Document:

<PAGE>
                                                                     EXHIBIT 4.6

November 5, 2001

Dr. Augustine Y. Cheung
Chief Executive Officer
Celsion Corporation
10220-I Old Columbia Road
Columbia, MD 21046

Dear Dr. Cheung:

This letter will confirm the following agreement and understanding between
Celsion Corporation (Celsion) and Equity Communications LLC, (EC) with respect
to the following:

1.)     Celsion shall retain EC and EC agrees to be retained by Celsion as its
Financial Public Relations Counsel for a period of one (1) year commencing
November 5, 2001 and ending on November 5, 2002. A total professional fee of
Forty-Eight Thousand ($48,000) Dollars shall be payable for the one (1) year
services, which payments shall be due in increments of Four Thousand ($4,000)
Dollars per month, subject to the following:

        (1a.)  Upon initial funding of at least $3 million to Celsion from any
        investment or loan source, an amount equal to Four Thousand ($4,000)
        Dollars for each month of unpaid services rendered by EC from November
        5, 2001 under this agreement shall be paid to EC.

2.)     In addition, Celsion agrees to issue to EC and/or its assigns, Fifty
Thousand (50,000) Shares of Celsion common stock, valued at today's closing
price of $0.60 per share. The shares will be issued immediately upon the
closing of an initial funding of at least $3 million.

3.)     This agreement may be terminated by Celsion upon presentation of
written notice to EC effective on or before April 5, 2002. If it is not
terminated at that tame, it shall automatically continue for the entire
contractual period, ending November 5, 2002.

        (3a.)  Notwithstanding anything to the contrary in this Agreement,
        either party may terminate this Agreement for cause at any time, and
        nothing contained herein shall limit the remedies or relief, which may
        be sought by either party as a result of such termination.

        (3b)   If this agreement is not terminated on or about November 5,
        2002, it shall automatically continue on a month-to-month basis
        thereafter.

<PAGE>
Agreement between Celsion and EC
Page 2

4.)     Celsion agrees to reimburse EC for direct costs incurred by it on
Celsion's behalf for long distance telephone charges, photocopying, fax
transmissions, postage, messenger and courier service, express delivery
service and comparable items. Such costs will be itemized in a monthly invoice
to Celsion and will not exceed $750 per month in the aggregate without the
express approval of a Celsion officer.

        (4a.)  The following items, which would require EC to utilize outside
        vendors and/or supervise the work of others (which Celsion does not at
        the present time expect to need) would, if required, be rebilled to
        the Company only as authorized, and include a standard service fee of
        17.64%: printing, production, package distribution, mailing list
        development and maintenance, art work, consultants, photography, and
        visual presentations. EC will not engage such vendors or undertake to
        provide such services without the prior written approval of Celsion.

5.)     The cost of travel, at coach-class rates, will be reimbursed by
Celsion, and all travel commitments involving costs to be so reimbursed will
be approved by Celsion in advance. Where possible, transportation arrangements
involving service for Celsion will be made by a travel agent designated by the
Company, and such transportation will be billed directly to Celsion by the
agent. In the event Mr. Weingarten or Mr. Chizzik must fly cross-country
utilizing red-eye service, they shall be entitled to fly business class, or
first class if business class is not available using the least possible
airfare, such as frequent flyer upgrades, etc.

6.)     EC, in consideration of the remuneration stated above, agrees to
provide comprehensive financial public relation services for Celsion, to
include introductions to various security dealers, investment advisors,
analysts, and other members of the financial community; organization of and
participation in meetings with prospective investors and their
representatives; press releases where appropriate and subject to the Company's
review and approval; responding to shareholder inquiries; editorial assistance
in the development of discussion materials, business plans and shareholder
letters as may be appropriate; and assistance as may be needed in helping
Celsion to clarify and implement its long term financial objectives.

Cooperation by both parties to insure uninterrupted communications is
presumed. Celsion agrees to keep EC continuously informed of its progress; to
supply information necessary to produce releases, letters and reports in a
timely manner, and to review such documents for accuracy and completeness
before their dissemination to the public.

7.)     Representations and Procedures:

<PAGE>
Agreement between Celsion and EC
Page 3

        (7a.)  Each person executing this agreement has the full right, power,
        and authority to enter into this Agreement on behalf of the party for
        whom they have executed this Agreement, and the full right, power, and
        authority to execute any and all necessary instruments in connection
        with this Agreement, and to fully bind such party to the terms and
        conditions and obligations of this Agreement.

        (7b.)  This agreement, together with any and all exhibits, shall
        constitute the entire agreement between the parties with respect to
        the subject matter hereof and supersedes any and all prior or
        contemporaneous oral and written agreements and discussions between or
        among any of them. The parties hereto acknowledge and agree that there
        are no conditions, covenants, agreements and understandings between or
        among any of them except as set forth in this Agreement. This
        Agreement may be amended only by a further writing signed by all
        parties hereto.

        (7c.)  Venue, in the event of litigation, shall be in the State of
        California, County of Santa Barbara or in the State of Maryland in any
        federal or state court located in the greater Baltimore area. The
        losing party agrees to pay all reasonable legal costs of the
        prevailing party, including; attorney's fees up to a maximum of
        $6,000.

        (7d.)  Celsion hereby agrees and consents at its sole cost and expense
        to indemnify, and hold EC and/or Ira Weingarten and/or Steve Chizzik
        harmless from liability arising out of any legal or administrative
        action in which EC and/or Ira Weingarten is named and/or which is
        brought against EC which directly or indirectly arises out of any
        misstatement or omission of a material fact in any information, verbal
        representation, or written documentation furnished to EC by Celsion,
        which is incorporated, relied upon, or is utilized in any mariner by
        EC in drafting press releases and/or other financially and publicly
        oriented communications.

        (7e.)  This Agreement may be executed either as single document or in
        one or more counterparts, each of which shall be deemed an original
        and all of which, taken together, shall constitute one and the same
        instrument. Execution of this Agreement by facsimile signature shall
        be acceptable, and each party agrees to provide the original executed
        pages to the other party within 10 days.

        (7f.)  Any notice required to be given pursuant to this agreement
        shall be deemed given and served when such notice is deposited in the
        United States Mail, first class, certified or registered, and
        addressed to the principal offices of the parties as they appear on
        this Agreement, unless a written change of address

<PAGE>
Agreement between Celsion and EC
Page 4

        notification has been sent and received. Notice may also be given by
        overnight express service or by telecopier transmission confirmed by
        delivery of a duplicate copy of such telecopier notice by overnight
        express service or by first class mail.

Sincerely yours,

Equity Communications
By Ira Weingarten
President

Accepted by:

By:                                                , Client
   ------------------------------------------------
      Signature                     Title

Date:                                    , 2001
     ------------------------------------

DC3-72192<PAGE>
                                                                     EXHIBIT 4.7

                       PROPOSED FORM OF SETTLEMENT WARRANT

                                                       Serial Number
                                                                     ----------

Void after 5:00 p.m., Chicago Time, on [June 1, 2006]
                                                         Warrant to Purchase
                                                         [________] Shares
                                                         of Common Stock as
                                                         adjusted herein, dated
                                                         [January __, 2002]

                                 CERTIFICATE OF
                        WARRANT TO PURCHASE COMMON STOCK
                                       OF
                               CELSION CORPORATION
                      (FORMERLY CHEUNG LABORATORIES, INC.)

This Is To Certify That, FOR VALUE RECEIVED,

[_____________________________________]

its nominees, or assigns (hereinafter, the "Holder(s)") are entitled to
purchase, subject to the provisions of this Warrant (its successors, divisions
or additions), from Celsion Corporation, a Delaware Corporation (formerly Cheung
Laboratories, Inc., a Maryland corporation) duly organized, in good standing
within its domicile, and whose offices as of the date hereof are at 10220-I Old
Columbia Road, Columbia, MD 21046 (hereinafter, the "Company"), at any time on
or after January 25, 2002, and not later than 5:00 p.m., Chicago Time, on June
1, 2006, [______________] shares of restricted and legended common stock of the
Company ("Common Stock") at a purchase price equal to One Cent ($0.01 U.S.) per
share as adjusted herein.

The number of shares of Common Stock to be received upon the exercise of this
Warrant and the price to be paid for each share may be adjusted from time to
time as hereinafter set forth. The shares of Common Stock deliverable upon such
exercise, and as adjusted from time to time, are hereinafter referred to as
"Warrant Stock" and the exercise price for a share of Common Stock in effect at
any time and as adjusted from time to time is hereinafter sometimes referred to
as the "Exercise Price".

<PAGE>

The term "Warrant" used above and throughout this Certificate shall mean this
Warrant or successor Warrants issued in exchange for it for any reason pursuant
to the terms and conditions contained herein.

        1.      EXERCISE OF WARRANT. Subject to the provisions of paragraph 6
hereof, this Warrant may be exercised in whole or in part at any time or from
time to time on or after the date first written above but not later than 5:00
p.m., Chicago Time, on [June 1, 2006] or if [June 1, 2006] is a day on which
U.S. banking institutions are authorized by law to close, then on the next
succeeding day which shall not be such a day, by presentation and surrender
hereof to the Company or at the office of its stock transfer agent, if any, with
a copy of the Purchase Form attached hereto duly executed and accompanied by
payment of the Exercise Price for the number of shares specified in such form,
together with all federal and state taxes applicable upon such exercise, if any,
and the Company shall promptly issue and deliver stock certificates for the
number of shares purchased to the Holder hereof within two (2) business days in
conformity with industry practice. The Company may unilaterally extend the time
within which this Warrant may be exercised but is not obligated to do so.

If this Warrant should be exercised in part only, the Company shall, upon
surrender of this Warrant for cancellation, execute and deliver a new Warrant,
containing terms and conditions identical to this Warrant except as provided for
herein, evidencing the right of the Holder(s) to purchase the balance of the
shares purchasable hereunder.

Upon receipt of this Warrant, the executed Purchase Form and the Exercise Price
by the Company or, if then applicable, by its stock transfer agent, the
Holder(s) shall be deemed to be the holder(s) of record of the shares of Common
Stock issuable upon such exercise, notwithstanding that the stock transfer books
of the Company shall then be closed or that certificates representing such
shares of Common Stock shall not then be actually delivered to the Holder(s),
their agents or designees. The Company shall keep detailed records of the
disposition of this, successor Warrants, and any Warrant issuable hereunder,
each bearing a serial number, and shall make such records available to Holder(s)
or their agents upon request.

        2.      RESERVATION OF SHARES. The Company hereby represents and
warrants that at all times subsequent hereto there shall be reserved for
issuance and/or delivery upon exercise of this Warrant such number of shares of
its Common Stock as shall be required for issuance or delivery upon exercise of
this Warrant or any Warrant issuable hereunder.

        3.      FRACTIONAL SHARES. No fractional shares or scrip representing
fractional share shall be issued upon exercise of this Warrant. With respect to
any fraction of a share called for upon any exercises hereof, the Company shall
pay to the Holder(s) an amount in cash equal to such fraction multiplied by the
current market value of such fractional share, determined as follows:

                (a)     If the Common Stock is listed on a national securities
exchange or admitted to unlisted trading privileges on such exchange, the
current value shall be the last reported sale price of the Common Stock on such
exchange on the last business day prior to the date of exercise of this Warrant
or if no such sale is made on such day on such exchange; or

                (b)     If the Common Stock is not so listed or admitted to
unlisted trading privileges, the current value shall be the mean of the last
reported bid and asked prices reported by the National Association

<PAGE>

of Securities Dealers Automated Quotation System (or, if not so quoted on
Nasdaq, by the National Quotation Bureau, Inc.) on the last business day prior
to the day of the exercise of this Warrant; or

                (c)     If the Common Stock is not so listed or admitted to
unlisted trading privileges and bid and asked prices are not so reported, the
current fair market value shall be an amount, not less than book value or the
last known price paid by a purchaser for said Common Stock, determined in a
reasonable manner as may be prescribed by the Board of Directors of the Company.

        4.      EXCHANGE, ASSIGNMENT OF LOSS OF WARRANT. Subject to applicable
securities laws and the terms of the legend set forth in paragraph 11(b) hereof,
this Warrant Certificate is fully exchangeable and (by definition) assignable,
without expense, at the option of the Holder(s), upon presentation and surrender
hereof to the Company or at the office of its stock transfer agent, if any, for
other Warrant certificates of different denominations entitling the Holder(s)
thereof to purchase in the aggregate the same number of shares of Common Stock
purchasable hereunder.

Any assignment hereof shall be made by surrender of this Warrant Certificate to
the Company or at the office of its stock transfer agent, if any, with a
written, executed assignment, instructions and funds sufficient to pay transfer
tax (if any); whereupon the Company shall, without charge, execute and deliver a
new Warrant certificate in the name of the assignee(s) named in such instrument
of assignment and this Warrant Certificate shall promptly be canceled. This
Warrant may be divided upon presentation hereof at the office of the Company or
at the office of its stock transfer agent, if any, together with a written
notice, specifying the names and denominations in which new Warrants are to be
issued, and signed by the Holder thereof. The terms "Warrant" and "Warrants" as
used herein include any Warrants issued in substitution for, exchange or
replacement of this Warrant, or into or for which this Warrant may be divided or
exchanged.

Upon receipt of the Company of evidence reasonably satisfactory to it of the
loss, theft, destruction or mutilation of this Warrant, and, in the case of
loss, theft or destruction, of reasonably satisfactory indemnification, and upon
surrender and cancellation of this Warrant, if mutilated, the Company will
execute and deliver a new Warrant of like tenure and date. Any such new Warrant
executed and delivered shall constitute an additional contractual obligation on
the part of the Company, whether or not this Warrant so lost, stolen, destroyed
or mutilated shall be at any time enforceable by anyone. Nevertheless, neither
the Company nor the Holder(s) anticipate that this Warrant or any successor
Warrant shall itself be registered (rather that the underlying shares shall be
registered), the Company shall not impose unreasonable burdens on the Holder(s)
with respect to indemnification if same becomes necessary.

        5.      RIGHTS OF THE HOLDERS. The Holder(s) shall not, by virtue
hereof, be entitled to any rights of a shareholder in the Company, either at law
or equity, and the rights of the Holder(s) are limited to those expressed in the
Warrant and are not enforceable against the Company except to the extent set
forth herein, PROVIDED HOWEVER, that the Company shall, in a timely manner,
provide Holder(s) with a copy of each

                                      -3-
<PAGE>

and every press release, mailing to shareholders and periodic filing with the
U.S. Securities and Exchange Commission (the "Commission") made by the Company,
and provided that the Company shall be, at all times during the tenure of this
Warrant or its successors, in compliance with all its contractual obligations to
Riker and its affiliates. Notwithstanding anything contained in paragraph 21
hereof to the contrary, any document required to be delivered by the Company
pursuant to this paragraph 5 shall be deemed sufficiently delivered if sent by
facsimile or e-mail transmission to the Holder, with confirmation thereof, at
such facsimile number or e-mail address as the Holder may from time to time
provide to the Company in accordance with the provisions of paragraph 21 hereof.

        6.      ADJUSTMENTS TO EXERCISE PRICE AND NUMBER OF SHARES.

                (a)     In the case of a dividend or other distribution on any
stock of the Company or subdivision or combination of the outstanding shares of
Common Stock, the exercise price and the number of shares issuable hereunder
shall be adjusted as follows: the Exercise Price shall be proportionately
decreased in the case of each such issuance (on the day following the date fixed
for determining shareholders entitled to receive such dividend or distribution)
or proportionately decreased in the case of each such subdivision or
proportionally increased in the case of each such combination (on the date that
such subdivision or combination shall become effective).

        Upon any adjustment of the Exercise Price, the Holder(s) of this Warrant
shall thereafter (until another such adjustment) be entitled to purchase, at the
new Exercise Price, the number of shares, calculated to the nearest full share,
obtained by multiplying the number of shares of Common Stock initially issuable
upon exercise of this Warrant by the Exercise Price in effect on the date hereof
and dividing the product so obtained by the new Exercise Price.

                (b)     Anything in this paragraph 6 to the contrary
notwithstanding, the Company shall not be required to give effect to any
adjustment in the Exercise Price unless and until the net effect of one or more
adjustments, determined as above provided, shall have required a change of the
Exercise Price by at least One Cent ($0.01 U.S.), but when the cumulative net
effect of more than one adjustment so determined shall be to change the actual
Exercise Price by at least One Cent, such change in the Exercise Price shall
thereupon be given effect.

        7.      INTENTIONALLY OMITTED.

        8.      OFFICER'S CERTIFICATE. Whenever the Exercise Price shall be
adjusted as required by the provisions of paragraph 6 hereof, the Company shall
forthwith file in the custody of its Secretary or an Assistant Secretary at its
principal office, and with its stock transfer agent, if any, an officer's
certificate showing the adjusted Exercise Price determined as herein provided
and setting forth in reasonable detail the facts requiring such adjustment. Each
such officer's certificate shall be made available at all reasonable times for
inspection by the Holder(s) and the Company shall, forthwith after each such
adjustment, deliver a copy

                                      -4-
<PAGE>

of such certificate to the Holder(s) and each of them. Unless disputed in
writing by the Holder hereof within thirty (30) days, such certificate shall be
conclusive as to the correctness of such adjustment.

        9.      GENERAL NOTICES TO WARRANT HOLDERS. So long as any portion of
this Warrant (or any successor Warrant) shall be outstanding and unexercised (a)
if the Company shall pay any dividend or make any distribution upon the Common
Stock or (b) if the Company shall offer to the holders of Common Stock for
subscription or purchase by them any shares of stock of any class or any other
rights or (c) if any capital reorganization of the Company, reclassification of
the capital stock of the Company, consolidation or merger of the Company with or
into another corporation, sale, lease or transfer of all or substantially all of
the property and assets of the Company to another corporation or engage in
voluntary or involuntary dissolution, liquidation or winding up of the company,
then the Company shall cause to be delivered to the Holder(s), at least thirty
(30) days prior to the relevant date, a notice containing a brief description of
the proposed action and stating the date of which a record is to be taken for
the purpose of such dividend, distribution of rights, or such reclassification,
reorganization, consolidation, merger, conveyance, lease, dissolution,
liquidation or winding up is to take place and the date, if any, is to be fixed
as of which the holders of Common Stock of record shall be entitled to exchange
their shares of Common Stock of record for securities or other property
deliverable upon such reclassification, reorganization, consolidation, merger,
conveyance, dissolution, liquidation or winding up.

        10.     RECLASSIFICATION, REORGANIZATION OR MERGER. In case of any
reclassification, capital reorganization or other change of outstanding shares
of Common Stock of the Company (other than a change in par value, or from par
value to no par value, or from no par value to par value) or as a result of an
issuance of Common Stock by way of dividend or other distribution or of a
subdivision or combination, or in case of any consolidation or merger of the
Company with or into another corporation (other than a merger with a subsidiary
in which merger the Company is the continuing corporation and which does not
result in any reclassification, capital reorganization or other change of
outstanding shares of Common Stock of the class issuable upon exercise of this
Warrant) or in case of any sale or conveyance to another corporation of the
property of the Company as an entirety or substantially as an entirety
(collectively, a "Triggering Event"), the Company shall use good faith efforts
to cause effective provision to be made so that the Holder(s) shall have the
right thereafter (and shall have said right for the same period of time
remaining on any unexercised portion of this Warrant), without immediately
exercising this Warrant, to purchase the kind and amount of shares of stock and
other securities and property receivable upon such reclassification, capital
reorganization or other change, consolidation, merger, sale or conveyance.

Any such provision shall include provision for adjustments which shall be as
nearly equivalent as may be practicable to the adjustments provided for in this
Warrant. However, in the event that the Company, using its good faith efforts,
is unable to negotiate with the acquiring entity the assumption of the Warrants
as provided in the preceding portion of this paragraph, then and in such event
this Warrant shall terminate, to the extent not previously exercised, as of the
record date for such transaction upon and only upon payment of a "Retirement
Fee" to the Holder(s) hereof.

                                      -5-
<PAGE>

This Retirement Fee shall consist of the same kind of property (including cash,
if any) to be received by the Company's stockholders pursuant to the Triggering
Event (and, at parity with holders of Common Stock, treated in accordance with
all the other terms and conditions, including timing and manner of payment for
the purchase) and the Company herein agrees that said Retirement Fee may be
arrived at by private negotiation between the Company and the Holder(s) or may
be arbitrated in accordance with the provisions herein provided.

However, the Company now and specifically agrees that, in the event of such
private negotiation, it shall accept an amount to be paid to the Holder(s) (as a
senior obligation of the company in any such transaction) in arbitration or
negotiation which is not less than the lowest sum per Warrant which shall result
from application of any then applicable Warrant Valuation Techniques (such as
the Black-Scholes Model) which may be applied to publicly traded warrants
covering publicly traded common stock, it being intended by the Company and the
Holder(s) that the Retirement Fee should reflect a warrant premium factor
commonly determinable by the aforementioned models. Said Retirement Fee shall be
a senior obligation of the Company and shall be paid to Holder(s) from first
proceeds of any sale or merger in cash unless otherwise negotiated between the
Company and Riker (the original Holder).

All subsequent Holders shall agree, by acceptance of assignment of any portion
of the Warrant covered by this Certificate, to be bound by this provision. All
costs and expenses directly attributable to the determination of the Retirement
Fee (including but not limited to the costs of outside appraisal(s)) shall be at
the expense of the Company.

The foregoing provisions of this paragrap10 shall similarly apply to successive
reclassification, consolidations, mergers, sales or conveyances. In the event
that in any such capital reorganization or reclassification, consolidation,
merger, sale or conveyance, additional shares of Common Stock shall be issued in
exchange, conversion, substitution or payment, in whole or in part, for or of a
security of the Company other than Common Stock, any such issue shall be treated
as an issue of Common Stock covered by the provisions of paragraphs 3, 6, and 9
hereof, with the amount of the consideration received upon the issue thereof
being determined by the Board of Directors of the Company in consultation with
the Company's auditors, such determination to be final and binding on the
Holder(s).

        11.     TRANSFER TO COMPLY WITH THE SECURITIES ACT OF 1933.

                (a)     This Warrant or the Warrant Stock or any other security
issued or issuable upon exercise of this Warrant may not be sold, transferred or
otherwise disposed of except to a person who, in the opinion of counsel
reasonably satisfactory to the Company, is a person to whom this Warrant or such
Warrant Stock may legally be transferred pursuant to paragraph 4 hereof without
registration and without the delivery of a current prospectus under the
Securities Act with respect thereto; and then only against receipt by the
Company of an agreement from such person to comply with the provisions of this
paragraph 11 with respect

                                      -6-
<PAGE>

to any resale or other disposition of such securities.

        (b)     The Company may cause the following legend to be set forth on
each certificate representing Warrant Stock or any other security issued or
issuable upon exercise of this Warrant not theretofore distributed to the public
pursuant to paragraphs 12, 13, or 14 hereof, unless counsel for the Company is
of the opinion as to any such certificate that such legend is unnecessary.

        "THE SECURITIES REPRESENTED BY THIS CERTIFICATE MAY NOT BE OFFERED FOR
SALE, SOLD OR OTHERWISE TRANSFERRED EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION
STATEMENT UNDER THE SECURITIES ACT OF 1933 (THE "ACT"), OR PURSUANT TO AN
EXEMPTION FROM REGISTRATION UNDER THE ACT."

        12.     DEMAND REGISTRATION. If at any time, after the next public
offering of registered Common Shares of the Company (a public offering being
defined as one in which the Company is in receipt of funds of not less than Five
Million Dollars ($5,000,000.00 U.S.) raised by an underwriter pursuant to a
Registration Statement (the Form of which shall then be applicable) declared
effective by the Commission and funds received in full by the Company) the
Holder(s), or any of them, shall decide to sell or otherwise dispose of Warrant
Stock then owned or to be owned upon intended exercise of this Warrant by such
Holder(s), such Holder(s) may give written notice to the Company of the proposed
disposition (but, if other than Riker, must simultaneously give notice to
Riker), specifying the number of shares of Warrant Stock to be sold or disposed
of and requesting that the Company prepare and file a registration statement
under the Securities Act of 1933, as amended (the "Securities Act"), covering
such Warrant Stock.

The Company shall within ten (10) days thereafter give written notice to the
other Holders of Warrants or Warrant Stock of such request and each of the other
Holders shall have the option for a period of thirty (30) days after receipt by
it (them) of notice from the Company to include its (their) Warrant Stock in
such registration statement. The Company shall use its best efforts to cause an
appropriate registration statement (the "Registration Statement") covering such
Warrant Stock to be filed with the Commission and to become effective as soon as
reasonably practicable and to remain effective until the completion of the
distribution of the Warrant Stock to be offered or sold; provided, however, that
not more than once in any twelve (12) month period the Company shall have the
right to postpone for a period of up to sixty (60) days any demand made pursuant
to this Warrant if the underwriters for such offering advise the Company in
writing that market conditions make such a postponement advisable to the
Company.

The Holder(s) whose Warrant Stock is (are) included in a Registration Statement
is (are) hereinafter referred to as the "Selling Shareholder(s)".

Each notice delivered by a Selling Shareholder(s) to the Company pursuant to
this paragraph 12 shall specify the Warrant Stock intended to be offered and
sold by such Selling Shareholder(s), express such Selling Shareholder(s) present
intent to offer such Common Shares for distribution, and contain the undertaking
of such Selling Shareholder(s) to provide all information and materials and to
take all action as may be required

                                      -7-
<PAGE>

in order to permit the Company to comply with all applicable requirements of the
Securities Act, and any rules and regulations promulgated thereunder, and to
obtain acceleration of the effective date of such Registration Statement.

The Company shall not be obligated to file more than three (3) Registration
Statements pursuant to the foregoing provisions of this paragraph 12. The
Company shall bear all of the Costs and Expenses (as hereinafter defined in
paragraph 20 hereof) of the first such registration. The Selling Shareholder(s)
shall bear the costs and expenses of all further registrations pursuant to this
paragraph 12. A demand for registration under this paragraph 12 will not count
as such until the Registration Statement has become effective.

In the event that any Holder's Warrant Shares previously have been registered
under the Securities Act, then this paragraph 12 shall not be applicable to such
previously registered shares.

        13.     SHELF REGISTRATION BY ORIGINAL HOLDER. At any time and from time
to time during the term of this Warrant or its successors (including renewals
and extensions as provided for herein) Riker, and only Riker (as the original
Holder hereof), may demand (and actually expects) that the Company will file a
Registration Statement with the Commission for the registration of underlying
shares issuable upon exercise of this Warrant or any part thereof, whether or
not said Warrant has, in the interim been assigned or re-assigned to other
parties. In this event, the Company shall pay all of the Costs and Expenses of
said Registration for each such demand.

Once filed, the Company shall be obligated to continue this "shelf registration"
for the maximum time allowable under the then relevant regulations, at its sole
expense.

In the event that any Holder's Warrant Shares previously have been registered
under the Securities Act, then this paragraph 13 shall not be applicable to such
previously registered shares.

        14.     PROCEDURE FOR DEMAND REGISTRATION. In connection with the filing
of a Registration Statement pursuant to paragraph 12 hereof, and in
supplementation and not in limitation of the provisions thereof, the Company
shall:

                (a)     Notify the Selling Shareholder(s) as to the filing of
the Registration Statement and of all amendments or supplements thereto filed
thirty (30) days prior to the effective date of said Registration Statement;

                (b)     Notify the Selling Shareholder(s), promptly after the
Company shall receive notice thereof, of the time when said Registration
Statement became effective or when any amendment or supplement to any prospectus
forming a part of said Registration Statement has been filed;

                (c)     Notify the Selling Shareholder(s) promptly of any
request by the Commission for the

                                      -8-
<PAGE>

amending or supplementing of such Registration Statement or prospectus or for
additional information;

                (d)     Prepare and promptly file with the Commission, and
promptly notify the Selling Shareholder(s) of the filing of, and amendments or
supplements to such Registration Statement or prospectus as may be necessary to
correct any statements or omissions if, at any time when a prospectus relating
to the Warrant Stock is required to be delivered under the Securities Act, any
event with respect to the Company shall have occurred as a result of which any
such prospectus or any other prospectus as then in effect would include an
untrue statement of a material fact or omit to state any material fact necessary
to make the statements therein not misleading; and, prepare and file with the
Commission, promptly upon the Selling Shareholder(s)' written request, any
amendments or supplements to such Registration Statement or prospectus which may
be reasonably necessary or advisable in connection with the distribution of the
Warrant Stock;

                (e)     Prepare promptly upon request of the Selling
Shareholder(s) or any underwriters for the Selling Shareholder(s) such amendment
or amendments to such Registration Statement and such prospectus or prospectuses
as may be reasonably necessary to permit compliance with the requirements of
Section 10 (a) (3) of the Securities Act;

                (f)     Advise the Selling Shareholders promptly after the
Company shall receive notice or obtain knowledge of the issuance of any stop
order by the Commission suspending the effectiveness of any such Registration
Statement or amendment thereto or of the initiation or threatening of any
proceeding for that purpose, and promptly use its best efforts to prevent the
issuance of any stop order or obtain its withdrawal promptly if such stop order
would be issued;

                (g)     Use its best efforts to qualify as soon as reasonably
practicable the Warrant Stock for sale under the securities or blue-sky laws of
such states and jurisdictions within the United States as shall be reasonably
requested by the Selling Shareholder(s); provided that the Company shall not be
required in connection therewith or as a condition thereto to qualify to do
business, to become subject to taxation or to file a consent to service of
process generally in any of the aforesaid states or jurisdiction;

                (h)     Furnish the Selling Shareholder(s), as soon as
available, copies of any Registration Statement and each preliminary or final
prospectus, or supplement or amendment required to be prepared pursuant thereto,
all in such quantities as the Selling Shareholder(s) may from time to time
reasonably request, and;

                (i)     If requested by the Selling Shareholder(s), enter into
an agreement with the underwriters of the Warrant Stock being registered
containing customary provisions and reflecting the foregoing.

        15.     INCIDENTAL REGISTRATION. Other than as covered in paragraph 13
hereof, if at any time the

                                      -9-
<PAGE>

Company subsequent to the next public offering of registered Common Shares of
the Company, shall propose the filing of a Registration Statement on an
appropriate form under the Securities Act for the registration of any securities
of the Company, other than a registration statement on Form S-4 or S-8 or any
equivalent form of registration statement then in effect, then the Company shall
give the Holder(s) notice of such proposed registration and shall include in any
Registration Statement relating to such securities all or a portion of the
Warrant Stock then owned or to be owned by such Holder(s), which such Holder(s)
shall request (such Holder(s) to be considered "Selling Shareholder(s)"), by
notice given by such Selling Shareholder(s) to the Company within fifteen (15)
business days after the giving of such notice by the Company, within fifteen
(15) business days after the giving of such notice by the Company, to be so
included. In the event of the inclusion of Warrant Stock pursuant to this
paragraph 15, the Company shall bear the Costs and Expenses of such
registration; provided, however that the Selling Shareholder(s) shall pay the
fees and disbursements of their own counsel and, pro-rata based upon the number
of shares of Warrant Stock included therein as these relate to the total number
of Common Shares to be offered or sold, the Securities Act registration fees and
underwriters' discounts and compensation attributable to the inclusion of such
Warrant Stock; and, provided further, however, that amounts to which any person
or entity shall become entitled pursuant to this sentence shall not include
amounts which may become payable pursuant to paragraphs 16 or 17 hereof. Nothing
in this paragraph 15 shall require the registration of Warrant Stock in a
Registration Statement relating solely to (a) securities to be issued by the
Company in connection with the acquisition of the stock or the assets of another
corporation, or the merger or consolidation of any other corporation by or with
the Company or any of its subsidiaries, or an exchange offer with any
corporation, (b) securities to be offered to the then existing security holders
of the Company, or (c) securities to be offered to employees of the Company. In
the event the distribution of securities of the Company covered by a
Registration Statement referred to in this paragraph 15 is to be underwritten,
then the Company's obligation to include Warrant Stock in such a Registration
Statement shall be subject, at the option of the Company, to the following
further conditions:

                (a)     The distribution for the account of the Selling
Shareholders shall be underwritten by the same underwriters who are underwriting
the distribution of the securities for the account of the Company and/or any
other persons whose securities are covered by such Registration Statement and
the Selling Shareholder(s) shall enter into an agreement with such underwriters
containing customary provisions.

                (b)     If the Selling Shareholders are included in the
Registration Statement and if the underwriting agreement entered into with the
aforesaid underwriters contains restrictions upon the sale of securities of the
Company, other than the securities which are to be included in the proposed
distribution, for a period not exceeding ninety (90) days from the effective
date of the Registration Statement, then such restrictions shall be binding upon
the Selling Shareholder(s) with respect to any Warrant Stock not covered by the
Registration Statement and, if requested by the underwriter, the Selling
Shareholder(s) shall enter into a written agreement to that effect.

                (c)     If the underwriters shall state in writing that they are
unwilling to include any or all of the Selling Shareholder(s)' Warrant Stock in
the proposed underwriting because such inclusion would

                                      -10-
<PAGE>

materially interfere with the orderly sale and distribution of the securities
being offered by the Company, then the number of the Selling Shareholder(s)'
shares of Warrant Stock to be included shall be reduced pro rata on the basis of
the number of shares of Warrant Stock originally requested to be included by
such Selling Shareholder(s), or there shall be no inclusion of the shares of the
Selling Shareholder(s) in the Registration Statement not proposed distribution,
in accordance with such statement by the underwriters.

However, if in such an event, the Holder(s) hereof shall not be able to include
at least fifty percent (50%) of the Warrant Stock originally requested to be
included, then the Company shall agree to pay all of the Costs and Expenses of a
Shelf Registration to be filed at a later date.

In the event that any Holder's Warrant Shares previously have been registered
under the Securities Act, then this paragraph 15 shall not be applicable to such
previously registered shares.

        16.     INDEMNIFICATION BY THE COMPANY. The Company shall indemnify and
hold harmless each Selling Shareholder, any underwriter (as defined in the
Securities Act) for the Selling Shareholder, and each person, if any, who
controls the Selling Shareholder or such underwriter within the meaning of the
Securities Act (but, in the case of an underwriter or a controlling person, only
if such under writer or controlling person indemnifies the persons mentioned in
paragraph 17(b) hereof in the manner set forth therein) against any losses,
claims, damages or liabilities, joint or several, to which the Selling
Shareholder or any such underwriter or controlling person becomes subject, under
the Securities Act or otherwise, insofar as such losses, claims, damages or
liabilities (or actions in respect thereof) are caused by any untrue statement
or alleged untrue statement of any material fact contained in any preliminary
prospectus (if used prior to the effective date of the Registration Statement),
or contained, on the effective date thereof, in any Registration Statement under
which the Selling Shareholder(s)' shares of Warrant Stock were registered under
the Securities Act, the prospectus contained therein, or any amendment or
supplement thereto, arising out of or based upon the omission or alleged
omission to state therein a material fact required to be stated therein or
necessary to make the statements therein not misleading; the Company shall
reimburse the Selling Shareholder, or any such underwriter or controlling
person, in connection with investigating or defending any such loss, claim,
damage, liability or action; provided, however, that the Company shall not be
liable to any such person in any such case to the extent that any such loss,
claim, damage, liability or action arises out of or is based upon any untrue
statement or alleged untrue statement or omission or alleged omission made in
reliance upon and in conformity with information furnished in writing to the
Company by such person expressly for inclusion in any of the foregoing
documents.

        17.     INDEMNIFICATION BY SELLING SHAREHOLDERS. Each individual Selling
Shareholder shall:

                (a)     Furnish to the Company in writing all information
concerning it and its holdings of securities of the Company as shall be required
in connection with the preparation and filing of any Registration Statement
covering any Shares of Warrant Stock.

                                      -11-
<PAGE>

                (b)     Indemnify and hold harmless the Company, each of its
directors, each of its officers who has signed a Registration Statement, each
person, if any, who controls the Company within the meaning of the Securities
Act and any underwriter (as defined in the Securities Act) for the Company,
against any losses, claims, damages or liabilities to which any such director,
officer, controlling person or underwriter may become subject under the
Securities Act or otherwise, insofar as such losses, claims, damages, or
liabilities (or actions in respect therefor) are caused by any untrue statement
of any material fact contained in any preliminary prospectus (if used prior to
the effective date of the Registration Statement) or contained, on the effective
date thereof, in any Registration Statement under which the Selling
Shareholder's securities were registered under the Securities Act, the
prospectus contained therein, or any amendment or supplement thereto, or arising
out of or based upon the omission to state therein a material fact required to
be stated therein or necessary to make the statement therein not misleading; in
each case to the extent, but only to the extent, that such untrue statement or
omission was made in reliance upon and in conformity with information furnished
to the Company in writing by the Selling Shareholder expressly for inclusion in
any of the foregoing documents, and the Selling Shareholder shall reimburse the
Company and any such director, officer, controlling person or underwriter for
any legal or other expenses reasonably incurred by the Company or any such
director, officer, controlling person or underwriter in connection with
investigating or defending any such loss, claim, damage, liability or action.

        18.     NOTIFICATION BY SELLING SHAREHOLDERS. The Selling Shareholder(s)
and each other person indemnified pursuant to paragraph 16 hereof shall, in the
event it receives notice of the commencement of any action against it which is
based upon an alleged act or omission which, if proven, would result in the
Company having to indemnify it pursuant to paragraph 16 hereof, promptly notify
the Company, in writing, of the commencement of such action and permit the
Company, if the Company so notifies the Selling Shareholder(s) within ten (10)
days after receipt by the Company of notice of the commencement of the action,
to participate in and to assume the defense of such action with counsel
reasonably satisfactory to the Selling Shareholder(s) or such other indemnified
person, as the case may be. The omission to notify the Company promptly of the
commencement of any such action shall not relieve the Company of any liability
to indemnify the Selling Shareholder(s) or such other indemnified person, as the
case may be, under paragraph 16 hereof, except to the extent that the Company
shall suffer any loss by reason of such failure to give notice which it may have
pursuant to the rights conveyed to the Holders) in this Warrant.

        19.     NOTIFICATION BY THE COMPANY TO SELLING SHAREHOLDERS. The Company
agrees that, in the event it receives notice of the commencement of any action
against it which is based upon an alleged act or omission which, if proven,
would result in a Selling Shareholder having to indemnify the Company pursuant
to paragraph 17(b) hereof, the Company will promptly notify the Selling
Shareholder in writing of the commencement of such action and permit the Selling
Shareholder, if the Selling Shareholder so notifies the Company within ten (10)
days after receipt by the Selling Shareholder of notice of the commencement of
the action, to participate in and assume the defense of such action with counsel
reasonably satisfactory to the Company. The omission to notify the Selling
Shareholder promptly of the commencement of any such action shall not relieve
the Selling Shareholder of liability to indemnify the Company under paragraph
17(b) hereof,

                                      -12-
<PAGE>

except to the extent that the Selling Shareholder shall suffer any loss by
reason of such failure to give notice, and shall not relieve the Selling
Shareholder of any other liabilities which it may have under this or any other
agreement then in effect between the Company and the Selling Shareholder.

        20.     COSTS AND EXPENSES. As used in this Warrant, "Costs and
Expenses" shall include all of the costs and expenses relating to the respective
Registration Statement(s) involved, including but not limited to, registration
fees, filing and qualification fees, blue-sky expenses, printing and mailing
expenses, fees and expenses of Company's counsel and, if/when appropriate, fees
and expenses of counsel designated by the Selling Shareholder(s) (provided,
however, that no more than one such counsel for the Selling Shareholder(s) shall
be designated on any occasion).

        21.     ADDRESSES. All notices, certificates, waiver and other
communications required or permitted to be given hereunder to any of the parties
by any other party shall be in writing and shall be delivered personally or sent
by next day delivery service or registered or certified mail, postage prepaid,
as follows:

                (a)     If to the Company, addressed to:
                             Celsion Corporation
                             10220-I Old Columbia Road
                             Columbia, MD 21046-1705

                             Attention: Mr. John Mon, Corporate Secretary

                (b)     If to a Holder, addressed to the address of each such
                        Holder as shall, from time to time, appear on the
                        records of the Company or those of the Company's
                        transfer agent as may be the case.

Except as otherwise specifically provided herein, any notice delivered
personally or sent by next day delivery service shall be deemed to have been
given on the date so delivered, and any notice delivered by registered or
certified mail shall be deemed to have been given on the date it is received.
Any party may change the address to which notices hereunder are to be sent by
giving written notice of such change of address in the manner provided for
giving notice.

        22.     WAIVER. No waiver by a Holder of any right hereunder shall be
effective unless it is in a writing which specifically refers to the provision
hereof under which such right arises, and no such waiver shall operate or be
construed as a waiver of any subsequent breach, whether of a similar or
dissimilar nature.

        23.     ENTIRE WARRANT. This Warrant may be amended, supplemented or
modified only by a written instrument executed by the Company and the Holder(s).
While separate executed letters proposing and/or accepting amendment(s) sent to
the Company by the Holder(s) or to the Holder(s) by the Company shall, for the
purposes of this paragraph 23, constitute a valid agreement as to the
relationship then created by and

                                      -13-
<PAGE>

between the Company and the individual Holder in question, only [Riker] (as the
original Holder) may, by agreement with the Company, bind all subsequent Holders
to one single written instrument which shall serve to amend the terms and
conditions hereof, and to which by their acceptance of an assignment of any
portion of this Warrant, they implicitly agree to be bound.

        24.     APPLICABLE LAW. This Warrant and the legal relations among the
parties hereto shall be governed by and construed in accordance with the
substantive laws of the State of Illinois applicable to contracts made and to be
performed therein without giving effect to the principles of conflict of laws
thereof.

        25.     APPRAISAL RIGHTS. In the event that the Company's board of
directors has not approved and the Company has not executed the next public
offering of the Company's Common Stock prior to the second anniversary of the
issuance of this Warrant, a majority in interest of the Holder(s) may, in their
sole discretion and at any time thereafter, give notice to the Company that they
wish to avail themselves of Appraisal Rights rather than force the Company into
filing a Registration Statement against its will by demanding registration
hereunder.

Should this event occur, the Company and the Holder(s) shall meet together to
appraise the value of the Warrant(s) and shall proceed to do so in the same
fashion and spirit as is provided for in the first paragraph of paragraph 10
hereof in determining a Retirement Fee to be paid the Holders upon termination
of the Warrant(s).

        26.     BINDING EFFECT. The provisions contained in this Warrant shall
be binding upon and inure to the benefit of the Company and the Holders and
their respective successors, permitted assigns, heirs and legal representatives.
Any person to whom all or a part of a Holder's rights and obligations hereunder
are assigned shall fulfill such of the assigning Holder's obligations hereunder
as have been assigned, and shall be entitled to all of the rights and benefits
hereunder to the extent that such person has assumed such Holder's obligations.
The rights and powers of each successive Holder hereunder are granted to such
Holder as an owner of Warrants or Warrant Stock as the case may be. Any
subsequent Holder whether becoming such by transfer, assignment, operation of
law or otherwise, shall have the same rights and powers which a Holder owning
the same number of Warrants and/or Warrant Stock has hereunder, and shall be
entitled to exercise such rights and powers until such Holder or subsequent
Holder no longer owns any Warrants or Warrant Stock. Except as provided in this
paragraph 26, this Warrant does not create, and shall not be construed as
creating, any rights enforceable by any person not a Holder.

        27.     VALIDITY. If any term, provision, covenant or restriction of
this Warrant is held by a court of competent jurisdiction to be invalid, void or
unenforceable, the Company agrees that such term, provision, covenant or
restriction shall be reformed to the extent possible consistent with such
judicial holding to reflect the intent of the Company and the original Holder as
stated herein and the remainder of the terms, provisions, covenants and
restrictions of this Warrant shall remain in full force and effect and shall in
no way be affected, impaired or invalidated. It is hereby stipulated and
declared to be the intention of the Company

                                      -14-
<PAGE>

that it would have executed this Warrant including the remaining terms,
provisions, covenants and restrictions without including any of such provision
of term which may be hereafter declared invalid, void or unenforceable.

        28.     NATURE OF WARRANT. This Warrant is issued in substitution,
exchange and replacement of that certain Warrant, Serial No. ________________
originally granted to the holder on May 29, 1996 (the "Original Warrant")
pursuant to that certain Settlement Agreement dated as of [January 25, 2002]
(the "Settlement Agreement"). The parties acknowledge and agree that the
surrendered Original Warrant is of the same or greater amount than this Warrant.
The issuance of this Warrant shall satisfy the Company's obligations with
respect to replacement of the Original Warrant under the Settlement Agreement
and, upon issuance of this Warrant, the Original Warrant shall be null and void
and of no further force or effect, provided that, if it is determined that such
exchange does not qualify as a tax-free reorganization under Section
368(a)(1)(F) of the Internal Revenue Code, the Original Warrants shall be deemed
to be amended to reflect the terms of the Replacement Warrants.

This Warrant (Serial Number: _________) is granted and sold on the date first
above written.

                                             Celsion Corporation

                                             By:
                                                ------------------------------
                                                Augustine Y. Cheung
                                                President

Attest:

John Mon

Secretary

                                      -15-
<PAGE>

PURCHASE FORM

                           Dated: __________

Celsion Corporation
10220-1 Old Columbia Road
Columbia, MD 21046-1705

Attention: Mr. John Mon, Corporate Secretary

Attached herewith is Celsion Corporation's Common Stock Purchase Warrant, Serial
Number: __________ (the "Warrant"), giving the Holder the right to purchase
__________ shares of Celsion Corporation Common Stock.

I/We hereby notify you that I/we am/are exercising my/our right to purchase
__________ shares pursuant to the Warrant and have enclosed herewith my/our
check in the amount of $__________, representing the aggregate exercise price of
said shares. If transfer taxes (federal or state) are applicable to this
transaction, I/we understand that you will be billing me/us for said taxes,
which I/we agree will be promptly remitted to you within ten (10) days of my/our
receipt of notification.

I/We hereby state that the shares being purchased are to be held by me/us for
investment purposes and not with a view to sale, except pursuant to an effective
registration statement pursuant to the Securities Act of 1933, as amended, or an
exemption therefrom the registration requirements of such Securities Act.

Please cancel the enclosed Warrant and, if applicable, send me/us a Warrant, in
partial substitution on identical terms, for the remaining shares not being
purchased pursuant to this notification and as to which the Warrant has not
heretofore been exercised.

Yours very truly,

Holder of Warrant, Serial Number __________

                                      -16-

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