NEOPROBE CORP
424B3, 2000-08-10
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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<PAGE>   1
PROSPECTUS filed pursuant to Rule 424(b)(3)
Registration No. 333-76151



                                [NEOPROBE LOGO]






                        3,000,000 SHARES OF COMMON STOCK

         The Aries Master Fund and the Aries Domestic Fund may sell shares of
common stock of Neoprobe Corporation at prices based on market conditions at the
time of sale. You should read the Section entitled "Plan of Distribution" within
this document.

         The OTC Bulletin Board reports trades of common stock under the symbol
"NEOP." On August 2, 2000, the closing price for the common stock was $0.88.

         Neoprobe is located at 425 Metro Place North, Suite 300, Dublin, Ohio
43017, and its telephone number is (614) 793-7500.

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

                    SEE "RISK FACTORS," BEGINNING ON PAGE 2.

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

NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED NOR DISAPPROVED OF THESE SECURITIES OR PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

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

                                 August 8, 2000


<PAGE>   2


                                  RISK FACTORS

NEOPROBE HAS SUFFERED SIGNIFICANT OPERATING LOSSES IN EACH YEAR IN ITS HISTORY
AND IT MAY NEVER BECOME PROFITABLE.

         Neoprobe had an accumulated deficit of approximately $120 million as of
         December 31, 1999. For the years ended December 31, 1997, 1998 and
         1999, Neoprobe's net losses were $23.2 million, $28 million and $7.9
         million. Neoprobe made an operating profit in the fourth quarter of
         1999 but it must expend substantial resources to continue development
         and marketing of its products and can not assure investors that it will
         make an operating profit in 2000.

NEOPROBE HAS LIMITED EXPERIENCE IN MANUFACTURING, MARKETING AND SELLING ITS
PRODUCTS AND IT MAY NOT BE ABLE TO DO THESE THINGS SUCCESSFULLY.

         Neoprobe began active marketing of its gamma radiation detection
         devices for use in intraoperative lymphatic mapping in 1997 and has
         limited experience in manufacturing, marketing and selling medical
         products. Since its organization in 1983, Neoprobe expended the vast
         majority of its efforts and resources in the research and development
         of its antibody based surgical cancer detection technology. During
         1998, based on disappointing regulatory feedback from the FDA and
         European regulatory authorities, Neoprobe revised its business plan to
         severely curtail research and development of that technology and to
         focus on gamma guided surgery products. Potential investors must
         evaluate Neoprobe's prospects in light of the substantial risks,
         expenses, delays and difficulties that small companies normally
         encounter in the medical device industry, which is characterized by an
         increasing number of participants, intense competition and a high rate
         of failure.

NEOPROBE MAY HAVE DIFFICULTY RAISING ADDITIONAL CAPITAL, WHICH COULD DEPRIVE IT
OF NECESSARY RESOURCES.

         Neoprobe has depended on the proceeds of sales of its securities to
         fund its losses, continue research and development and provide working
         capital. Neoprobe expects to continue to devote substantial capital
         resources to market and sell its products, to fund research and
         development of additional gamma guided surgery products, and to
         maintain existing and secure new manufacturing capacity. Neoprobe may
         need to raise additional funds through the sale of assets, public or
         private financing, collaborative relationships or other arrangements.
         Neoprobe's ability to raise additional financing may be dependent on
         many factors beyond Neoprobe's control, including the state of capital
         markets and the development or prospects for development of competitive
         technology by others. Because common stock is not listed on a stock
         exchange many investors may not be willing or allowed to purchase it or
         may demand steep discounts. The necessary additional financing may not
         be available to Neoprobe or may be available only on terms that would
         result in further dilution to the owners of



                                       2
<PAGE>   3

         Neoprobe's common stock. If Neoprobe is unable to raise additional
         funds when it needs them, it may have to curtail its operations.

NEOPROBE PRODUCTS MAY NOT ACHIEVE THE BROAD MARKET ACCEPTANCE THEY NEED IN ORDER
TO BE A COMMERCIAL SUCCESS.

         Neoprobe's products are currently only widely used in the surgical
         treatment and diagnosis of two primary types of cancer: melanoma and
         breast cancer. Neoprobe's products are used by surgeons for
         intraoperative lymphatic mapping. Neoprobe's success is dependent on
         acceptance of ILM, and of its devices for use in ILM, by the medical
         community as a reliable, safe and cost effective alternative to current
         treatments and procedures. Although Neoprobe believes that ILM has
         significant advantages over other currently competing procedures,
         broad-based clinical adoption of ILM will not occur until physicians
         outside the major cancer centers and teaching hospitals determine that
         the ILM approach is an attractive alternative to current treatments for
         use in melanoma and breast cancer and expand its use to other types of
         cancer. These things may not happen. Neoprobe's marketing efforts may
         not result in significant demand for its products, and the current
         demand for Neoprobe's products may decline.

NEOPROBE RELIES ON A THIRD PARTY FOR ITS WORLDWIDE MARKETING AND DISTRIBUTION,
WHO MAY NOT BE SUCCESSFUL IN SELLING NEOPROBE'S PRODUCTS.

         Neoprobe has limited resources and experience in sales, marketing and
         distribution of medical devices. Neoprobe currently distributes its
         products on a worldwide basis through a partner who is solely
         responsible for marketing and distributing Neoprobe's products. The
         partner assumes direct responsibility for business risks related to
         credit, currency exchange, foreign tax laws or tariff and trade
         regulation. In the past 4 years, Neoprobe has terminated marketing
         arrangements affecting major global markets 3 times including once with
         its current distribution partner. Neoprobe's current distribution
         partner has agreed to purchase minimum quantities of Neoprobe's
         products during the first three years of the initial five-year term of
         their agreement which began on October 1, 1999. While Neoprobe believes
         that its distribution partner intends to aggressively market its
         products, there can be no assurance that the distribution partner will
         succeed in marketing Neoprobe's products on a global basis, that the
         partner will make purchases in excess of its minimum annual purchase
         requirements or that the minimum purchases will generate profitability
         or adequate cash flow for Neoprobe over the long run. Neoprobe may not
         be able to maintain satisfactory arrangements with a marketing or
         distribution partner, who may not devote adequate resources to selling
         Neoprobe's products. If this happens, Neoprobe may not be able to
         sucessfully market its products, which would decrease its revenues.



                                       3
<PAGE>   4

NEOPROBE MAY LOSE OUT TO LARGER AND BETTER ESTABLISHED COMPETITORS.

         The medical device industry is intensely competitive. Neoprobe's
         competitors have significantly greater financial, technical,
         manufacturing, and distribution resources as well as greater experience
         in the medical device industry than Neoprobe. The particular medical
         conditions that can be treated using Neoprobe's ILM products can also
         be treated and diagnosed by other medical devices, procedures or drugs.
         Many of these alternatives are widely accepted by physicians and have a
         long history of use. Physicians may use Neoprobe's competitors'
         products. Neoprobe's products may not be competitive with other
         technologies. If these things happen, Neoprobe's sales and revenues
         will decline.

NEOPROBE'S PRODUCTS MAY BE DISPLACED BY NEWER TECHNOLOGY.

         The medical device industry is undergoing rapid and significant
         technological change. Third parties may succeed in developing or
         marketing technologies and products that are more effective than those
         developed or marketed by Neoprobe, or that would make Neoprobe's
         technology and products obsolete or noncompetitive. Additionally,
         researchers could develop new surgical procedures and medications that
         replace or reduce the importance of the procedures that use Neoprobe's
         products. Accordingly, Neoprobe's success will depend, in part, on its
         ability to respond quickly to medical and technological changes through
         the development and introduction of new products. Neoprobe may not have
         the resources to do this. If Neoprobe's products become obsolete and
         its efforts to develop new products do not result in any commercially
         successful products, Neoprobe's sales and reveues will decline.

NEOPROBE RELIES ON THIRD PARTIES TO MANUFACTURE ITS PRODUCTS AND NEOPROBE WILL
SUFFER IF THEY DO NOT PERFORM.

         Neoprobe relies on independent contract manufacturers for the
         manufacture of its current line of gamma guided surgery products.
         Neoprobe's business will suffer if its contract manufacturers have
         production delays or quality problems. Furthermore, medical device
         manufacturers are subject to the Good Manufacturing Practices
         regulations of the FDA, international quality standards, and other
         regulatory requirements. If Neoprobe's contractors do not operate in
         accordance with regulatory requirements and quality standards,
         Neoprobe's business will suffer. Neoprobe uses or relies on components
         and services used in its devices that are provided by sole source
         suppliers. The qualification of additional or replacement vendors is
         time consuming and costly. If a sole source supplier has significant
         problems supplying Neoprobe, its sales and revenues will be hurt until
         it could find a new source of supply.



                                       4
<PAGE>   5
NEOPROBE IS IN A HIGHLY REGULATED BUSINESS AND IT COULD FACE SEVERE PROBLEMS IF
DOES NOT COMPLY WITH ALL REGULATORY REQUIREMENTS IN THE GLOBAL MARKETS IN WHICH
NEOPROBE'S PRODUCTS ARE SOLD.

         The FDA regulates Neoprobe's medical device products in the United
         States. Foreign countries also subject Neoprobe's medical device
         products to varying government regulations. In addition, such
         regulatory authorities may impose limitations on the use of Neoprobe's
         products. FDA enforcement policy strictly prohibits the marketing of
         FDA approved medical devices for unapproved uses. Within the European
         Union, Neoprobe's products are required to display the CE mark in order
         to be sold. Neoprobe has obtained FDA clearance to market its medical
         device products and European certification to display the CE mark on
         its current line of portable radiation detection instruments. Neoprobe
         may not be able to obtain certification for any new products in a
         timely manner, or at all. Failure to comply with these and other
         current and emerging regulatory requirements in the global markets in
         which Neoprobe's products are sold could result in, among other things,
         warning letters, fines, injunctions, civil penalties, recall or seizure
         of products, total or partial suspension of production, refusal of the
         government to grant premarket clearance or premarket approval for
         devices, withdrawal of clearances or approvals, and criminal
         prosecution.

NEOPROBE'S INTELLECTUAL PROPERTY MAY NOT HAVE OR PROVIDE SUFFICIENT LEGAL
PROTECTIONS AGAINST INFRINGEMENT OR LOSS OF TRADE SECRETS.

         Neoprobe's success depends, in part, on its ability to secure and
         maintain patent protection, to preserve its trade secrets, and on its
         ability to operate without infringing on the patents of third parties.
         Neoprobe seeks to protect its proprietary positions by filing United
         States and foreign patent applications for its important inventions and
         improvements. But, domestic and foreign patent offices may not issue
         these patents. Third parties may challenge, invalidate, or circumvent
         Neoprobe's patents or patent applications in the future. Competitors,
         many of which have substantially more resources than Neoprobe and have
         made substantial investments in competing technologies, may apply for
         and obtain patents that will prevent, limit, or interfere with
         Neoprobe's ability to make, use, or sell its products either in the
         United States or abroad.

         In the United States, patent applications are secret until patents
         issue, and in foreign countries, patent applications are secret for a
         time after filing. Publications of discoveries tend to significantly
         lag the actual discoveries and the filing of related patent
         applications. Third parties may have already filed applications for
         patents for products or processes that will make Neoprobe's products
         obsolete or will limit Neoprobe's patents or invalidate its patent
         applications.

         Neoprobe typically requires its employees, consultants, and advisers to
         execute confidentiality and assignment of invention agreements in
         connection with their



                                       5
<PAGE>   6

         employment, consulting, or advisory relationships with Neoprobe. They
         may breach these agreements and Neoprobe may not obtain an adequate
         remedy for breach. Further, third parties may gain access to Neoprobe's
         trade secrets or independently develop or acquire the same or
         equivalent information.

         Agencies of the United States government conducted some of the research
         activities that led to the development of antibody technology that some
         of Neoprobe's proposed antibody based surgical cancer detection
         products use. When the United States government participates in
         research activities, it retains rights that include the right to use
         the technology for governmental purposes under a royalty-free license,
         as well as rights to use and disclose technical data that could
         preclude Neoprobe from asserting trade secret rights in that data and
         software.

NEOPROBE COULD BE DAMAGED BY PRODUCT LIABILITY CLAIMS.

         Neoprobe's products are medical devices that are used during certain
         cancer surgeries. If one of them malfunctions or a physician misuses it
         and injury results to a patient or operator, the injured party could
         assert a product liability claim against Neoprobe. Neoprobe currently
         has product liability insurance with a $10 million per occurrence limit
         which, Neoprobe believes, is adequate for its current activities.
         However, Neoprobe may not be able to continue to obtain insurance at a
         reasonable cost. Furthermore insurance may not be sufficient to cover
         all of the liabilities resulting from a product liability claim, and
         Neoprobe might not have sufficient funds available to pay any claims
         over the limits of its insurance. Because personal injury claims based
         on product liability in a medical setting may be very large, an
         underinsured or an uninsured claim could financially damage Neoprobe.

NEOPROBE MAY HAVE TROUBLE ATTRACTING AND RETAINING QUALIFIED PERSONNEL AND ITS
BUSINESS MAY SUFFER IF IT DOES NOT.

         Neoprobe's business has experienced developments the past two years,
         which have resulted in several significant changes in Neoprobe's
         strategy and business plan, including downsizing to what Neoprobe
         considers to be the minimal level of management and employees necessary
         to operate a publicly traded medical device business. Neoprobe believes
         its restructured organization is appropriate to support modest growth
         over the next few years. However, losing any members of the management
         team could have an adverse effect on Neoprobe's operations. Neoprobe's
         success is dependent on its ability to attract and retain technical and
         management personnel with expertise and experience in the medical
         device business. The competition for qualified personnel in the medical
         device industry is intense and Neoprobe may not be successful in hiring
         or retaining the requisite personnel. If Neoprobe is not able to
         attract and retain qualified technical and management personnel, it
         will suffer diminished chances of future success.

                                       6
<PAGE>   7
COMMON STOCK IS TRADED OVER THE COUNTER, WHICH MAY DEPRIVE STOCKHOLDERS OF THE
FULL VALUE OF THEIR SHARES.

         Unlisted securities may have fewer market makers, lower trading volumes
         and larger spreads between bid and asked prices than listed securities.
         These factors may result in higher price volatility and less market
         liquidity for the common stock.

NEOPROBE'S STOCKHOLDER RIGHTS PLAN, AND SOME PROVISIONS OF NEOPROBE'S CHARTER
AND APPLICABLE CORPORATE LAWS MAY HAVE THE EFFECT OF DETERRING THIRD PARTIES
FROM MAKING TAKEOVER BIDS FOR CONTROL OF NEOPROBE OR MAY BE USED TO HINDER OR
DELAY A TAKEOVER BID.

         This would decrease the chance that Neoprobe's stockholders would
         realize a premium over market price for their shares of common stock as
         a result of a takeover bid. See "DESCRIPTION OF STOCK -- Stockholder
         Rights Plan; and -- Anti-takeover Charter Provisions And Laws"

         Neoprobe's certificate of incorporation has "blank check" preferred
         stock. The board of directors may divide this stock into series and set
         their rights. The board of directors may, without prior stockholder
         approval, issue any of the shares of "blank check" preferred stock with
         dividend, liquidation, conversion, voting or other rights which could
         adversely affect the relative voting power or other rights of the
         common stock. Preferred stock could be used as a method of
         discouraging, delaying, or preventing a take-over of Neoprobe. If
         Neoprobe issues "blank check" preferred stock, it could have a dilutive
         effect upon the common stock. See "DESCRIPTION OF STOCK -- Preferred
         Stock."

BECAUSE NEOPROBE WILL NOT PAY DIVIDENDS, STOCKHOLDERS WILL ONLY BENEFIT FROM
OWNING COMMON STOCK IF IT APPRECIATES.

         Neoprobe has never paid dividends on its common stock. Neoprobe intends
         to retain any future earnings to finance its growth. Accordingly, any
         potential investor who anticipates the need for current dividends from
         his investment should not purchase common stock.

THERE IS A REMOTE POSSIBILITY THAT NEOPROBE MAY BE REQUIRED TO PAY CLAIMS
AGAINST LIQUIDATED FOREIGN SUBSIDIARIES.

         Over the past two years Neoprobe has shut down subsidiaries in two
         foreign countries. These subsidaries are in statutory liquidation or
         receivership under the laws of their respective countries. Neoprobe
         believes it has no ongoing financial obligations for the debts of
         either subsidiary. However, it is possible that creditors of a
         subsidiary could attempt to recover from Neoprobe losses relating to
         claims they have asserted against the subsidiary. Management of
         Neoprobe believes that the chance of a creditor of a subsidiary being
         able to recover its claim directly from Neoprobe is remote.



                                       7
<PAGE>   8

                              SELLING STOCKHOLDERS
<TABLE>
<CAPTION>

                                                                  COMMON STOCK
                                      ---------------------------------------------------------------------
Name                                           Shares    Shares offered           Shares        % of class
                                         beneficially                       beneficially      beneficially
                                         owned before                              owned  owned afterwards
                                             offering                         afterwards
                                                  (1)                             (1)(2)               (2)
<S>                                     <C>             <C>                 <C>              <C>

The Aries Master Fund                       4,200,000         2,100,000        2,100,000              7.0%
Aries Domestic Fund                         1,800,000           900,000          900,000              3.0%
</TABLE>

-------------------------
(1)      Includes shares of common stock issuable upon the exercise of the
         warrants owned by the Funds (2,100,000 for the Master Fund and 900,000
         for the Domestic Fund).

(2)      Assuming all shares are sold.

RELATIONSHIPS BETWEEN NEOPROBE AND THE FUNDS

         On February 16, 1999, Neoprobe entered into a Preferred Stock and
Warrant Purchase Agreement with the Funds, under which the Funds paid Neoprobe
$3 Million and Neoprobe issued to the Funds 30,000 shares of its Series B
Preferred Stock and seven year warrants to purchase an additional 2,912,621
shares of common stock. Each share of Series B Preferred Stock was convertible
into a minimum of 97 shares of common stock. But if the market value of common
stock at the time of conversion was less than $1.03, the number of shares
issuable upon conversion would have been increased, up to a maximum of 182
shares of common stock. The exercise price of the warrants issued was $1.03 per
share.

         The Purchase Agreement and the preferred stock terms contained numerous
restrictions on Neoprobe's conduct of its business. The Purchase Agreement and
the preferred stock terms also contained provisions that would allow the Funds
to require Neoprobe to redeem the Series B Preferred Stock if the common stock
were delisted, Neoprobe received a qualified opinion from its accountants or if
the common stock issuable upon conversion of the Series B Preferred Stock was
not registered. All of these conditions occurred. In order to resolve the
situation, the Funds and Neoprobe entered into a Settlement Agreement in
January, 2000.



                                       8
<PAGE>   9
         Under the Settlement Agreement, Neoprobe paid the Funds $2.5 million,
issued to them 3,000,000 shares of common stock and three year warrants to
purchase an additional 3 million shares of common stock for 74 cents per share.
The Funds returned the Series B Preferred Stock and old warrants to Neoprobe.
Additionally the Funds and Neoprobe terminated the old Purchase Agreement and
its restrictions. The Funds agreed to attend stockholders meetings for the next
2 years and to vote their shares of common stock on issues presented to those
meetings in accordance with the recommendations of Neoprobe's management. The
Funds also agreed to not buy any additional shares of common stock before
August, 2000. Neoprobe agreed to register the Fund's shares of common stock with
the SEC. If the filing or effectiveness of that registration is delayed beyond
the times set by the agreement, Neoprobe must pay a penalty in shares of common
stock to the Funds.

         Neoprobe amended its stockholder rights plan, described below under the
heading "DESCRIPTION OF STOCK -- Stockholder Rights Plan," to exempt the
acquisition of common stock by the Funds under the Purchase Agreement together
with up to 1,000,000 more shares even though these transactions may result in
the Funds owning more than 15% of the common stock. This provision has not been
changed as a result of the Settlement Agreement.

                                       9
<PAGE>   10

                              PLAN OF DISTRIBUTION

         The Funds may sell shares of common stock through brokers selected by
them individually. The Funds have not yet selected any brokers. Neither the
Funds nor Neoprobe has appointed an underwriter or coordinating broker to sell
the Funds' shares. The Funds may make these sales at any time that they choose.
Sales may be made through ordinary transactions on the OTC Bulletin Board;
special offerings in accordance with the rules of the National Association of
Securities Dealers in which the brokers may act as principals or agents; block
trades in which the brokers may attempt to sell shares as agents and may
position and resell all or part of the block as a principal to facilitate the
transaction or a combination of these methods. The Funds may also sell their
shares in privately negotiated transactions off the OTC Bulletin Board, which
need not be through brokers. The shares are expected to be sold at market
related prices prevailing at the time of sale. The pledgees, trustees and other
successors to the Funds may also use this prospectus to sell common stock. The
Funds may, if they so choose, sell their shares under this prospectus or may
sell them under Rule 144 if the shares and their sale meet the conditions of the
Rule.

         The Funds may compensate the brokers for selling shares of common stock
by giving them discounts on the shares they are selling or paying them
commissions and fees in amounts determined by negotiations between them and
their brokers. The brokers may also receive compensation from the purchasers of
shares for whom they act as agents or to whom they sell shares as principals, in
amounts determined by negotiations between the buyers and the brokers, or from
both buyer and seller. The compensation of the brokers may exceed amounts
customary in similar transactions. The brokers selected by the Funds, and any
other participating brokers may be considered to be underwriters as that term is
defined in the Securities Act of 1933, in which event discounts, commissions and
fees received by the brokers may be considered to be underwriting compensation.
The Funds may agree to indemnify their brokers against some types of
liabilities, including liabilities under the Securities Act of 1933.

         When they are selling common stock under this prospectus, the Funds may
be considered to be underwriters as that term is defined in the Securities Act
of 1933. It is unlikely that they will perform any of the functions of an
underwriter as that term is understood in its usual commercial usage, including
performing a due diligence investigation of Neoprobe or making any estimates of
the value of its securities. By making this disclosure, the Funds do not admit
that they are underwriters within the meaning of the Securities Act of 1933 and
they reserve the right to contest any allegation that they are acting as
underwriters or that they have any liabilities as underwriters.



                                       10
<PAGE>   11

                              DESCRIPTION OF STOCK

AUTHORIZED AND ISSUED STOCK

<TABLE>
<CAPTION>

                                                                NUMBER OF SHARES AT JUNE 30, 2000
                                                       -----------------------------------------------------
TITLE OF CLASS                        NAME IN THIS        AUTHORIZED        OUTSTANDING        RESERVED
                                      PROSPECTUS
<S>                                   <C>                 <C>               <C>                <C>
Common Stock, par value $0.001 per    common stock           50,000,000         26,241,777        5,210,464
share
Series A Junior Participating         Series A                  500,000                  0          500,000
Preferred Stock, par value $0.001     Preferred Stock
per share
Preferred Stock, par value $0.001     Preferred Stock         4,500,000                  0                0
per share
</TABLE>


COMMON STOCK

Dividends                           Each share will receive an equal dividend,
                                    if one is declared, which is unlikely. See
                                    "RISK FACTORS -- No Dividends."

Liquidation                         If Neoprobe is liquidated, any assets that
                                    remain after the creditors are paid and the
                                    owners of preferred stock receive any
                                    liquidation preferences will be distributed
                                    to the owners of common stock pro-rata.

Voting Rights                       One vote per share.

No Cumulative Voting                There is no cumulative voting. A simple
                                    majority can elect all of the directors at a
                                    given meeting and the minority would not be
                                    able to elect any directors at that meeting.

Free Transfer                       Common stock sold under this prospectus will
                                    be freely transferable.



                                       11
<PAGE>   12
No Personal Liability               Owners of common stock are not personally
                                    liable for Neoprobe's debts, just because
                                    they own shares of common stock.

No Preemptive Rights                Neoprobe can sell common stock to third
                                    parties without first offering it to current
                                    stockholders.

No Redemption Rights                Neoprobe does not have the right to buy back
                                    shares except in extraordinary transactions
                                    such as mergers and court approved
                                    bankruptcy reorganizations. Owners of common
                                    stock do not ordinarily have the right to
                                    require Neoprobe to buy their common stock.
                                    Neoprobe does not have a sinking fund to
                                    provide assets for any buy back.

No Conversion Rights                Common stock can not be converted into any
                                    other kind of stock except in extraordinary
                                    transactions such as mergers and court
                                    approved bankruptcy reorganizations.

PREFERRED STOCK

         Neoprobe's certificate of incorporation has "blank check" preferred
stock. The board of directors may divide this stock into series and set their
rights. Neoprobe's board of directors has created one series of preferred stock.
500,000 shares of preferred stock have been designated as Series A Junior
Participating Preferred Stock and reserved for issuance under the stockholder
rights plan described below. 63,000 shares of preferred stock were previously
designated as 5% Series B Convertible Preferred Stock but they have been
redeemed and returned to the status of unissued shares. The board of directors
may, without prior stockholder approval, issue any of the remaining 4,500,000
shares of preferred stock with dividend, liquidation, conversion, voting or
other rights which could adversely affect the relative voting power or other
rights of the common stock. Preferred stock could be used as a method of
discouraging, delaying, or preventing a take-over of Neoprobe. Although Neoprobe
has no present intention of issuing any shares of preferred stock it may do so
in the future. If Neoprobe issues preferred stock, it could have a dilutive
effect upon the common stock. See "Risk Factors -- Blank Check Preferred Stock."

STOCKHOLDER RIGHTS PLAN

Operation of the Plan. Neoprobe has a stockholder rights plan. The purpose of
the stockholder rights plan is to protect the interests of Neoprobe's
stockholders if Neoprobe is confronted with coercive or unfair takeover tactics
by encouraging third parties interested in acquiring Neoprobe to negotiate with
the board of directors. Under the plan Neoprobe distributed rights to purchase
one hundredth of a share of Series A Preferred Stock at an exercise price of $35
per right to the stockholders at the rate of one right per share of common
stock. The rights are attached to the common stock and are not exercisable until
after 15 percent of the



                                       12
<PAGE>   13
common stock has been acquired or tendered for. At that point, the rights would
be separately traded and exercisable. If a third party crosses the 15 percent
threshold, the rights would "flip-in" (but not the rights of the 15 percent
stockholder) and become rights to acquire, upon payment of the exercise price,
common stock (or, in some circumstances, other securities) with a value of twice
the exercise price of the right. If a third party were to take actions to
acquire Neoprobe, such as a merger, the rights would "flip-over" and entitle the
owners of the rights to acquire stock of the acquiring person with a value of
twice the exercise price. Neoprobe has amended its stockholder rights plan to
exempt the acquisition of common stock by Aries in the transactions described
above together with up to 1,000,000 more shares even though these transactions
may result in Aries owning more than 15% of the common stock. Neoprobe may
redeem the rights at any time before they become exercisable for $.01 per right.
The plan expires on August 28, 2005. The number of rights per share of common
stock will be adjusted in the future to reflect future splits and combinations
of, and common stock dividends on, the common stock. The exercise price of the
rights will be adjusted to reflect changes in the Series A Preferred Stock.

Series A Preferred Stock.

Redemption                          Neoprobe may redeem Series A Preferred Stock
                                    at a price equal to 100 times the current
                                    per share market price of the common stock,
                                    together with accrued but unpaid dividends.
                                    Neoprobe is not required to create a sinking
                                    fund to provide assets for a redemption.

Dividend                            A minimum quarterly dividend of $.05 per
                                    share plus an aggregate dividend of 100
                                    times any dividend declared on the common
                                    stock.

Election of Directors               If dividends on Series A Preferred Stock are
                                    in arrears in an amount equal to six
                                    quarterly payments, all owners of Preferred
                                    Stock (including holders of Series A
                                    Preferred Stock) with dividends in arrears
                                    equal to this amount, voting as a class,
                                    could elect two directors.

Liquidation                         If Neoprobe is liquidated, the holders of
                                    the Series A Preferred Stock will receive a
                                    preferred liquidation payment of $.10 per
                                    share and, after the common stock has
                                    received a proportionate distribution, will
                                    share in the remaining assets on a
                                    proportionate basis with the common stock.

Priority                            Series A Preferred Stock is senior to common
                                    stock, but junior to all other classes of
                                    preferred stock as to the payment of
                                    dividends and the distribution of assets.



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<PAGE>   14

Voting                              100 votes per share.

Exchanges                           In any merger or other transaction where
                                    common stock is exchanged, each share of
                                    Series A Preferred Stock will be entitled to
                                    receive 100 times the amount received by the
                                    common stock.

Anti-Dilution                       Neoprobe intended each share of Series A
                                    Preferred Stock to approximate 100 shares of
                                    common stock as they existed on the date the
                                    rights were distributed (August 28, 1995);
                                    therefore, the redemption price, dividend,
                                    liquidation price and voting rights will be
                                    adjusted to reflect splits and combinations
                                    of, and common stock dividends on, the
                                    common stock after that date.

Anti-Takeover Effects. Neoprobe's stockholder rights plan is designed to deter
coercive takeover tactics and otherwise to encourage persons interested in
acquiring Neoprobe to negotiate with the board of directors. The stockholder
rights plan will confront a potential acquirer of Neoprobe with the possibility
that Neoprobe's stockholders will be able to substantially dilute the acquirer's
equity interest by exercising rights to buy additional stock in Neoprobe or, in
some cases, stock in the acquirer, at a substantial discount. The plan may have
the effect of deterring third parties from making takeover bids for control of
Neoprobe or may be used to hinder or delay a takeover bid. This would decrease
the chance that Neoprobe's stockholders would realize a premium over market
price for their shares of common stock as a result of a takeover bid. See "Risk
Factors -- Anti-Takeover Provisions." The board of directors may redeem the
rights for a nominal payment if it considers the proposed acquisition of
Neoprobe to be in the best interests of Neoprobe and its stockholders.
Accordingly, the stockholder rights plan would not interfere with any merger or
other business combination which has been approved by the board of directors.
Any plan which effectively requires an acquiring company to negotiate with
Neoprobe's management may be characterized as increasing management's ability to
maintain its position with Neoprobe, including the negotiation of a transaction
which provides less value to the stockholders while providing benefits to
management.

ANTI-TAKEOVER CHARTER PROVISIONS AND LAWS

         In addition to the stockholder rights plan and the "blank check"
preferred stock described above, some features of Neoprobe's certificate of
incorporation and by-laws and the Delaware General Corporation Law (DGCL), which
are further described below, may have the effect of deterring third parties from
making takeover bids for control of Neoprobe or may be used to hinder or delay a
takeover bid. This would decrease the chance that Neoprobe's stockholders would
realize a premium over market price for their shares of common stock as a result
of a takeover bid. See "Risk Factors -- Anti-Takeover Provisions."

Limitations on Stockholder Actions. Neoprobe's certificate of incorporation
provides that stockholder action may only be taken at a meeting of the
stockholders. Thus an owner of a



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<PAGE>   15

majority of the voting power could not take action to replace the board of
directors, or any class of directors, without a meeting of the stockholders nor
could he amend the by-laws without presenting the amendment to a meeting of the
stockholders. Furthermore, under the provisions of the certificate of
incorporation and by-laws, only the board of directors has the power to call a
special meeting of stockholders. Therefore, a stockholder, even one who owns a
majority of the voting power, may neither replace sitting board of directors
members nor amend the by-laws before the next annual meeting of stockholders.

Advance Notice Provisions. Neoprobe's by-laws establish advance notice
procedures for the nomination of candidates for election as directors by
stockholders, as well as for other stockholder proposals to be considered at
annual meetings. Generally, notice of intent to nominate a director or raise
matters at meetings must be received by Neoprobe not less than 120 days before
the first anniversary of the mailing of Neoprobe's proxy statement for the
previous year's annual meeting, and must contain required information concerning
the person to be nominated or the matters to be brought before the meeting and
concerning the stockholder submitting the proposal.

Delaware Law. Neoprobe is subject to Section 203 of the DGCL, which provides
that a corporation may not engage in any business combination with an
"interested stockholder" during the three years after he becomes an interested
stockholder unless:

     -   Neoprobe's board of directors approved in advance either the business
         combination or the transaction which resulted in the stockholder
         becoming an interested stockholder;

     -   The interested stockholder owned at least 85 percent of Neoprobe's
         voting stock at the time the transaction commenced; or

     -   The business combination is approved by the Neoprobe's board of
         directors and the affirmative vote of at least two-thirds of the voting
         stock which is not owned by the interested stockholder.

         An interested stockholder is anyone who owns 15 percent or more of
Neoprobe's voting stock, or who is Neoprobe's affiliate or associate and was the
owner of 15 percent or more of Neoprobe's voting stock at any time within the
previous three years; and the affiliates and associates of any those persons.
Section 203 of the DGCL makes it more difficult for an "interested stockholder"
to implement various business combinations with Neoprobe for a three-year
period, although Neoprobe's stockholders may vote to exclude it from the law's
restrictions.

Classified Board. Neoprobe's certificate of incorporation and by-laws divide its
board of directors into three classes with staggered three year terms. There are
currently seven directors, three in two classes and one in the third. At each
annual meeting of stockholders, the terms of one class of directors will expire
and the newly nominated directors of that class will be elected for a term of
three years. The board of directors will be able to determine the



                                       15
<PAGE>   16
total number of directors constituting the full board of directors and the
number of directors in each class, but the total number of directors may not
exceed 17 nor may the number of directors in any class exceed six. Subject to
these rules, the classes of directors need not have equal numbers of members. No
reduction in the total number of directors or in the number of directors in a
given class will have the effect of removing a director from office or reducing
the term of any then sitting director. Stockholders may only remove directors
for cause. If the board of directors increases the number of directors in a
class, it will be able to fill the vacancies created for the full remaining term
of a director in that class even though the term may extend beyond the next
annual meeting. The directors will also be able to fill any other vacancies for
the full remaining term of the director whose death, resignation or removal
caused the vacancy.

         A person who has a majority of the voting power at a given meeting will
not in any one year be able to replace a majority of the directors since only
one class of the directors will stand for election in any one year. As a result,
at least two annual meeting elections will be required to change the majority of
the directors by the requisite vote of stockholders. The purpose of classifying
the board of directors is to provide for a continuing body, even in the face of
a person who accumulates a sufficient amount of voting power, whether by
ownership or proxy or a combination, to have a majority of the voting power at a
given meeting and who may seek to take control of Neoprobe without paying a fair
premium for control to all of the owners of common stock. This will allow the
board of directors time to negotiate with such a person and to protect the
interests of the other stockholders who may constitute a majority of the shares
not actually owned by that person. However, it may also have the effect of
deterring third parties from making takeover bids for control of Neoprobe or may
be used to hinder or delay a takeover bid.

LEGAL INSTRUMENT

         Neoprobe's certificate of incorporation is the legal instrument that
created its stock and gives the express terms of the common and preferred stock.
A copy of Neoprobe's certificate of incorporation is on file with the SEC.
Neoprobe is incorporated in the state of Delaware, and has filed its certificate
of incorporation with the Delaware Secretary of State. However, in order to
fully understand the rights of the different classes of stock, you should also
review Neoprobe's by-laws and its Shareholders Rights Plan, both of which are
also on file with the SEC, and consult with a lawyer who knows Delaware
corporate law.

TRANSFER AGENT

         The transfer agent for the common stock, and the rights agent for the
stockholder rights plan is Continental Stock Transfer & Trust Company, 2
Broadway, New York, New York 10004; telephone (212) 509-4000.



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<PAGE>   17
                       DOCUMENTS INCORPORATED BY REFERENCE

         The following documents that Neoprobe has filed or will file with the
SEC are incorporated in this prospectus by reference:

1.       Neoprobe's Annual Report on Form 10-K/A for the fiscal year ended
         December 31, 1999 (SEC File Number 0-26520);

2.       Neoprobe's Quarterly Report on Form 10-Q for the quarterly period ended
         March 31, 2000 (SEC File Number 0-26520);

3.       Neoprobe's Current Reports on Form 8-K dated January 19, 2000 and April
         24, 2000 (SEC File Number 0-26520);

4.       The description of the common stock contained in Neoprobe's
         Registration Statement on Form 8-A, as amended by Amendment No. 4 (SEC
         File Number 0-26520);

5.       The description of the rights to purchase Series A preferred stock
         contained in Neoprobe's Registration Statement on Form 8-A (SEC File
         No. 0-26520); and

6.       All documents subsequently filed by Neoprobe pursuant to Sections
         13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934, prior
         to the termination of the offering of the securities hereunder.

         Neoprobe will provide to each person, including a beneficial owner, to
whom a copy of this prospectus is delivered, a copy of any or all of the
information that has been incorporated by reference in this prospectus but not
delivered with the prospectus. Neoprobe will provide this information upon
written or oral request and at no cost to the requester. Requests for this
information must be made to: Brent L. Larson, Vice President--Finance and Chief
Financial Officer; Neoprobe Corporation, 425 Metro Place North, Suite 300,
Dublin, Ohio 43017; Telephone (614) 793-7500.

         You should not rely on a statement contained in any of these documents
if a statement in this prospectus or in any other subsequently filed document
which is also listed above modifies or supersedes it.

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<PAGE>   18

                                MORE INFORMATION

         Neoprobe files annual, quarterly and periodic reports, proxy statements
and other information with the SEC. You may read and copy any materials Neoprobe
files with the SEC at its Public Reference Room at 450 Fifth Street, N.W.,
Washington, D.C. 20549. The public may obtain information on the operation of
the Public Reference Room by calling the SEC at 1-800-SEC-0330.

         Neoprobe electronically files its reports, proxy statements and other
information with the SEC through the SEC's EDGAR system. The SEC maintains a
World Wide Web site on the internet that contains the reports, proxy statements
and other information filed by Neoprobe and other issuers who file
electronically through the EDGAR system. The internet address of this site (its
uniform resource locator or URL) is http://www.sec.gov.

         This prospectus is part of a registration statement under the
Securities Act of 1933 that Neoprobe has filed with the SEC. This Prospectus
does not contain all of the information in the registration statement or any of
the exhibits. You can learn more about Neoprobe and the common stock, by reading
the entire registration statement, including any amendments, and the exhibits to
the registration statement.

         The statements in this prospectus about the provisions of documents are
summaries of the documents. Summaries, by their nature, omit details of
documents. If you need to know the details of a document, you must read the
original. In most cases, Neoprobe has filed the original document with the SEC.
Summaries, by their nature, also interpret documents. The interpretations
implied by the summaries of documents in this prospectus do not control the
legal meaning of the documents, which will be determined by the parties to the
document or the courts without referring to these summaries. If you need to
interpret a document, you must read the original.

         This prospectus and the documents incorporated by reference are dated
material. Even if we deliver any of them to you at a latter date, it does not
mean that the information in those documents is correct at any time after their
dates.

         Neoprobe has not authorized any broker, salesman or other person to
give you any information or make any statements about Neoprobe, the Funds, the
common stock or its sale through this prospectus other than the information in
this prospectus.

TRADEMARKS -- Neoprobe is the owner of United States and foreign registered
trademarks "Neoprobe(R)," "RIGS(R)," "RIGScan(R)" and "neo2000(R)."
"Radioimmunoguided Surgery(TM)," "RIGSystem(TM)," "RIGS/ACT(TM)," and
"BlueTip(TM)" are commercially used trademarks of Neoprobe.



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