  Connaught
("PMC")  (Rhone-Poulenc  Group),  for a strategic  alliance for all human cancer
applications of Gastrimmune(TM) including stomach, colorectal, liver, esophageal
and pancreatic cancers. Under the terms of the twenty-year agreement,  Aphton is
responsible  for product  development,  clinical  trials and  regulatory  agency
approvals, and PMC is responsible for and will fund the promotion,  advertising,
marketing,  distribution and sales of Gastrimmune(TM)  in North America,  Mexico
and Europe. In addition, Aphton and PMC have entered and will enter into further
agreements  providing for the supply of Gastrimmune(TM) to PMC and the supply of
certain  components  of  Gastrimmune(TM)  and other Aphton  products from PMC to
Aphton.  Discussions are continuing  between PMC and Aphton for marketing rights
to Gastrimmune(TM) in Japan and other Asian markets.

         In August 1997, Aphton announced that it formed an exclusive  worldwide
strategic  alliance  with  Schering-Plough  Animal  Health for the  development,
clinical   testing,   manufacturing   and  marketing  of  Aphton's   proprietary
anti-gastrin  17 immunogen,  a veterinary  product,  that reduces  stomach acid.
Equine  ulcers was  selected as the first  indication  to be pursued.  Under the
terms of the  agreement,  Schering-Plough  Animal  Health will work closely with
Aphton's  scientists  and management to bring the  anti-gastrin  17 immunogen to
market.  Schering-Plough  is  responsible  for all capital  costs and  financial
requirements, product development, clinical trials and marketing for each animal
health  indication.  Schering-Plough  Animal Health and Aphton will share in all
product profits.

         In November,  1997,  Aphton  announced that it was issued a U.S. patent
relating  to  Aphton's   anti-Gonadotropin   Releasing  Hormone  (GnRH)  product
Gonadimmune(TM),  for the  therapeutic  treatment  of  prostate  cancer,  breast
cancer, endometrial cancer and endometriosis.  Gonadimmune(TM) has completed the
toxicology testing (safety) required for human use, having previously  completed
extensive and  successful  preclinical  animal  testing  (safety and  efficacy).
Aphton  plans to initiate a Phase I/II  clinical  trial for both breast  cancer,
prostate cancer and also patients with other diseases.

         Aphton has exclusive  manufacturing,  distribution and sales rights for
an immunocontraceptive  product, also utilizing vaccine-like technology.  Aphton
is  collaborating  with the  World  Health  Organization  (WHO) on the  clinical
development of the product. This product will be sold, when approved,  worldwide
in both the developed and the  developing  countries and will confer  protective
immunity and prevent pregnancy.

         Aphton's strengths include its innovative technology and products which
specifically  neutralize,  or  block,  hormones  in a  novel  manner,  providing
significant benefits and advantages over conventional drugs (blockers),  some of
which have severe  disadvantages.  Aphton's  products,  of course,  must proceed
successfully  through the  clinical  trials and  regulatory  process in the same
manner as many newly  discovered drugs whose mode of action,  in contrast,  have
not been demonstrated  previously to be clinically effective in humans. However,
Aphton believes that employing a strategy of therapeutic  approach that has been
proven  effective  in  humans  significantly   reduces  risk  and  enhances  the
likelihood of: clinical trials success;  obtaining  regulatory  agency approval;
achieving  commercial success in the market place; and, benefiting large numbers
of patients suffering from these serious diseases.

         In view of the  foregoing,  Aphton  believes  that its crucial task, in
addition  to  proper  planning  and  execution  during  clinical  trials,  is to
demonstrate  in human  trials that each  product  induces the  patient's  immune
system to  neutralize,  or block,  its targeted  hormone.  Aphton  believes that
therapeutic efficacy should then follow and be demonstrated in the pivotal Phase
III trials,  given the history of success and  efficacy  for hormone  therapy in
humans, in which the targeted hormone is blocked.

         On  January  29,  1998,   the  Company's   predecessor,   a  California
corporation   ("Aphton   California"),    completed   a   reincorporation   (the
"Reincorporation")  in Delaware through the merger of Aphton California with and
into the Company which was Aphton California's wholly-owned Delaware subsidiary,
with the Company being the surviving  corporation.  As of the effective  date of
such merger,  Aphton  California ceased to exist. The  Reincorporation  effected
only a  change  in  domicile.  It did not  result  in any  change  of the  name,
business, management,  employees, assets or liabilities or trading symbol of the
Company.  Pursuant to the Agreement  and Plan of Merger  between the Company and
Aphton  California,  dated as of January 29,  1998,  each  outstanding  share of
Aphton California's common stock, no par value, was automatically converted into
one share of Common Stock, par value $.001 per share, of the Company. Each stock
certificate  representing  issued and outstanding shares of Aphton  California's
common stock represents the same number of shares of the Company's Common Stock.
In  addition,  each  outstanding  option  or right to  acquire  shares of Aphton
California's  common stock was  converted  into an option or right to acquire an
equal number of shares of the Company's  Common Stock,  under the same terms and
conditions as the original options or rights.

         In June 1998,  Aphton signed an agreement with  SmithKline  Beecham plc
("SmithKline  Beecham")  to form a  worldwide  strategic  alliance  relating  to
Aphton's  Gonadimmune(TM).  The agreement  provides that SmithKline Beecham will
receive  exclusive  rights worldwide to Aphton's related patents and proprietary
technology and will fund all costs of product  development,  clinical trials and
approvals  for  worldwide  marketing  and  distribution.  Aphton and  SmithKline
Beecham  will  collaborate  in a  development  program  with  the  objective  of
developing  products  related to the  diagnosis,  treatment  and  prevention  of
GnRH-related  cancers and other  diseases.  Clinical  trials  will be  conducted
jointly by Aphton and SmithKline  Beecham.  Prostate cancer has been selected as
the subject for the first human clinical study.

                                  RISK FACTORS

         In addition to the other information contained in this Prospectus,  the
following risk factors should be carefully considered.


         EARLY  STAGE OF PRODUCT  DEVELOPMENT.  All of the  Company's  potential
products are in research and  development,  and no revenues have been  generated
from product sales. The Company's most advanced potential product,  an immunogen
for the treatment of colorectal cancer, has completed the dose-ranging  clinical
trial phase in the United Kingdom,  and results obtained in preclinical  studies
are not necessarily  indicative of results that will be obtained in the clinical
trial.  The Company's  other current  potential  products,  for the treatment of
stomach cancer,  pancreatic cancer, GERD, chronic peptic ulcers,  breast cancer,
endometriosis  and  prostate  cancer  are at the same  (stomach  and  pancreatic
cancer) or even earlier phases of  development.  All of the Company's  potential
products  will  require  significant  additional  research and  development  and
expensive,  extensive,  time consuming clinical testing prior to commercial use.
Accordingly,  the Company does not expect to derive revenues from these products
for a number of years, if at all. There can be no assurance that these potential
products will be successfully developed into immunogens that can be administered
to humans or that any such  immunogen  will prove safe and effective in clinical
trials or cost-effective to manufacture and administer.  In addition,  there can
be no assurance that the Company will not encounter  problems in clinical trials
that will cause the Company to delay or suspend a clinical  trial,  that such of
the Company's  products as are  currently  under  development  will be completed
successfully within any specified time period, if at all, that such testing will
show such products to be safe or effective or that any of the Company's products
will receive  required  regulatory  approval.  Further,  if any of the Company's
products do receive  regulatory  approval,  there can be no  assurance  that the
Company will be capable of producing  such products in commercial  quantities at
reasonable costs or that such products will be accepted by the marketplace.

         ABSENCE  OF  PROFITABLE  OPERATIONS;  NO  DIVIDENDS.  The  Company  has
experienced significant operating losses since its inception in 1981 and expects
to continue to incur substantial  operating losses for at least the next several
years.  Losses are expected to increase as a result of the  expenses  associated
with clinical testing and research and development.  As of January 31, 1998, the
Company had an accumulated  deficit of approximately $32 million.  The Company's
ability to achieve  profitability  depends  upon its  ability,  alone or through
relationships  with third parties,  to  successfully  develop its technology and
products, to obtain required regulatory approvals and to manufacture, market and
sell such  products.  There can be no assurance  that the Company will ever have
profitable operations or that profitability, if achieved, can be sustained on an
ongoing basis.

         The  Company  has never paid any  dividends  and does not expect to pay
cash dividends in the foreseeable future.

         CAPITAL  REQUIREMENTS;   UNCERTAINTY  OF  ADDITIONAL   FINANCING.   The
development  of the Company's  technology and products will require a commitment
of  substantial  funds to conduct  the costly and  time-consuming  research  and
clinical trials  necessary for such  development.  The Company's  future capital
requirements  will depend on many other factors including  continued  scientific
progress in the  research and  development  (clinical  trials) of the  Company's
products,  the  ability  of the  Company  to  collaborate  with  others  for the
manufacture,  marketing  and  sale  of its  products,  the  cost  of  regulatory
approvals,  the cost of  establishing,  maintaining  and enforcing  intellectual
property rights,  competing technological and market developments and changes in
Aphton's existing research relationships.  The Company's net rate of expenditure
during  the two year  period  ended  January  31,  1998  averaged  approximately
$600,000 per month. The rate of expenditure, however, is anticipated to increase
substantially as the Company proceeds through, its Phase III clinical trials for
its Gastrimmune(TM)  products.  Such rate of expenditure may increase further if
the  Company  pursues  preclinical  studies  or  clinical  trials  for its other
products at a faster rate than currently anticipated.  The Company believes that
its current  capital  resources,  which are composed  primarily of cash and cash
equivalents, should be sufficient, barring unforeseen circumstances, to fund its
operating  expenses and capital  requirements as currently planned into the year
2000.

         The  Company  may  seek  additional  financing  through   collaborative
arrangements or through public or private equity or debt  financings.  There can
be no assurance that additional  financing will be available on acceptable terms
or at all. If additional funds are raised by issuing equity securities, dilution
to the  interests  of  shareholders  may  result.  If  adequate  funds  are  not
available,  the  Company  may be  required  to  delay,  reduce  the  scope of or
eliminate one or more of its research or development programs or to obtain funds
through arrangements with collaborative  partners or others that may require the
Company to relinquish rights to certain of its technologies,  potential products
or products that the Company would  otherwise  seek to develop or  commercialize
itself.

         DIFFERENT APPROACH TO DISEASE TREATMENT; NO PROOF OF EFFICACY OR MARKET
ACCEPTANCE.  The Company believes that its products under  development are based
on an approach to disease therapy and prevention  which  previously has not been
utilized successfully by any pharmaceutical or biotechnology  company. There can
be  no  assurance  that  the  Company's  product  development  efforts  will  be
successfully  completed,  that the Company's  products will be proven to be safe
and effective, that approval by the U.S. Food and Drug Administration ("FDA") or
any other applicable regulatory agency will be obtained or that medical centers,
hospitals,  physicians or patients will accept the Company's products as readily
as  current  drug  therapies  or  other  forms  of  treatment.  Undesirable  and
unintended side effects or unfavorable publicity concerning any of the Company's
products  or other  products  incorporating  a similar  approach  could limit or
curtail  commercial  use of the  Company's  products  and could  have an adverse
effect on the Company's  ability to obtain  regulatory  approvals and to achieve
physician and patient acceptance.

         GOVERNMENT REGULATION AND PRODUCT APPROVALS. The research,  preclinical
development,  clinical trials,  manufacturing and marketing of Aphton's products
are subject to extensive regulation by numerous governmental  authorities in the
United  States  and other  countries.  Clinical  trials  and  manufacturing  and
marketing of products will be subject to rigorous testing and approval processes
by  the  FDA  and  equivalent  foreign  regulatory  authorities,  including  the
Medicines Control Agency ("MCA") in the United Kingdom. The process of obtaining
FDA and other required regulatory  approvals is lengthy and expensive.  The time
required for FDA approval is uncertain,  and typically  takes a number of years,
depending on the type,  complexity and novelty of the product.  Since certain of
the Company's  planned  products involve the application of new technologies and
are based on a new therapeutic  approach,  regulatory  approvals may be obtained
more slowly than for products  produced  using more  conventional  technologies.
Additionally,  delays or disapprovals  may be encountered  based upon additional
government regulation resulting from future legislation or administrative action
or changes in FDA or equivalent foreign regulatory policy made during the period
of product development and regulatory review.

         The  Company  plans to apply  for MCA  approval  to  commercialize  its
potential  immunogen  for the  treatment of one or more of the  gastrointestinal
system  cancers and  ulcerations  previously  described  prior to  applying  for
similar FDA approval.  Even if the Company  obtains MCA  approval,  FDA approval
would still be required  prior to marketing such a product in the United States.
To date, the Company has not filed any  application  with the FDA for any of its
planned  products.  There is no  assurance  as to if or when the Company will be
able  to  file  an  Investigational  New  Drug  application  ("IND")  (a type of
submission used to ultimately obtain FDA approval to market a new drug) with the
FDA or as to if or when after such  filing the FDA would  permit the  Company to
proceed with clinical  trials in the United  States.  Clinical  trials will seek
safety  data as well as  efficacy  data and will  require  substantial  time and
significant  funding.  There is no assurance that clinical  trials in the United
Kingdom will be fully  completed and no assurance  that clinical  trials will be
started or  completed  successfully  in the United  States or any other  country
within  any  specified  time  period,  if at  all,  with  respect  to any of the
Company's  products.  Furthermore,  the Company,  the MCA or the FDA may suspend
clinical  trials at any time if it is determined  that the  participants in such
trials are being exposed to unacceptable health risks. Aphton cannot assure that
approval for any products developed by the Company will be granted by applicable
regulatory  agencies on a timely  basis,  if at all,  or, if granted,  that such
approval  will  cover all the  clinical  indications  for which the  Company  is
seeking  approval or will not  contain  significant  limitations  in the form of
warnings,  precautions or  contraindications  with respect to conditions of use.
Any delay in obtaining,  or failure to obtain,  such approvals  would  adversely
affect the Company's ability to generate product revenue. Failure to comply with
the applicable regulatory requirements can, among other things, result in fines,
suspensions of regulatory approvals, product recalls, operating restrictions and
criminal prosecution.  In addition, the marketing and manufacturing of drugs and
biological products are subject to continuing FDA review, and later discovery of
previously unknown problems with a product, its manufacture or its marketing may
result in the FDA requiring  further  clinical  research or  restrictions on the
product  or the  manufacturer,  including  withdrawal  of the  product  from the
market.

         TECHNOLOGICAL  CHANGE;  COMPETITION.  The treatment of diseases such as
those to which  the  Company's  products  are  directed  is  subject  to  rapid,
unpredictable and significant  change.  The Company's products under development
seek to address  certain  cancers  and  diseases  currently  addressed,  to some
extent, by existing or evolving products and technologies of other biotechnology
and pharmaceutical  companies.  Competition from other biotechnology  companies,
large pharmaceutical  companies and universities and other research institutions
is intense and is expected to increase. Many of these companies and institutions
have  substantially  greater  resources,  research  and  development  staffs and
facilities  than  the  Company  and have  substantially  greater  experience  in
obtaining regulatory approval, and in manufacturing and marketing pharmaceutical
products.  In  addition,  other  technologies  may in the future be the basis of
competitive  products.  There can be no assurance that the Company's competitors
will not succeed in developing technologies and products that are more effective
than those being  developed  by the Company or that would  render the  Company's
technology and products obsolete or noncompetitive.

         UNCERTAINTY  OF  PROTECTION  OF PATENTS  AND  PROPRIETARY  RIGHTS.  The
Company's  success  will depend in large part on its ability to obtain  patents,
both in the United States and in other countries,  maintain its unpatented trade
secrets and operate without  infringing on the proprietary rights of others. The
patent positions of  biotechnology  and  pharmaceutical  companies can be highly
uncertain  and involve  complex legal and factual  questions,  and therefore the
breadth and  enforceability of claims allowed in patents obtained by the Company
cannot be predicted.

         The Company holds issued  patents and has pending  patent  applications
and patent applications in preparation. Aphton intends to file additional patent
applications,  when appropriate,  relating to its technologies,  improvements to
its  technologies  and  specific  products  it  may  develop.  There  can  be no
assurance,  however,  that its pending  applications  or patent  applications in
preparation or to be prepared will be issued as patents. Additionally, there can
be no  assurance  that  any  issued,  pending  or  future  patents,  will not be
challenged, invalidated or circumvented, or that the rights granted will provide
proprietary  protection or competitive  advantages to the Company. If any of the
Company's patents are invalidated or held to be unenforceable, the Company could
lose the  protection of rights  believed by it to be valuable,  and its business
could be materially and adversely affected.  Additionally, the existing patents,
patents  pending and patents  that may  subsequently  be obtained by the Company
will not necessarily  preclude  competitors from developing products that can be
marketed in  competition  with products  developed by the Company and thus would
substantially lessen the value of the Company's proprietary rights.

         The  commercial  success of the Company also will depend,  in part,  on
Aphton not infringing  patents issued to others.  There is no assurance that the
Company's  products  will not infringe on the patents or  proprietary  rights of
others.  The  Company may be  required  to obtain  licenses  to patents,  patent
applications or other  proprietary  rights of others.  The Company cannot assure
that any  such  licenses  would be made  available  on terms  acceptable  to the
Company,  if at all. If the  Company  does not obtain  such  licenses,  it could
encounter  delays in product  introductions  while it attempts to design  around
such patents, or the development, manufacture or sale of products requiring such
licenses  could  be  precluded.  The  Company  could  incur  substantial  costs,
including  diversion  of  management  time,  in defending  itself in  litigation
brought against it on such patents or in litigation in which the Company asserts
its patents  against  another party,  or in litigation  brought by another party
asserting its patents against the Company. If competitors of the Company prepare
and file patent  applications  in the United States that claim  technology  also
claimed by the  Company,  the Company may have to  participate  in  interference
proceedings  declared  by the U.S.  Patent  and  Trademark  Office to  determine
priority of invention,  which could result in substantial financial costs to the
Company and diversion of management  attention,  even if the eventual outcome is
favorable  to the  Company.  The  Company  believes  there will  continue  to be
significant  litigation in the industry  regarding patent and other intellectual
property rights.

         The  Company  also relies on trade  secrets to protect its  technology,
especially  where  patent  protection  is  not  believed  to be  appropriate  or
obtainable. Thus, Aphton protects its proprietary,  technology and processes, in
part, by confidentiality agreements with its employees,  consultants and certain
contractors.  There  can be no  assurance  that  these  agreements  will  not be
breached,  that the Company would have adequate remedies for any breach, or that
the Company's trade secrets will not otherwise  become known or be independently
discovered by competitors.

         DEPENDENCE ON OTHERS FOR MANUFACTURING  AND MARKETING.  The Company has
no  manufacturing  facilities  for  commercial  production of its products under
development  and has no  experience  in marketing,  sales or  distribution.  The
Company  intends to continue  establishing  arrangements  with and rely on third
parties, including large pharmaceutical companies, to manufacture,  market, sell
and  distribute  any product it  develops.  Although the Company  believes  that
parties  to  any  future   arrangements  will  have  an  economic  incentive  to
successfully perform their contractual  responsibilities,  the amount and timing
of  resources  to be  dedicated  to  these  activities  will not be  within  the
Company's  control.  There can be no  assurance  that such  parties will perform
their  obligations  as expected,  that the Company will derive any revenues from
such  arrangements  or that the Company's  reliance on others for  manufacturing
products will not result in  unforeseen  problems  with product  supply.  If the
Company should encounter delays or difficulties in its current  relationships or
in seeking to establish relationships with third parties to produce, package and
distribute any product it develops,  market introduction and subsequent sales of
such products would be adversely affected. Moreover, contract manufacturers that
the Company may use must adhere to current good  manufacturing  practice ("GMP")
regulations  enforced by the FDA through its facilities  inspection  program. If
these facilities cannot pass a pre-approval plant inspection, any FDA pre-market
approval  of the  Company's  potential  products  would be  adversely  affected.
Additionally,  such  manufacturers  are subject to continual review and periodic
inspections  by the FDA and  discovery of  previously  unknown  problems  with a
manufacturer  or facility may result in FDA  restrictions  which could adversely
affect the manufacture and marketing of the Company's products.

         DEPENDENCE ON AND NEED FOR KEY PERSONNEL. The Company is dependent upon
the services of its senior management, none of whom are subject to an employment
agreement with the Company. The Company has not insured itself against the loss,
due to death or disability, of any key personnel. The Company believes, however,
that the loss of the  services  of any key  personnel  would not have a material
adverse  effect  on the  Company.  Because  of  the  specialized  nature  of its
business,  the  Company's  success  also depends upon its ability to attract and
retain highly qualified  scientists and other technical  personnel.  The Company
faces intense  competition  for such persons and there can be no assurance  that
the Company will be able to attract or retain such individuals.

         UNCERTAIN  EFFECT OF HEALTH CARE  REFORMS.  The levels of revenues  and
profitability  of  biotechnology  and  pharmaceutical  companies,  including the
Company,  may  be  affected  by  the  continuing  efforts  of  governmental  and
third-party payors to contain or reduce the costs of health care through various
means.  For example,  in certain foreign  markets,  pricing or  profitability of
prescription  pharmaceuticals  is subject to government  control.  In the United
States, there have been, and the Company expects that there will continue to be,
a number of federal and state  proposals  to control  health  care costs.  It is
uncertain what  legislative  proposals,  if any, will be adopted or what actions
federal,  state or  third-party  payors may take in  response to any health care
reform  proposals or  legislation.  The Company cannot predict the effect health
care reforms may have on its  business,  and no assurance  can be given that any
such reforms will not have a material adverse effect on the Company. Further, to
the  extent  that  such  proposals  or  reforms  have an  adverse  effect on the
business,  financial  condition  and  profitability  of other  biotechnology  or
pharmaceutical  companies that are prospective corporate partners for certain of
the Company's products,  the Company's ability to commercialize its products may
be adversely affected.

         THIRD  PARTY   REIMBURSEMENT.   Successful   commercialization  of  the
Company's  products  will  depend  in  part  on  the  availability  of  adequate
reimbursement  from  third-party  health care  payors,  such as  government  and
private health insurers and other  organizations  for its products  intended for
human  use.  Third-party  payors are  increasingly  challenging  the  pricing of
medical  products  and  services.  Significant  uncertainty  exists  as  to  the
reimbursement  status of newly approved  health care  products.  There can be no
assurance that any product that the Company  succeeds in bringing to market will
be  eligible  for  reimbursement  at a level which is  sufficient  to enable the
Company to achieve market acceptance of its products or to maintain  appropriate
pricing.  Without such reimbursement,  the market for the Company's products may
be  limited.  Significant  reductions  in  insurance  coverage  also may have an
adverse affect on the Company's future operations.

         PRODUCT  LIABILITY  CLAIMS AND  UNINSURED  RISK.  The use of any of the
Company's products,  whether for commercial  applications or during pre-clinical
or clinical trials, exposes the Company to an inherent risk of product liability
claims in the event such  products  cause  injury or result in adverse  effects.
Such   liability   might  result  from  claims  made  directly  by  health  care
institutions,  contract  laboratories  or others selling or using such products.
The  Company  currently  maintains  product  liability  coverage  against  risks
associated with testing its products in clinical trials.  Insurance coverage for
product liabilities,  however, is becoming increasingly  expensive and difficult
to obtain.  There can be no assurance that insurance  coverage will be available
in the future at an  acceptable  cost,  if at all, or in  sufficient  amounts to
protect the Company  against such  liability.  The obligation to pay any product
liability  claim in excess of whatever  insurance the Company is able to acquire
could have a material  adverse effect on the business,  financial  condition and
future prospects of the Company.

         HAZARDOUS MATERIALS;  ENVIRONMENTAL MATTERS. The Company's research and
development  activities  involve  the  controlled  use of  hazardous  materials,
chemicals, cultures and various radioactive compounds. The Company is subject to
federal,  state and local laws and  regulations  governing the use,  generation,
manufacture, storage, air emission, effluent discharge, handling and disposal of
such materials and certain waste  products.  Although the Company  believes that
its safety  procedures for handling and disposing of such materials  comply with
the standards  prescribed by such laws and  regulations,  the risk of accidental
contamination or injury from these materials cannot be completely eliminated. In
the event of such an accident,  the Company could be held liable for any damages
that result and any such  liability  could exceed the  resources of the Company.
The  Company  may  be  required  to  incur  significant  costs  to  comply  with
environmental   laws  and   regulations   in  the  future.   Current  or  future
environmental  laws  or  regulations  could  materially   adversely  affect  the
Company's business, financial condition and results of operations.

         CONCENTRATION OF OWNERSHIP. At May 29, 1998, the Company's officers and
directors,  together  with the  principal  co-founders  of the  Company  who are
members of its Scientific  Advisory Board,  beneficially own  approximately  48%
(47% on a fully-diluted basis) of the Company's outstanding Common Stock. Such a
high  level of  ownership  by such  persons  may have a  significant  effect  in
delaying,  deferring  or  preventing  any  potential  change in  control  of the
Company.

         POSSIBLE  VOLATILITY OF STOCK PRICE.  The market price of the Company's
Common  Stock,  like that of securities of other  biotechnology  companies,  has
fluctuated  significantly  in recent  years and is  likely to  fluctuate  in the
future. Announcements by the Company or others regarding scientific discoveries,
technological   innovations,   litigation,   commercial  products,   patents  or
proprietary  rights,  the progress of clinical  trials,  government  regulation,
public  concern  as to the  safety of drugs  and  reliability  of the  Company's
testing  processes,  and general market conditions may have a significant effect
on the market price of the Common Stock.  Fluctuations in financial  performance
from period to period also may have a significant  impact on the market price of
the Common Stock.

         OUTSTANDING WARRANTS; SHARES AVAILABLE FOR FUTURE ISSUANCE AND SALE. As
of May 29,  1998,  the Company had  outstanding  warrants to purchase  2,005,300
shares of Common Stock expiring at various dates through December 31, 2015, with
exercise  prices  ranging from $0.25 to $24.00 per share,  all of which  contain
anti-dilution  provisions.  The  exercise  of these  warrants  could  result  in
dilution of the value of the Shares and the voting  power  represented  thereby.
The Company may issue additional capital stock, warrants and/or options to raise
capital in the future  which could result in  additional  dilution.  See,  "Risk
Factors  --  Capital   Requirements;   Uncertainty  of  Additional   Financing."
Additionally,  to attract  and  retain  key  personnel,  the  Company  may issue
additional securities, including stock options.

         No prediction  can be made as to the effect,  if any, that future sales
of shares of Common Stock,  or the  availability of shares for future sale, will
have on the market price of the Common Stock prevailing from time to time. Sales
of  substantial  amounts  of the  Common  Stock  in the  public  market,  or the
perception that such sales could occur,  could adversely affect the market price
of the Common Stock and may make it more  difficult  for the Company to sell its
equity securities in the future at a time and price which it deems  appropriate.
Public or private sales of substantial amounts of the Common Stock by persons or
entities that have exercised  options and/or warrants could adversely affect the
prevailing market price of the Common Stock.


                                    DILUTION

         Net  tangible  book  value  per share is  determined  by  dividing  the
difference  between the total amount of tangible  assets and the total amount of
liabilities by the number of shares of Common Stock outstanding. As of April 30,
1998, the net tangible book value of the Company was approximately $8,995,000 or
$.63 per share.

         If the Warrant is exercised  in full,  as of April 30, 1998 there would
be 14,406,217  shares of Common Stock outstanding with a net tangible book value
of $.89 per share (assuming no change to the shares  outstanding or net tangible
book value as of April 30, 1998 other than pursuant to such  conversion).  Based
on the  foregoing  assumption,  the purchase of the Warrant  Shares  through the
exercise of the Warrant at an exercise price of $17.50 per share would result in
the Warrant holder suffering immediate dilution of $16.61 per share.

         The sale of any Resale Shares by the Selling Stockholder, however, will
transfer ownership of such Shares to purchasers  participating in such offerings
so that  their  sale will not have an effect  on the  Company's  capitalization,
balance sheet or net tangible book value per share.


                              SELLING STOCKHOLDER

         The following table sets forth certain  information with respect to the
Selling  Stockholder.  The Selling  Stockholder  named below may sell the Resale
Shares  offered hereby from time to time and may choose to sell less than all or
none  of  such  shares.  The  Selling  Stockholder  has  not  had  any  material
relationship with the Company within the past three years.

         The number of shares to be owned by the Selling  Stockholder  following
the offering of the Resale  Shares  assuming all Resale  Shares are sold will be
5.2 percent of Aphton's outstanding Common Stock.



                                BENEFICIAL       MAXIMUM          BENEFICIAL
                                OWNERSHIP       NUMBER OF         OWNERSHIP
                                 PRIOR TO        SHARES         AFTER OFFERING
NAME                           OFFERING(1)       OFFERED     NUMBER OF SHARES(2)

Smith Barney                    1,425,000      715,000              710,000
Fundamental Value Fund

- --------------------
(1)      Assumes the Selling Stockholder has fully exercised the Warrant.
(2)      Assumes all Resale Shares are sold by the Selling Stockholder.

<PAGE>

                                USE OF PROCEEDS

         The Company will receive no proceeds from the sale of any Resale Shares
by the Selling Stockholder.

         Assuming the Warrant is fully exercised at the exercise price of $17.50
per share,  the proceeds  received by the Company from such  exercise will total
$3,937,500.  These  proceeds  will be added to working  capital and used to fund
operations  (including  clinical trials for Aphton's  immunogens for colorectal,
pancreatic and stomach cancers, GERD, chronic peptic ulcers, breast and prostate
cancers and endometriosis) for product development and other general purposes.


                          DESCRIPTION OF CAPITAL STOCK

         The  authorized  capital  stock of the Company  consists of  30,000,000
shares of Common Stock,  .001 par value and 2,000,000 shares of preferred stock,
$.001 par value.

COMMON STOCK

         The  holders of Common  Stock are  entitled  to one vote for each share
held of record on all matters submitted to a vote of the  shareholders.  Holders
of Common  Stock are  entitled  to  receive  ratably  such  dividends  as may be
declared by the Board of Directors out of funds legally available  therefor.  In
the event of a liquidation, dissolution or winding up of the Company, holders of
Common Stock are entitled to share ratably in all assets remaining after payment
of liabilities to creditors and to the holders of the Company's  preferred stock
that may at the time be outstanding.  Holders of Common Stock have no preemptive
rights, cumulative voting rights and no right to convert their Common Stock into
any other  securities.  There are no  restrictions  on  alienation of the Common
Stock,  and no  redemption or sinking fund  provisions  applicable to the Common
Stock.  All  outstanding  shares of Common Stock are,  and,  upon payment of the
exercise price for and issuance of the Warrant  Shares  pursuant to the Warrant,
all shares outstanding will be, fully paid and nonassessable.

PREFERRED STOCK

         No shares of preferred  stock have been issued.  The Company's Board is
authorized to divide the preferred stock into one or more classes or series and,
with respect to each class or series,  to determine the voting  powers,  full or
limited,  if any,  and such  other  relative  rights,  powers  and  preferences,
including,  without  limitation,  the dividend rate,  conversion rights, if any,
redemption price and liquidation preference and such qualifications, limitations
or restrictions thereof, as shall be stated in the resolutions providing for the
issuance of such class or series.

         Depending  upon the rights of such  preferred  stock,  the  issuance of
preferred  stock could have an adverse  effect on the holders of Common Stock by
delaying or preventing a change in control of the Company, making removal of the
present  management of the Company more  difficult or resulting in  restrictions
upon the payment of dividends and other  distributions  to the holders of Common
Stock.

WARRANTS

         As of May  29,  1998,  there  were  warrants  outstanding  to  purchase
2,005,300  shares  expiring at various  dates  through  December 31, 2015,  with
exercise  prices ranging from $0.25 to $24.00.  All of the warrants  outstanding
contain  anti-dilution  provisions.  Except  for  institutional  holders,  which
comprise  less than 20% of the total,  all of the  warrants  and the  underlying
common  stock,  if and when  issued,  have  restrictive  conditions  and holding
periods.

TRANSFER AGENTS AND REGISTRAR

        The transfer agent and registrar for the Company's  Common Stock is U.S.
Stock Transfer Corporation, Glendale, California 91204.


                              PLAN OF DISTRIBUTION

         The Warrant  entitles the Selling  Stockholder,  at any time after June
16, 1998 and not later than June 18,  2004,  to exercise the Warrant in whole at
any time, or in part (but not for less than 100 shares at any time) from time to
time,  for the purchase of up to an aggregate of 225,000  shares of Common Stock
at an  exercise  price of $17.50 per  share.  The  exercise  price is subject to
certain anti-dilution adjustments in accordance with the terms of the Warrant.

         The sale of all or a portion of the Resale Shares offered hereby by the
Selling  Stockholder may be effected in  transactions  (which may involve one or
more block  transactions)  on the NASDAQ National  Market System,  in negotiated
transactions or in the over-the-counter market at then-prevailing market prices,
at  prices  related  to  such  prices  or  at  negotiated  prices.  The  Selling
Stockholder  may effect such  transactions  by selling to or through one or more
broker-dealers,  and such broker-dealers may receive compensation in the form of
discounts,  concessions or commissions from the Selling Stockholder. The Selling
Stockholder and any  broker-dealers  that  participate in the  distribution  may
under certain circumstances be deemed to be "underwriters" within the meaning of
the Securities  Act, and any discounts,  concessions or commissions  received by
such  broker-dealers  and any profits realized on the resale of Resale Shares by
them may be  deemed  to be  underwriting  discounts  and  commissions  under the
Securities  Act. The Company and the Selling  Stockholder may agree to indemnify
such broker-dealers against certain liabilities,  including, without limitation,
certain  liabilities  under  the  Securities  Act,  or,  if  such  indemnity  is
unavailable, to contribute toward amounts required to be paid in respect of such
liabilities.

        The  Selling  Stockholder,  to the  knowledge  of the  Company,  has not
entered into any selling agreement  underwriting  agreement or other arrangement
with any underwriting  firm or broker-dealer for the offer or sale of the Resale
Shares.

         To the  extent  required  under  the  Securities  Act,  a  supplemental
prospectus  will be filed,  disclosing (a) the name of any such  broker-dealers,
(b) the number of shares involved,  (c) the price at which such shares are to be
sold,  (d) the  commissions  paid or  discounts or  concessions  allowed to such
broker-dealers,  where applicable,  (e) that such broker-dealers did not conduct
any investigation to verify the information set out or incorporated by reference
in this  prospectus,  as  supplemented,  and (f)  other  facts  material  to the
transaction.

         Under  applicable  rules and  regulations  under the Exchange  Act, any
person  engaged in a  distribution  of the Resale Shares may not  simultaneously
engage in  market-making  activities with respect to such shares for a period of
one or five business days prior to the  commencement  of such  distribution.  In
addition  to,  and  without  limiting,  the  foregoing,   each  of  the  Selling
Stockholder and any other person participating in a distribution will be subject
to the applicable  provisions of the Exchange Act and the rules and  regulations
thereunder,  including,  without limitation,  Regulation M, which provisions may
limit the  timing of  purchases  and  sales of any of the  Resale  Shares by the
Selling  Stockholder  or any such other person.  All of the foregoing may affect
the marketability of the Resale Shares.

        The  Selling  Stockholder,  to the  knowledge  of the  Company,  has not
entered into any selling agreement,  underwriting agreement or other arrangement
with any underwriting  firm or broker-dealer for the offer or sale of the Resale
Shares.

         There is no assurance that the Selling Stockholder will sell any or all
of the Resale Shares offered hereby.

         The Company has agreed to pay certain  costs and  expenses  incurred in
connection  with  the  registration  of the  Shares,  except  that  the  Selling
Stockholder will be responsible for all selling commissions,  transfer taxes and
related charges in connection with the offer and sale of Resale Shares.

         In order to comply  with the  Securities  laws of  certain  states,  if
applicable,  the Resale Shares will be sold in such jurisdictions,  if required,
only through registered or licensed broker dealers.

         The Company has agreed to  indemnify  the Selling  Stockholder  against
certain liabilities,  including,  without limitation,  certain liabilities under
the Securities Act.

         The Company has agreed to keep the registration  statement  relating to
the  offering  and  sale  by  the  Selling  Stockholder  of  the  Resale  Shares
continuously  effective  (a) in case of the Resale  Shares  until the earlier to
occur of (i) June 16,  1999 and (ii) such  earlier  date as such  Resale  Shares
shall have been sold by the Selling  Stockholder  and (b) in case of the Warrant
Shares (i) June 16, 2004 and (ii) such  earlier  date as all the Warrant  Shares
shall have been issued by the Company.


                                  LEGAL MATTERS

         The validity of the  securities  offered hereby will be passed upon for
the Company by the law firm of White & Case LLP, New York, New York.


                                     EXPERTS

        The Company's  balance sheets as of January 31, 1998, April 30, 1997 and
April 30, 1996 and  statements of  operations,  stockholders'  equity,  and cash
flows for the nine months ended January 31, 1998 and for each of the three years
in the period ended April 30, 1997  incorporated by reference in this prospectus
have   been    incorporated    herein   in    reliance    on   the   report   of
PricewaterhouseCoopers  L.L.P., independent accountants,  given on the authority
of said firm as experts in accounting and auditing.


<PAGE>
                                      II-4

                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.*

   SEC Registration fee.................................................$ 4,132
   Legal fees and expenses.............................................. 15,000
   Accounting fees and expenses.........................................  2,400
   NASDAQ Listing Fee................................................... 17,500
   Miscellaneous........................................................      0
            Total.......................................................$39,032

*  All amounts are estimated except for the SEC Registration Fee.

Item 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

         Section  145 of the  Delaware  General  Corporation  Law  (the  "DGCL")
permits the Company to indemnify its directors,  officers,  employees and agents
(each an "Insider")  against liability for each such Insider's acts taken in his
or her  capacity as an Insider in a civil  action,  suit or  proceeding  if such
actions were taken in good faith and in a manner  which the Insider  believed to
be in or not opposed to the best  interests  of the  Company,  and in a criminal
action,  suit or proceeding,  if the Insider had no reasonable  cause to believe
his or her conduct was unlawful, including under certain circumstances, suits by
or in the right of the Company for any expenses,  including attorneys' fees, and
for any  liabilities  which the Insider may have incurred in consequence of such
action,  suit or  proceeding  under  conditions  stated in said Section 145. The
Company's  Certificate  of  Incorporation  and By-Laws  provide that the Company
shall  indemnify its directors and officers to the fullest extent  authorized by
the  DGCL;   provided,   that  the   Company  may  modify  the  extent  of  such
indemnification  by  individual  contracts  with  its  directors  and  executive
officers,  and,  provided  further,  that the  Company  will not be  required to
indemnify  any director or  executive  officer in  connection  with a proceeding
initiated by such person, with certain exceptions.

         As permitted by Section  102(b)(7)  of the DGCL,  Article  NINTH of the
Company's  Certificate of Incorporation  provides that a director of the Company
will not be personally  liable to the Company or its  stockholders  for monetary
damages for breach of fiduciary duty as a director, except for liability (i) for
any breach of the director's duty of loyalty to the Company or its stockholders,
(ii) for acts or  omissions  not in good  faith  or  which  involve  intentional
misconduct or a knowing  violation of law,  (iii) under Section 174 of the DGCL,
as amended,  which concerns unlawful  payments of dividends,  stock purchases or
redemption,  or (iv) for any  transaction  from  which the  director  derived an
improper personal benefit.

         The  Company's  Certificate  of  Incorporation  permits  the Company to
secure insurance on behalf of any director, officer, employee or other agent for
any liability arising out of his or her actions in such capacity,  regardless of
whether the Company would have the power to indemnify  such person  against such
liability under the DGCL.

Item 16. EXHIBITS.




Exhibit No.                     Description

   2.1    Agreement  and  Plan of  Merger  of  Aphton  Corporation,  a  Delaware
          corporation,  and Aphton Corporation, a California corporation,  dated
          as of January 29, 1998  (incorporated  by reference to Item 2.1 of the
          Company's Current Report on Form 8-K filed on January 30, 1998).

   4.1    Specimen of Common  Stock  Certificate  (Incorporated  by reference to
          Exhibit 4.1 to the Company's  Registration Statement on Form 8-A filed
          on January 30, 1998). 

   5.1*   Opinion  and  consent  of White & Case LLP. 

   23.1*  Written  consent of PricewaterhouseCoopers L.L.P.  

   23.2   Written  consent of White & Case LLP  (included in their opinion filed
          as Exhibit 5.1 hereto).  

   24.1   Power of Attorney  appointing  Philip C. Gevas and Frederick W. Jacobs
          to sign and file  amendments  hereto (see "Power of  Attorney"  in the
          Registration Statement).

* Filed herewith.


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;

         (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 1(i) and 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 with or
          furnished to the Commission by the  Registrant  pursuant to Section 13
          or 15(d) of the Exchange Act 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 15(d) of the
     Exchange Act (and,  where  applicable,  each filing of an employee  benefit
     plan's annual report pursuant to Section 15(d) of the Exchange Act) 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)  Insofar as indemnification for liabilities arising under the Securities Act
     may be permitted to  directors,  officers  and  controlling  persons of the
     Registrant,  the  Registrant  has been  advised  that in the opinion of the
     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.


<PAGE>

                                   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  Amendment
No. 2 to be signed on its behalf by the undersigned,  thereunto duly authorized,
in the City of Miami, Florida, on the 2nd day of July, 1998.

                                      Aphton Corporation


                                      By: /s/Philip C. Gevas
                                          ----------------------------
                                           Philip C. Gevas
                                           Chairman of the Board, 
                                           Chief Executive Officer and President

         Pursuant  to the  requirements  of the  Securities  Act of  1933,  this
Amendment No. 2 has been signed by the following  persons in the  capacities and
on the dates indicated.

<TABLE>
<CAPTION>


               Signature                                 Title                         Date

<S>                                      <C>                                      <C>

                                                                 
                  *                      Chairman of the Board, Chief             July 2, 1998
- --------------------------------------   Executive Officer and President
Philip C. Gevas

                  *                      
- --------------------------------------   Treasurer and Chief Accounting Officer   July 2, 1998
Frederick W. Jacobs

                  *                      
- --------------------------------------   Director                                 July 2, 1998
Robert S. Basso

                  *                      
- --------------------------------------   Vice Chairman of the Board and           July 2, 1998
William A. Hasler                        Director

                  *                      
- --------------------------------------   Director                                 July 2, 1998
Nicholas John Stathis

By /s/ Philip C. Gevas  
   ----------------------------------
       Philip C. Gevas
       Attorney-in-fact

</TABLE>

<PAGE>



                                 EXHIBIT INDEX




 Exhibit No.             Description


    2.1   Agreement  and  Plan of  Merger  of  Aphton  Corporation,  a  Delaware
          corporation,  and Aphton Corporation, a California corporation,  dated
          as of January 29, 1998  (incorporated  by reference to Item 2.1 of the
          Company's Current Report on Form 8-K filed on January 30, 1998).

    4.1   Specimen of Common  Stock  Certificate  (Incorporated  by reference to
          Exhibit 4.1 to the Company's  Registration Statement on Form 8-A filed
          on January 30, 1998).

    5.1*  Opinion and consent of White & Case LLP.

   23.1*  Written consent of PricewaterhouseCoopers L.L.P.

   23.2   Written  consent of White & Case LLP  (included in their opinion filed
          as Exhibit 5.1 hereto).

   24.1   Power of Attorney  appointing  Philip C. Gevas and Frederick W. Jacobs
          to sign and file  amendments  hereto (see "Power of  Attorney"  in the
          Registration Statement).

* Filed herewith.


                                  White & Case
                         Limited Liability Partnership
                          1155 Avenue of the Americas
                         New York, New York 10036-2787




July 1, 1998



Aphton Corporation
80 S.W. 8th Street
Miami, Florida 33130-3047


Dear Sirs:

     We have examined the Registration  Statement on Form S-3 (the "Registration
Statement") under the Securities Act of 1933, as amended (the "Securities Act"),
in the  form in  which  it is to be  filed  today  by  Aphton  Corporation  (the
"Company") with the Securities and Exchange  Commission (the  "Commission"),  in
connection  with the sale from time to time by Smith Barney  Security and Growth
Fund (the  "Selling  Stockholder")  of 715,000  shares of common  stock,  no par
value, of the Company (the "Resale Shares"),  and the issuance by the Company to
the Selling  Stockholder  of up to 225,000 shares of common stock of the Company
(the  "Warrant  Shares")  upon  exercise  of a  warrant  issued  to the  Selling
Stockholder on June 16, 1997.  The terms of the warrant  provide that it may not
be exercised, and the Warrant Shares will not be issued, prior to June 16, 1998.
Terms  used  but not  defined  herein  have  the  meanings  given to them in the
Registration Statement.

     In connection with our opinion expressed below, we have examined  originals
or  copies  certified  to  our  satisfaction  of  such  agreements,   documents,
certificates and other statements of government officials and corporate officers
of the Company and such other papers as we have deemed relevant and necessary as
a basis for such opinion.  As to certain facts material to our opinion,  we have
relied,  to the extent that we deem such reliance proper,  upon  certificates of
public officials and of officers of the Company.  In rendering such opinion,  we
have  assumed  the  genuineness  of  all  signatures,  the  authenticity  of all
documents  submitted to us as originals and the conformity to authentic original
documents  of  all  documents  submitted  to  us  as  certified,   conformed  or
photostatic copies.


     Based upon and subject to the  foregoing,  it is our opinion that,  (i) the
Resale Shares have been validly  issued,  and are fully paid and  nonassessable,
and (ii) when the Warrant Shares are delivered  against  payment  therefor,  the
Warrant Shares will be validly issued, fully paid and nonassessable.

     We consent to the filing of this opinion as an exhibit to the  Registration
Statement and to the reference to our firm  appearing  under the caption  "Legal
Matters" in the Prospectus forming part of the Registration Statement. In giving
this consent, we do not thereby admit that we are within the category of persons
whose consent is required under Section 7 of the Securities Act or the rules and
regulations of the Commission.

                                                     Very truly yours,


                                                     WHITE & CASE LLP

TBG:GPP:LMS



                       CONSENT OF INDEPENDENT ACCOUNTANTS



We consent to the  incorporation by reference in the  registration  statement of
Aphton  Corporation  on Form S-3 (File No.  333-36925) of our report dated March
23, 1998, on our audits of the financial  statements of Aphton Corporation as of
January  31,  1998 and April  30,  1997 and 1996 and for the nine  months  ended
January 31, 1998 and each of the fiscal  years  ended April 30,  1997,  1996 and
1995,  which report is included in 1998 Annual Report on Form 10-K  incorporated
by reference in this registration statement. We also consent to the reference to
our firm under the caption "Experts".



                                                    PricewaterhouseCoopers L.L.P



Honolulu, Hawaii
July 2, 1998







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