NORTH AMERICAN SCIENTIFIC INC
S-3/A, 1997-10-16
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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     As filed with the Securities and Exchange Commission on October 16, 1997
                                                      Registration No. 333-37341
- --------------------------------------------------------------------------------
    



                     U.S. SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

   
                                 PRE-EFFECTIVE
                                 AMENDMENT NO. 1
                                       TO
                                    FORM S-3
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933
    

                         NORTH AMERICAN SCIENTIFIC, INC.
             (Exact name of registrant as specified in its charter)

              DELAWARE                                51-0366422
(State or other jurisdiction of             (I.R.S. Employer Identification No.)
  incorporation organization)


                         North American Scientific, Inc.
                              7435 Greenbush Avenue
                            North Hollywood, CA 91605
                                  818-503-9201
               (Address, including zip code, and telephone number,
                 including area code, of registrant's principal
                               executive offices)


                              MR. L. MICHAEL CUTRER
                         NORTH AMERICAN SCIENTIFIC, INC.
                              7435 GREENBUSH AVENUE
                            NORTH HOLLYWOOD, CA 91605
                                  818-503-9201

            (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)


                        With copies of communication to:


         JOHN S. STOPPELMAN, ESQ.                ALLAN J. REICH, ESQ.
          THE STOPPELMAN LAW FIRM                 D'ANCONA & PFLAUM
           1749 OLD MEADOW ROAD              30 NORTH LASALLE, SUITE 2900
             MCLEAN, VA 22102                      CHICAGO, IL 60602
               703-827-7450                         (312) 580-2000


              Approximate date of the proposed sale to the public:
                    From time to time after this registration

     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 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. [ ]

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

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>

- ----------
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>


   
                  PRELIMINARY PROSPECTUS DATED OCTOBER 16, 1997
                              SUBJECT TO COMPLETION
    


                         NORTH AMERICAN SCIENTIFIC, INC.
                         100,000 SHARES OF COMMON STOCK
                           PAR VALUE $ 0.01 PER SHARE

     This Prospectus  relates to the offer and sale by M.H. Meyerson & Co., Inc.
(the  "Selling  Securityholder")  of  up  to  100,000  shares  of  Common  Stock
underlying Common Stock Purchase Warrants (the "Common Stock") of North American
Scientific,  Inc.  (the  "Company").  The Shares  may be offered by the  Selling
Securityholder  in  transactions on the Nasdaq OTC Bulletin Board (the "Bulletin
Board"),  in privately  negotiated  transactions,  or by a  combination  of such
methods  of sale,  at  fixed  prices  that  may be  changed,  at  market  prices
prevailing  at the time of sale,  at prices  related to such  prevailing  market
prices or at negotiated prices. the Company will not receive any of the proceeds
of the sale of such shares of Common  Stock in this  Offering.  the Company will
receive proceeds of up to $162,500 from the exercise of the 100,000 Common Stock
purchase warrants by the Selling Securityholder.

     SEE "RISK  FACTORS"  ON  PAGE 4 FOR CERTAIN  CONSIDERATIONS  RELEVANT TO AN
INVESTMENT IN THESE SECURITIES.


The shares of Common Stock of the issuer are reported on the Nasdaq OTC Bulletin
Board under the symbol "NASI."

     The  Selling  Securityholder  has  agreed  to pay  all of the  expenses  in
connection with the  registration  and sale of the Common Stock being offered by
the Selling Securityholder.


        THE SECURITIES OFFERED HEREBY ARE SPECULATIVE AND INVOLVE A HIGH
    DEGREE OF RISK AND SHOULD NOT BE PURCHASED BY INVESTORS WHO CANNOT AFFORD
       THE LOSS OF THEIR ENTIRE INVESTMENT. SEE "RISK FACTORS" ON PAGE 4.


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

     The Common Stock was offered by the Company  pursuant to an exemption  from
registration provided by the Securities Act of 1933, as amended.

     NO DEALER, SALESMAN OR ANY OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
    INFORMATION OR TO MAKE ANY REPRESENTATIONS OTHER THAN THOSE CONTAINED IN
   THIS PROSPECTUS, AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS
      MUST NOT BE RELIED ON AS HAVING BEEN AUTHORIZED BY the Company. THIS
  PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF AN OFFER
   TO BUY, BY ANY PERSON IN ANY JURISDICTION IN WHICH IT IS UNLAWFUL FOR SUCH
    PERSON TO MAKE SUCH OFFER OR SOLICITATION. NEITHER THE DELIVERY OF THIS
   PROSPECTUS NOR ANY OFFER, SOLICITATION OR SALE MADE HEREUNDER, SHALL UNDER
      ANY CIRCUMSTANCES CREATE AN IMPLICATION THAT THE INFORMATION HEREIN
      IS CORRECT AS OF ANY TIME SUBSEQUENT TO THE DATE OF THE PROSPECTUS.

                 The date of this Prospectus is _________, 1997



<PAGE>

                              AVAILABLE INFORMATION


     The Company is a reporting  company under Section 13 of the  Securities and
Exchange Act of 1934 (the "Exchange Act").

     The reports and other information filed by the Company may be inspected and
copied  at the  public  reference  facilities  of the  Securities  and  Exchange
Commission  (the  "Commission")  at 450 Fifth Street,  N.W. in Washington,  D.C.
20549.  Copies may be obtained at the prescribed rates from the Public Reference
Section of the  Commission  at its  principal  office in  Washington,  D.C.  The
Commission  maintains a website that  contains  reports,  proxy and  information
statements and other information  regarding registrants that file electronically
with  the  Commission.   The  address  of  the  website  is  http://www.sec.gov.
Statements  contained in this  Prospectus  as to the contents of any contract or
other document referred to 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,  each such statement being qualified in
all respects by such reference.


     The Company has filed with the Commission a registration  statement on Form
S-3 (together with any and all amendments,  the "Registration  Statement") under
the Securities Act of 1933, as amended,  with respect to the registration of the
Common Stock.  This Prospectus does not contain all of the information set forth
in the  Registration  Statement and the exhibits  thereto,  certain  portions of
which  have been  omitted  as  permitted  by the rules  and  regulations  of the
Commission.  In  addition,  certain  documents  filed  by the  Company  with the
Commission have been  incorporated  herein by reference.  See  "Incorporation of
Certain Documents by Reference." For further  information  regarding the Company
and the Common Stock reference is made to the Registration Statement,  including
the exhibits and  schedules  thereto and the  documents  incorporated  herein by
reference.

     The  securities of the issuer are reported on the Nasdaq OTC Bulletin Board
under the symbol "NASI."

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

     The  following  documents  filed by the  Company  with the  Commission  are
incorporated herein by reference.

     (a)  Annual  Report on Form  10-KSB for the fiscal  year ended  October 31,
          1996;


     (b)  Proxy Statement on Schedule 14A as filed on February 24, 1997;


     (c)  Quarterly Report on Form 10-QSB for the quarter ended July 31, 1997;

     (d)  Quarterly Report on Form 10-QSB for the quarter ended April 30, 1997;

     (e)  Quarterly  Report on Form  10-QSB for the  quarter  ended  January 31,
          1997;

     (f)  The  description  of the  Company's  Common  Stock as contained in the
          Company's  Form 10-SB dated August 21, 1995 and amended on October 20,
          1995 and November 21, 1995.

     All reports and other  documents  filed by the Company  pursuant to Section
13(a),  13(c),  14, or 15(d) of the Securities  Exchange Act of 1934, as amended
(the "Securities  Act"),  subsequent to the date of this Prospectus and prior to
the  termination  of the offering made by the  Prospectus  shall be deemed to be
incorporated  by  reference  herein.  Any  statement  contained  in  a  document
incorporated or deemed to be incorporated by reference herein 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 incorporated  or deemed to be incorporated by reference  herein modifies
or supersedes such statement. Any such statement so modified or superseded shall
not be deemed, except as so modified or superseded, to constitute a part of this
Prospectus.

     The Company  undertakes to provide  without charge to each person to whom a
Prospectus is delivered,  on the written or oral request of such person,  a copy
of any or all of the information  incorporated by reference in this  Prospectus,
other than  exhibits to such  information.  Requests  for such copies  should be
directed to John S.  Stoppelman,  The Stoppelman Law Firm, 1749 Old Meadow Road,
Suite 610, McLean, VA 22102-4310 (telephone: 703-827-7450).

                                        2

<PAGE>

                               PROSPECTUS SUMMARY


     THE  FOLLOWING  SUMMARY IS QUALIFIED  IN ITS ENTIRETY BY THE MORE  DETAILED
INFORMATION  AND  FINANCIAL  STATEMENTS,   INCLUDING  NOTES  THERETO,  APPEARING
ELSEWHERE  IN  THIS  PROSPECTUS  OR  INCORPORATED  BY  REFERENCE  HEREIN.   EACH
PROSPECTIVE  INVESTOR IS URGED TO READ THIS  PROSPECTUS IN ITS ENTIRETY.  UNLESS
OTHERWISE  INDICATED  ALL PER  SHARE  DATA AND  INFORMATION  IN THIS  PROSPECTUS
RELATING TO THE NUMBER OF SHARES OF COMMON STOCK OUTSTANDING ASSUMES NO EXERCISE
OF THE  OUTSTANDING  WARRANTS  AND OPTIONS TO PURCHASE AN  AGGREGATE  OF 640,500
SHARES OF COMMON STOCK.


                                   THE COMPANY

     Through its  wholly-owned  subsidiary  North American  Scientific,  Inc., a
California corporation,  North American Scientific, Inc., a Delaware corporation
(the "Company"),  manufactures  and markets a broad line of low-level  radiation
sources and standards for medical, scientific and industrial uses. In June 1997,
the  Company  entered  into  agreements  with  Mentor  Corporation,  a  Delaware
corporation   ("Mentor"),  pursuant  to  which  Mentor  will distribute   I-125,
Brachytherapy  Sources,  which are used in the treatment of prostate cancer. The
I-125 Brachytherapy Sources will be manufactured by the Company. the Company was
originally  incorporated  under the Company Act of British  Columbia,  Canada in
1987 as Triple R  Resources  Corp.  The  corporate  name was  changed  to Uptown
Industries  Corp.  in 1989,  and to its  current  name in 1990.  the Company was
continued  as  a  Canadian  federal  corporation  under  the  Canadian  Business
Corporation Act in 1994, and became a Delaware corporation on April 20, 1995.

                          PRINCIPAL EXECUTIVE OFFICES

     The  principal  executive  offices  of the  Company  are  located  at  7435
Greenbush   Avenue,   North  Hollywood,   CA  91605;  its  telephone  number  is
(818)-503-9201

     Certain  considerations  are relevant to an investment in these securities.
See "Risk Factors" for a description of the  significant  risks  associated with
the purchase of these securities.

                                        3

<PAGE>

                                  RISK FACTORS

     THE SECURITIES  OFFERED HEREBY ARE SPECULATIVE AND INVOLVE A HIGH DEGREE OF
RISK AND SHOULD BE  CONSIDERED  ONLY BY PERSONS WHO CAN AFFORD THE LOSS OF THEIR
ENTIRE  INVESTMENT.  EACH  PROSPECTIVE  INVESTOR SHOULD  CAREFULLY  CONSIDER THE
FOLLOWING RISK FACTORS INHERENT IN AND AFFECTING THE BUSINESS OF the Company AND
THIS OFFERING BEFORE MAKING AN INVESTMENT DECISION.

FLUCTUATIONS IN QUARTERLY OPERATING RESULTS.

     The Company's results of operations have  historically  varied from quarter
to quarter and the Company  expects  that  further  variability  may continue to
occur and may be significant.  In the past,  operating  results have varied as a
result of a number of factors, including the size and timing of customer orders,
seasonality,  the timing of the  introduction  and  customer  acceptance  of new
products or product enhancements by the Company's competitors,  the introduction
of new  products by the Company,  changes in pricing  policies by the Company or
its   competitors,   marketing  and  promotional   expenditures,   research  and
development expenditures, and changes in general economic conditions.

MARKET PRICE FLUCTUATIONS.

     The Company has recently experienced  significant variability in the market
price of its  Common  Stock and the  volume of its  trading.  In  addition,  the
securities  markets from time to time  experience  significant  price and volume
fluctuations  that may be unrelated to the operating  performance  of particular
companies.  Announcements  of delays in the  Company's  testing and  development
schedules,  technological  innovations  or new  products  by the  Company or its
competitors,  developments or disputes concerning patents or proprietary rights,
regulatory  developments  in the United  States and  foreign  countries,  public
concern  as to the  safety of  products  containing  radioactive  compounds  and
economic and other external factors, as well as period-to-period fluctuations in
the Company's  financial  results,  may have a significant  impact on the market
price of the Common Stock.

EARLY STAGE OF PRODUCT COMMERCIALIZATION.

     Certain   of  the   Company's   products   are  in  an   early   stage   of
commercialization.  the Company expects future  revenues to be generated,  among
other products,  by sales of I-125  Brachytherapy  Sources to physicians for the
treatment of prostate cancer.  I-125  Brachytherapy  Sources have not yet become
commercially  available and the success of the product will be  dependent,  to a
large extent, on the efforts of Mentor Corporation,  which will be the exclusive
distributor  of the product.  the Company's  long-term  growth may depend on its
ability to manufacture,  market and distribute I-125 Brachytherapy  Sources to a
significant  portion  of the  medical  community.  The time frame  necessary  to
accomplish this objective is long and uncertain.  There can be no assurance that
the Company will be able to continue to manufacture I-125 Brachytherapy  Sources
at an acceptable cost and appropriate quality,  that the Company will be able to
develop new products or attain regulatory approval for such products or that the
Company will be able to increase sales in its target markets.  The likelihood of
the  Company's  future  success must be  considered  in light of these and other
difficulties,  expenses and delays frequently encountered in connection with the
commercialization of medical device products.

UNCERTAINTY OF MARKET ACCEPTANCE OF BRACHYTHERAPY SOURCES; RELIANCE ON A LIMITED
NUMBER OF PRODUCTS.

     The use of seeds  containing  radioisotopes  is a relatively  new treatment
method for prostate  cancer with a relatively  low level of market  penetration.
There can be no assurance that seeding will gain significant  market  acceptance
among physicians,  patients and health care payors. The success of the Company's
I-125  Brachytherapy  Sources  depends on maintaining  and increasing  favorable
perceptions by patients,  doctors and medical researchers  regarding the safety,
efficacy  and  cost-effectiveness  of I-125  Brachytherapy  Sources.  Management
believes  that  recommendations  by  physicians  and health  care payors will be
essential  to  increase  market  acceptance  of  seeding,  and  there  can be no
assurance that any such  recommendations  will be obtained.  Physicians will not
recommend  seeding  unless  they  conclude,  based on  clinical  data and  other
factors,  that it is an  attractive  alternative  to other  methods of  prostate
cancer  treatment.  Radical  Prostatectomy  ("RP")  has a  long  history  as the
treatment  of  choice  for  early-stage,  localized  prostate  cancer,  and many
physicians  have been trained in this  procedure.  Moreover,  in  comparison  to
seeding,  RP has more extensive long-term outcomes data due to its establishment
in the medical community. The seeding procedure employs sophisticated ultrasound
and computer  technology for the precise placement of seeds in the prostate.  An
older method of seed placement used as a treatment for prostate cancer was first
developed  in the early  1970's,  but fell into  disfavor  because the  surgical
technique then employed (the "free-hand"  technique) led to suboptimal  clinical
results.  Some negative perceptions of seeding in general persist as a result of
the failures of the  free-hand  technique.  In addition,  negative  results from
other radiation treatment methods,  particularly External Beam Radiation Therapy
("EBRT") could create an unfavorable  public  perception of radiation  treatment
for prostate cancer in general,  which would adversely affect public  acceptance
of seeding. Reimbursement levels for seeding relative to other treatment options
will also affect physician acceptance.

     Although  the  Company's  strategy  includes  exploring  opportunities  for
marketing I-125 Brachytherapy  Sources in international  markets,  physicians in
many countries,  including most European  countries,  do not aggressively  treat
prostate cancer. No assurance can be given that I-125 Brachytherapy Sources will
be an accepted method of treatment  outside the United States even if physicians
in international markets aggressively treat prostate cancer.

                                       4
<PAGE>
     The Company expects that a significant  percentage of the Company's  future
revenues  will  be  derived  from  the  sale  of  I-125  Brachytherapy  Sources,
consequently,  slow  market  acceptance  or a  reduction  in  demand  for  I-125
Brachytherapy  Sources  could have a material  adverse  effect on the  Company's
business, operating results and financial condition.

UNCERTAINTY OF FUTURE PRODUCT DEVELOPMENT; RISKS RELATED TO CLINICAL TRIALS.

     There can be no assurance that the Company will be successful in developing
and  commercializing  new products  that achieve  market  acceptance or that the
Company  will not  experience  difficulties  that  could  delay or  prevent  the
successful development, introduction and marketing of new products. There can be
no assurance that the Company's  products in  development  will prove to be safe
and effective in clinical trials under  applicable  regulatory  guidelines,  and
clinical trials may identify significant  technical or other obstacles that must
be overcome prior to obtaining necessary regulatory or reimbursement  approvals.
Even if a product overcomes these obstacles,  the Company's products will not be
used unless they present an attractive  alternative to other  treatments and the
clinical  benefits to the patient and cost savings  achieved  through use of the
Company's products outweigh the cost of such products. the Company believes that
recommendations and endorsements of physicians and patients and reimbursement by
health care payers will be essential for market acceptance of its products,  and
there  can be no  assurance  that  any  such  recommendations,  endorsements  or
reimbursements will be obtained. Failure of the Company to successfully develop,
commercialize  and market new products or the failure of the Company's  products
to achieve significant market acceptance could have a material adverse effect on
the Company's business, operating results and financial condition.

EFFECT OF REIMBURSEMENT POLICIES

     A substantial percentage of the patients treated for prostate cancer in the
United States are covered by Medicare, and, consequently, the costs for prostate
cancer treatment are subject to Medicare's  prescribed  rates of  reimbursement.
Medicare reimbursement amounts for seeding are currently significantly less than
for RP.  Although  seeding  requires less physician time than RP,  reimbursement
amounts, when combined with physician familiarity with RP, provide disincentives
for urologists to perform seeding. There can be no assurance that (i) current or
future  limitations or requirements for reimbursement by Medicare or other third
party payors for prostate cancer treatment will not materially  adversely affect
the  market  for  I-125  Brachytherapy   Sources,   (ii)  health  administration
authorities  outside  of  the  United  States  will  provide   reimbursement  at
acceptable  levels or at all or (iii) any such  reimbursement  will  continue at
rates that enable the Company to maintain prices at levels sufficient to realize
an appropriate return.

COMPETITION

     The radiation source industry is highly  competitive.  the Company competes
with several national and international companies which are substantially larger
and have greater technical,  sales,  marketing and financial  resources than the
Company.  Significant  developments  by any of these  companies  or  advances by
medical  researchers at universities,  government research facilities or private
research laboratories could render the Company's products obsolete. Furthermore,
if  demand  for  treatment  of  prostate   cancer   increases,   companies  with
substantially greater financial resources than the Company, as well as extensive
experience in research and  development,  the  regulatory  approval  process and
manufacturing  and  marketing,  may  elect to  develop  seeding  treatments  and
products that are similar to the Company's I-125  Brachytherapy  Sources.  There
can be no assurances that future  competition  will not have a material  adverse
effect on the Company's business, operating results and financial condition.

GOVERNMENT REGULATION AND LICENSE REQUIREMENTS.

     The manufacture and sale of the Company's products are subject to stringent
government  regulation in the United States and other  countries.  FDA and other
governmental approvals and clearances are subject to continual review, and later
discovery  of  previously  unknown  problems  may  result in  restrictions  on a
product's marketing or withdrawal of the product from the market. The commercial
distribution  in the United States of any new products  developed by the Company
will be dependent on obtaining the prior approval or clearance of the FDA, which
can take many years and entail significant costs. No assurances can be made that
any such  approval  will be obtained on a timely  basis or at all. In  countries
where the Company's products are not currently approved,  the use or sale of the
Company's  products will require approval by government  agencies  comparable to
the FDA.  The process of obtaining  such  approvals  is lengthy,  expensive  and
uncertain.  There  can be no  assurance  that the  necessary  approvals  for the
marketing  of the  Company's  products  in other  markets  will be obtained on a
timely basis or at all. the Company is also required to adhere to applicable FDA
regulations for Good Manufacturing Practices ("GMP"), including extensive record
keeping and reporting and periodic inspections of its manufacturing  facilities.
Similar requirements are imposed by governmental agencies in other countries.

     The  Company's  manufacturing  operations  involve  the  manufacturing  and
processing of radioactive materials,  which are subject to stringent regulation.
the Company  operates under a license from the California  Department of Health,
which is  renewable  every eight  years.  Such  license is subject to renewal on
January 31, 1998. The users of the Company's I-125 Brachytherapy Sources will be
required  to possess  licenses  issued by the state in which they  reside or the
U.S. Nuclear  Regulatory  Commission (the "NRC"). Use licenses are also required
by some of the foreign jurisdictions in which the Company may seek to market its
products.  There can be no assurance  that current  licenses held by the Company
for its  manufacturing  operations  will  remain  in  force  or that  additional
licenses required for the Company's operations will be issued. There also can be
no assurance that the Company's customers will receive or retain the radioactive

                                       5
<PAGE>

materials licenses required to possess and use the Company's products, including
I-125  Brachytherapy  Sources,  or that delays in the granting of such  licenses
will not hinder the  Company's  ability  to market  its  products.  Furthermore,
regulation  of  the  Company's  radioactive  materials  manufacturing  processes
involves the imposition of financial  requirements  related to public safety and
decommissioning,   and  there  are  high  costs  and  regulatory   uncertainties
associated  with the disposal of  radioactive  waste  generated by the Company's
manufacturing operations.  There can be no assurance that the imposition of such
requirements and the costs and regulatory  restrictions associated with disposal
of waste will not,  in the  future,  adversely  affect the  Company's  business,
operating results and financial condition and results of operations.

     Failure to obtain and maintain regulatory  approvals,  licenses and permits
could significantly delay the Company's marketing efforts. Furthermore,  changes
in or interpretations of existing regulations or the adoption of new restrictive
regulations  could  adversely  affect  either the  obtaining or timing of future
regulatory approvals.  Failure to comply with applicable regulatory requirements
could result in, among other things, significant fines, suspension of approvals,
seizures or recalls of products,  operating restrictions or criminal prosecution
and could materially adversely affect the Company's business,  operating results
and financial condition.


DEPENDENCE ON PROPRIETARY TECHNOLOGY; RISK OF TECHNOLOGY LITIGATION.

     The  Company's  future  success will depend upon its ability to protect its
proprietary  technology.  The  Company  regards  certain  of the  technology  as
proprietary  and,  to date,  the Company has relied  principally  upon  patents,
trademarks,   trade  secrets  and  contractual   restrictions  to  protect  such
proprietary  technology.  the Company currently has one U.S. patent and one U.S.
patent application pending.  However,  despite precautions taken by the Company,
it may be possible for  unauthorized  third parties to copy certain  portions of
the  Company's  technology  or to obtain and use  information  that the  Company
regards as  proprietary.  There can be no assurance  that the steps taken by the
Company will be adequate to prevent  misappropriation  of its  technology  or to
provide  an  adequate  remedy  in the  event of a  breach  by  others.  Any such
misappropriation  could  have a  materially  adverse  effect  on  the  Company's
business, operating results and financial condition.

     Although  the Company is not aware of any  infringement  by its products of
any patents or  proprietary  rights of others,  the increased  visibility of the
Company  and its  products  could  provoke  claims for  infringement  from third
parties. In future,  litigation may be necessary to enforce and protect patents,
trademarks,  trade secrets and other  intellectual  property rights owned by the
Company.  The  Company may also be subject to  litigation  to defend the Company
against  claimed  infringement of the rights of others or to determine the scope
and validity of the proprietary  rights of others.  Any such litigation could be
costly and could cause  diversion  of  management's  attention,  either of which
could  have a  material  adverse  effect on the  Company's  business,  operating
results and financial condition.  Adverse  determinations in any such litigation
could  result  in the loss of the  Company's  proprietary  rights,  subject  the
Company to significant  liabilities or require the Company to seek licenses from
third parties, any one of which could also have a material adverse effect on the
Company's  business,   operating  results  and  financial  condition.   See  "--
Litigation."


DEPENDENCE ON KEY CUSTOMERS.

     Two of the Company's  customers  accounted  for 65% of the Company's  total
revenues  in 1996 and  significant  customers  may  continue  to  account  for a
substantial  percentage  of the Company's  sales in the future.  There can be no
assurance that any of such customers will maintain their volume of business with
the  Company.  A loss of the  Company's  sales to such  customers  could  have a
material  adverse  effect on the Company's  results of  operations  unless other
customers could be found to provide the Company with similar revenues.

DEPENDENCE ON KEY PERSONNEL.


     The success of the Company is largely  dependent on the personal efforts of
key technical and senior management  personnel,  principally Michael Cutrer, its
President and Chief Executive  Officer.  the Company does not have an employment
agreement with Mr.  Cutrer,  nor does it currently have a key-man life insurance
policy on the life of Mr. Cutrer.  the Company  believes that its future success
will depend in large part upon its ability to attract and retain  highly-skilled
technical,  managerial  and  marketing  personnel  and is likely to require  the
expansion of its management  level  personnel.  Competition for radiation source
industry  personnel can be intense and the availability of capable personnel may
be limited;  thus, their services could be difficult to obtain or replace. There
can be no  assurance  that the Company  will be  successful  in  attracting  and
retaining  the  personnel  it requires  to develop  and market new and  enhanced
products and to conduct its  operations  successfully.  Any inability to attract
and retain such personnel could have a material  adverse effect on the Company's
business, operating results and financial condition.


LIMITED NUMBER OF SUPPLIERS.


     The  Company is  dependent  upon a limited  number of outside  unaffiliated
suppliers for its radioisotopes.  the Company's  principal suppliers are Nordion
International,  Inc.  and The Los  Alamos  National  Laboratories.  To date, the
Company has  generally  been able to obtain the required  radioisotopes  for its
products  as needed.  the Company  believes  that it will be able to continue to
obtain required radioisotopes from these or other sources, although there can be
no assurance thereof.  The delay or unavailability of radioisotopes could have a
material  adverse  effect  on the  Company's  production  and sales  levels  and
consequently upon its business, operating results and financial condition.

EFFECT OF CERTAIN  STATUTORY,  CHARTER AND BYLAW  PROVISIONS;  AUTHORIZATION AND
DISCRETIONARY ISSUANCE OF PREFERRED STOCK.

     Certain provisions of the Company's Certificate of Incorporation and Bylaws
could delay the removal of incumbent  directors and could make more  difficult a
merger, tender offer or proxy contest involving the Company, even if such events
would be  beneficial  to the  interests of the  stockholders.  For example,  the
Company is currently  authorized to issue 2,000,000  shares of Preferred  Stock,
par value $.01 per share,  without any vote or further  action by the  Company's
stockholders. The Preferred Stock, no shares of which are currently outstanding,
is issuable in one or more series with such rights, preferences,  maturity dates
and similar  matters as the Board of  Directors  of the Company may from time to
time  determine.  The  Company is also  subject to Section  203 of the  Delaware
General  Corporation  law  which,  subject to certain  exceptions,  prohibits  a
Delaware


                                       6
<PAGE>


Corporation  from  engaging  in a broad  range  of  business  ventures  with any
"interested  stockholder"  for a period  of  three  years  from  the  date  such
stockholder became an interested stockholder.

MANAGEMENT OF GROWTH.

     The Company's business has grown significantly over the past several years.
However,  there can be no assurance  that the Company will  continue to grow. If
growth does occur,  there can be no  assurance  the Company will be effective in
managing such future  growth,  in expanding its  facilities and operations or in
retaining  additional qualified management and other personnel required thereby.
Any  failure to manage  growth,  expand  its  operations  or attract  and retain
qualified  personnel  could  have a  material  adverse  effect on the  Company's
business, operating results and financial condition.

RAPID TECHNOLOGICAL CHANGE.

     The  markets  for the  Company's  products  are  characterized  by  ongoing
technological  developments,  evolving  industry  standards and rapid changes in
customer  requirements.  The  Company's  success  depends  upon its  ability  to
continue to enhance is existing  product  lines,  to develop and  introduce in a
timely manner new products that take advantage of technological  advances and to
respond promptly to customers' requirements.  There can be no assurance that the
Company's  current level of research and development  spending and scope will be
adequate,  that the Company  will be  successful  in  developing  and  marketing
enhancements to its existing products or new products on a timely basis, or that
its new products will adequately  address the changing needs of the marketplace.
Failure by the  Company in any of these  areas could  materially  and  adversely
affect the Company's business, operating results and financial condition.

PRODUCTS LIABILITY; INSURANCE COVERAGE.

     Personal  injuries  allegedly  resulting from the use of products that have
been or may be  developed  and sold by the  Company  may expose  the  Company to
potential liability from claims. the Company is not currently a defendant in any
product liability or personal injury lawsuit; however, there can be no assurance
that such claims will not arise in the future  based on past,  present or future
services or products  offered by the  Company.  The  Company  maintains  product
liability insurance.  However, there can be no assurance that any such insurance
will provide  adequate  coverage  against any potential  claims.  Moreover,  any
successful  product  liability  claims against the Company could  materially and
adversely affect the reputation of the Company and consequently  have a material
adverse  effect on the  Company's  business,  operating  results  and  financial
condition.

UNCERTAINTY RELATED TO HEALTH CARE REFORM.

     Political,  economic and  regulatory  influences  are subjecting the health
care  industry  in  the  United  States  to  fundamental   change.  The  Company
anticipates  that  Congress,  state  legislatures  and the  private  sector will
continue  to review and assess  alternative  health  care  delivery  and payment
systems.  Potential  approaches that have been considered include mandated basic
health care benefits,  controls on health care spending  through  limitations on
the growth of private  purchasing  groups,  price controls and other fundamental
changes to the health care delivery  system.  Legislative  debate is expected to
continue in the future,  and market forces are expected to demand reduced costs.
the Company  cannot  predict  what  impact the  adoption of any federal or state
health care reform  measures,  future private sector reform or market forces may
have on its business, operating results and financial condition.

HAZARDOUS MATERIALS.

     The  Company's  research and  development  involves the  controlled  use of
hazardous  materials.  Although the Company believes that its safety  procedures
for  handling  and  disposing  of  such  materials  comply  with  the  standards
prescribed   by  state  and  federal   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  available to the
Company.

LITIGATION.

   
     In June 1996, an action was commenced in the United States  District  Court
for the Eastern District of Virginia  entitled Best Industries,  Inc. v. CIS Bio
International  Inc. et al, Civil Action No.  96-737A.  In addition to naming CIS
Bio International,  its subsidiary CIS-US,  Inc. and certain individual officers
and directors of those  companies,  the complaint  also named the Company and L.
Micheal Cutrer as defendants.  The complaint sought equitable  relief,  ordinary
damages of $50 million and punitive  damages of up to $10 million,  on the basis
of various  allegations  with the  respect to the alleged  misappropriation  and
misuse by the  defendants of certain  purported  trade secrets of the plaintiff,
the alleged tortious  interference with the plaintiff's  business  relations and
the alleged defamation of plaintiff's character and professional  standing.  The
Company filed an answer to the complaint  denying any liability to the plaintiff
with respect to any of the allegations contained in the complaint. The plaintiff
filed a motion to voluntarily dismiss the case, without prejudice,  which motion
was  granted on  December  13,  1996,  subject  to payment of certain  costs and
attorneys'  fees to the Company.  Upon the non-payment of the assessed costs and
expenses by the plaintiff,  the case was dismissed with prejudice by order dated
January  27,  1997.  The  plaintiff  filed a notice  of  appeal  of the  Court's
dismissal on March 7, 1997,  requesting  various  forms of relief  including the
reinstatement  of the  Plaintiff's  case. The Company  believes the  allegations
contained in the  original  complaint  were without  merit and, if the action is
reinstated,  the Company  intends to  vigorously  defend such  action.  However,
reinstatement of the lawsuit,  particularly if an adverse  judgement is rendered
against  the  Company,  could have a material  adverse  effect on the  Company's
business, operating results and financial condition.
    

DIVIDEND POLICY.

     The Company has not paid any cash  dividends  on its Common  Stock and does
not expect to declare or pay any cash dividends in the foreseeable  future.


                                      7

<PAGE>

                 SELLING SECURITYHOLDER AND PLAN OF DISTRIBUTION


     All of the shares of Common  Stock being  offered  hereby are being sold by
the Selling  Securityholder,  M.H.  Meyerson & Co.,  Inc. An  aggregate of up to
100,000  shares  of  Common  Stock  may be  offered  and sold  pursuant  to this
Prospectus  by the  Selling  Securityholder.  the Company has agreed to register
such shares under the Securities Act and the Selling  Securityholder  has agreed
to pay all expenses in connection  therewith.  Such shares have been included in
the Registration Statement of which this Prospectus forms a part.

     The following table sets forth certain information regarding the beneficial
ownership of Common Stock as of September 30, 1997, assuming the exercise of all
options  exercisable  on, or within sixty days of, such date, and as adjusted to
give  effect  to  the  Offering,  by the  Selling  Securityholder.  The  Selling
Securityholder  does not hold any position or office,  and has not had any other
material  relationship with the Company or any of its predecessors or affiliates
within the last three  years,  other than  performing  services  pursuant  to an
Investment Banking Agreement.



Name                           Shares of Common Stock(1)         Percentage
- ----                           ----------------------            ----------
M.H. Meyerson & Co., Inc.              100,000                         *

TOTAL                                  100,000                         *
                                       =======                        ==


(1)  Represents   Common  Stock  underlying   Common  Stock  Purchase   Warrants
     exercisable as of the date of this Prospectus.

*    Less than one percent (1%) of the outstanding Common Stock of the Company.

     The  100,000   shares  of  Common  Stock  being   offered  by  the  Selling
Securityholder  pursuant to this Prospectus may be offered and sold from time to
time as market conditions permit on the Nasdaq OTC Bulletin Board, or otherwise,
at prices and terms then  prevailing  or at prices  related to the then  current
market price, or in negotiated transactions. The Selling Securityholder's shares
may be sold by one or more of the following methods,  without limitation:  (a) a
block  trade in which a broker or dealer so  engaged  will  attempt  to sell the
shares as agent but may  position and resell a portion of the block as principal
to facilitate the transaction;  (b) purchases by a broker or dealer as principal
and resale by such broker or dealer for its account pursuant to this Prospectus;
(c)  ordinary  brokerage  transactions  and  transactions  in which  the  broker
solicits  purchasers;  and (d)  face-to-face  transactions  between  sellers and
purchasers  without a  broker/dealer.  In  effecting  sales,  brokers or dealers
engaged by the Selling  Securityholder  may arrange for other brokers or dealers
to  participate.  Such brokers or dealers may receive  commissions  or discounts
from the Selling  Securityholder  in amounts to be negotiated.  Such brokers and
dealers  and any other  participating  brokers  and  dealers may be deemed to be
"Underwriters"  within the meaning of the Securities Act in connection with such
sales.

     To comply with certain states'  securities laws, if applicable,  the shares
of  Common  Stock  registered   hereunder  will  be  offered  or  sold  in  such
jurisdictions  only  through  registered  or  licensed  brokers or  dealers.  In
addition,  in certain  states the shares many not be sold or offered unless they
have been  registered  or qualified  for sale in such states or an exception for
registration or qualification is available and is complied with.


                                  LEGAL MATTERS

     The legality of the  securities  offered hereby will be passed upon for the
Company by D'Ancona & Pflaum.  Members of D'Ancona & Pflaum  beneficially own an
aggregate of approximately 51,700 shares of Common Stock of the Company.

                                        8

<PAGE>

                                     EXPERTS

     The  consolidated  financial  statements of the Company and its subsidiary,
incorporated  by  reference in this  Prospectus  and  Registration  Statement by
reference  to the Annual  Report on Form  10-KSB for the year ended  October 31,
1996 have been so  incorporated  in reliance  on the report of Price  Waterhouse
LLP,  independent  accountants,  as set forth in their report  thereon,  and are
included in reliance  upon said report given upon the  authority of such firm as
experts in accounting and auditing.

                                        9

<PAGE>

                                     PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

     The estimated expenses in connection with this offering are as follows:


   
         SEC Registration..............................   $   714
         Legal Fees and Expenses*......................   $10,000*
         Blue Sky Fees and Expenses*...................           
         Accounting Fees and Expenses..................   $ 3,500
         Miscellaneous*................................   $ 3,000*

                  TOTAL................................   $17,214
                                                          =======
    

- ----------
* Indicates expenses that have been estimated for the purpose of filing.

ITEM 15. Indemnification of Directors and Officers.
    
     The Certificate of Incorporation and the Bylaws of the Company provide that
the Company is required to indemnify,  in accordance with and to the full extent
now or  hereafter  permitted  by law,  any  person  who was or is a party  or is
threatened to be made a party to any  threatened,  pending or completed  action,
suit or proceeding,  whether civil,  criminal,  administrative  or investigative
(including, without limitation, an action by or in the right of the Company), by
reason of his acting as a  director  of the  Company,  and the  Company,  in the
discretion of the Board of Directors, may so indemnify a person by reason of the
fact that he is or was an officer, employee or agent of the Company or is or was
serving at the request of the Company in any other  capacity for or on behalf of
the Company,  against any liability or expense actually and reasonably  incurred
by such person in respect thereof; provided, however, that the Company shall not
be  obligated to indemnify  any such  person:  (i) with respect to  proceedings,
claims or actions initiated or brought voluntarily by such person and not by way
of defense;  or (ii) for any amounts paid in  settlement  of an action  effected
without  prior  written  consent of the Company to such  settlement of an action
effected  without the prior written  consent of the Company to such  settlement.
Such  indemnification  is not  exclusive  of any other right of  indemnification
provided by law, agreement or otherwise.




                                      II-1

<PAGE>

ITEM 16. LIST OF EXHIBITS

     (a)       Exhibits

     Exhibits  Description of Documents


     4.1  Certificate  of  Incorporation  of  the  Registrant,  incorporated  by
          reference to Exhibit 4.1 of the Registrant's Registration Statement on
          Form 10-SB, filed August 22, 1995.

     4.2  Bylaws of the  Registrant,  incorporated by reference to Exhibit 3(ii)
          of the Registrant's Registration Statement on Form 10-SB, filed August
          22, 1995

   
     5    Opinion  of   D'Ancona  & Pflaum   on  legality  of  securities  being
          registered. *
    

     23.1 Consent of D'Ancona & Pflaum (included in Exhibit 5). *

     23.2 Consent of Price Waterhouse LLP 

   
     24   Power of Attorney  (included on page II-4 of initial S-3 dated October
          7, 1997)
    


     (b)  Reports on Form 8-K: None.

   
     *    Previously filed.
    


ITEM 17.  UNDERTAKINGS

A.   Rule 415 Offering

     The undersigned Company 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 1933 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.

          (2) For the purpose of determining  any liability  under the 1933 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.

          (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.   Indemnification

     Insofar as indemnification for liabilities arising under the Securities Act
of 1933,  as amended,  may be permitted to directors,  officers and  controlling
persons of the  registrant  pursuant to the provisions  described  under Item 15
above, 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 of controlling person
in connection with the securities being registered,  the registrant will, unless
in the opinion of its counsel the matter has been

                                      II-2

<PAGE>

settled by controlling  precedent,  submit to 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.

C.   Rule 430A

     The  undersigned Registrant will:

     (1) For  determining  any liability  under the  Securities  Act,  treat the
information  omitted  from  the  form  of  prospectus  filed  as  part  of  this
registration statement in reliance upon Rule 430A and contained in the form of a
prospectus  filed by the small  business  issuer under Rule  424(b)(1) or (4) or
497(h) under the Securities Act as part of this Registration Statement as of the
time the Commission declared it effective.

     (2) For any liability under the Securities  Act, treat each  post-effective
amendment that contains a form of prospectus as a new Registration Statement for
the securities offered in the Registration  Statement,  and that the offering of
the  securities  at  that  time as the  initial  bona  fide  offering  of  those
securities.

                                      II-3

<PAGE>

                                   SIGNATURES

   
     In accordance  with 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  of filing  on Form S-3 and  authorized  this  registration
statement  to be signed on its behalf by the  undersigned,  in the County of Los
Angeles in the State of California on the 16th day of October, 1997.
    

                                           North American Scientific, Inc.



                                           By:  /s/  L. Michael Cutrer
                                                --------------------------------
                                                     L. Michael Cutrer


   
   
     In  accordance  with the  requirements  of the  Securities  Act of 1933, as
amended, this Registration  Statement was signed by the following persons in the
capacities and on this 16th  day of October, 1997.
    

           Signature                    Title
           ---------                    -----


   
/s/        *                            Chairman of the Board and Director
- -----------------------------
Irwin J. Gruverman


/s/ L. Michael Cutrer                   President, Chief Executive Officer and
- -----------------------------           Director (Principal executive, financial
L. Michael Cutrer                       and accounting officer)


/s/        *                            Director
- -----------------------------
Larry Berkin
    


                                        Director
- -----------------------------
Dr. Allan M. Green


   
/s/        *                           Director
- -----------------------------
Michael C. Lee

 
* /s/ L. Michael Cutrer                Attorney -in- Fact
- -----------------------------
L. Michael Cutrer      
    

                
                                      II-4


                       CONSENT OF INDEPENDENT ACCOUNTANTS



We  hereby  consent  to  the   incorporation  by  reference  in  the  Prospectus
constituting part of this Registration Statement on Form S-3 of our report dated
January 6, 1997 appearing on Page 8 of North American Scientific,  Inc.'s Annual
Report on Form 10-KSB for the year ended  October 31,  1996.  We also consent to
the references to us under the headings "Experts" in such Prospectus.



/s/    Price Waterhouse LLP
- ----------------------------
       Price Waterhouse LLP



   
Costa Mesa, California
October 15, 1997
    



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