Exhibit 10.5

                     PRACTICE MANAGEMENT SERVICES AGREEMENT

                                 BY AND BETWEEN

                         MITCHELL E. LEVINE, M.D., P.C.

                                       AND

                      MOLECULAR RADIATION MANAGEMENT, INC.

                           DATED AS OF JANUARY 1, 2000

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                                Table of Contents

                                                                            Page
                                                                            ----

I.  RECITALS.................................................................1

II.  AGREEMENT...............................................................1

  1.  COMPREHENSIVE PRACTICE MANAGEMENT SERVICES.............................1
    1.1   Treatment Space....................................................2
    1.2   Furnishings and Equipment..........................................3
    1.3   Supplies...........................................................5
    1.4   Personnel Services.................................................5
    1.5   Managerial and Administrative Services.............................6
  2.  LICENSING OF NAME AND PATENTS..........................................6
  3.  CONSULTING AND MANAGEMENT SERVICES.....................................7
  4.  BILLING AND COLLECTION SERVICES........................................8
  5.  WORKING CAPITAL ADVANCE................................................9
  6.  COMPENSATION..........................................................10
  7.  REPRESENTATIONS, WARRANTIES AND COVENANTS OF THE P.C..................11
  8.  REPRESENTATIONS, WARRANTIES AND COVENANTS OF THE COMPANY..............13
  9.  TERM..................................................................14
  10.   TERMINATION BY THE COMPANY..........................................15
  11.   DAMAGES.............................................................16
  12.   RIGHTS UPON TERMINATION.............................................16
  13.   SECURITY INTEREST...................................................17
  14.   MEDICAL RECORDS.....................................................19
  15.   FISCAL MATTERS......................................................19
  16.   INDEPENDENT CONTRACTOR RELATIONSHIP.................................19
  17.   INTENT OF THE PARTIES: CHANGE IN LAW................................20
  18.   RESPONSIBILITIES OF THE P.C.........................................20
  19.   CONFIDENTIALITY / NON-SOLICITATION / NON-DISCLOSURE.................21
  20.   INDEMNIFICATION.....................................................22
  21.   NON-COMPETITION AND RESTRICTIVE COVENANT............................23
  22.   FORCE MAJEURE.......................................................24
  23.   REMEDIES OF THE P.C.................................................24
  24.   ENTIRE AGREEMENT....................................................25
  25.   COMPANY'S OPTION TO PURCHASE........................................25
  26.   MODIFICATION........................................................26
  27.   WAIVER..............................................................26
  28.   ASSIGNMENT..........................................................26
  29.   SUCCESSORS AND ASSIGNS..............................................27
  30.   EFFECT OF INVALIDITY................................................27
  31.   NOTICES.............................................................27
  32.   FURTHER ACTIONS.....................................................28
  33.   PARAGRAPH CAPTIONS..................................................28
  34.   COUNTERPARTS........................................................28
  35.   GOVERNING LAW.......................................................29


                                      -i-
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                     PRACTICE MANAGEMENT SERVICES AGREEMENT

      THIS PRACTICE MANAGEMENT SERVICES AGREEMENT (the "Agreement"), is made and
entered into as of January 1, 2000, by and between MITCHELL E. LEVINE, M.D.,
P.C., a professional corporation organized under the laws of the State of New
York (the "P.C.") having its principal of business at 700 Stewart Avenue, Garden
City, New York 11530 and MOLECULAR RADIATION MANAGEMENT, INC., a New York
corporation (the "Company"), at 700 Stewart Avenue, Garden City, New York 11530.

                                   I. RECITALS

      WHEREAS, the Company wishes to provide comprehensive medical practice
management services, including the leasing or subleasing of space and equipment,
consulting, billing, collection and related services (collectively, the
"Practice Management Services") and financial services to the P.C.;

      WHEREAS, the P.C. is engaged in the practice of medicine in the specialty
of neurological surgery; and

      WHEREAS, the P.C. desires that the Company provide Practice Management
Services and financial services to the P.C.; and

      WHEREAS, the P.C. and the Company wish to set forth, as of the date
hereof, their respective rights and obligations as they relate to the provision
of such Practice Management Services and financial services.

      NOW, THEREFORE, in consideration of mutual covenants and other good and
valuable consideration contained herein, the parties agree as follows:

                                  II. AGREEMENT

      1. COMPREHENSIVE PRACTICE MANAGEMENT SERVICES

      During the term of this Agreement, the Company will provide to the P.C. a
comprehensive range of non-medical Practice Management Services, all as
described in this Agreement, which the parties agree are sufficient to enable
the P.C. to conduct its medical practice (hereinafter the "P.C.'s Practice") and
the P.C. shall retain the Company on an exclusive basis (exclusive as to the
P.C. itself as
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well as to any other person or entity related to or affiliated with the P.C.) to
provide such services. For purposes of clarification, it is understood that all
services, of any nature whatsoever including, without limitation, the providing
of clerical, managerial, technological, consulting, billing, collections and
receivable processing services, that are to be provided by the Company to the
P.C., whether or not specifically described in this Agreement, shall not include
services which relate to the providing of medical services.

      1.1 Treatment Space

      (a) The Company will obtain for use by the P.C., space in a clinical or
hospital department, and/or establish a site equipped as set forth in Paragraph
1.2, for the private practice of medicine, and, in particular, for the practice
of neurological surgical / neuro-oncology. Such practice will include the
utilization of the Patents and Technology (as such terms are defined in
Paragraph 2 hereof). Such space shall be reasonably satisfactory to the P.C. and
is referred to herein as the "Treatment Space".

      (b) To the extent that the Treatment Space, or any space which Company may
provide to the P.C. in the future, is available to the Company as owner, lessee,
sub-lessee, licensee or assignee (all such space being hereinafter called
"Licensed Space"), all of the obligations contained in each such lease, sublease
or assignment (an "Overlease") which are imposed upon the Company will be
assumed by the P.C.

      (c) The P.C. covenants to fully and faithfully perform the terms and
conditions of any Overlease and this Agreement. The P.C. shall not do or cause
to be done or suffer or permit any act to be done which would or might cause any
of the Overlease or the rights of the Company, as owner, lessee, sub-lessee,
licensee or assignee, as the case may be, under such Overlease, to be
endangered, canceled, terminated, forfeited, amended, modified or surrendered,
or which would or might cause the Company to be in default thereunder or liable
for any damage, claim or penalty.

      (d) The Company shall have no obligation to take any action to enforce or
compel performance by any of its landlords and/or lessors and/or assignors of
any provision of any Overlease or other agreement and the Company shall not be
liable to the P.C. in the event of its landlords' or lessors' or assignors'
default or failure to perform any obligations.

      (e) If there is any conflict between any provision of the Overlease and
the provisions of this Agreement, which would permit the P.C. to do or cause to
be done or suffer or permit any act or thing to


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be done which is prohibited by any provision of the Overlease, then the
provisions of the respective Overlease shall prevail.

      (f) Upon the termination of an Overlease, the Company will either (i)
advise the P.C. that it will not provide space to the P.C., in which event that
P.C. shall be free to enter into such leases for space as it, in its sole
discretion, shall determine or (ii) advise the P.C. that it will provide space
to the P.C. in which event the Company will either provide the P.C. with the
space now provided under an Overlease or select and provide to the P.C.
comparable Licensed Space at a comparable location.

      (g) The Company's provision of Licensed Space to the P.C. shall include:

            (i)   electricity and water;

            (ii)  heat or air conditioning, during the appropriate seasons, in
                  conformity with any local, state or federal regulations; and

            (iii) janitorial services as is customary in the location of each
                  such Licensed Space.

      1.2 Furnishings and Equipment

      (a) The Company will arrange for the furnishing of the Treatment Space
with furniture and fixtures that are customary for such spaces' intended uses,
as more fully described in a Furnishings Schedule annexed hereto as the same may
hereafter be amended from time to time (the "Furnishings").

      (b) The Furnishings provided by the Company shall remain at all times the
property of the Company, whether owned or leased by the Company, and the P.C.
shall not pledge, lend, create a security interest in, assign, sublease or part
with possession of the Furnishings or any part thereof or attempt in any other
manner to alter, modify, depose of the Furnishings or remove the Furnishings or
any part thereof from the Treatment Space, without the Company's prior written
consent, or take any other action which would adversely affect the Company's
title to or interest in the Furnishings. The P.C. will promptly discharge, at
its own expense, any lien or encumbrance on the Furnishings that shall arise,
unless same shall have been created by the Company. The P.C. shall sign a
Uniform Commercial Code ("UCC") Form 1 Financing Statement and any applicable
future continuation statements to reflect that the Furnishings are the property
of the Company, and authorizes the Company to file such statements without its
signature.

      (c) The Company will provide the P.C. at the Treatment Space or other site
with the use of equipment reasonably necessary for the use and continued
development of the Patents and Technology


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(as such terms are defined in Paragraph 2 hereof), as more fully described in an
Equipment Schedule annexed hereto as the same may hereafter be amended from time
to time (the "Equipment"). The Equipment Schedule indicates all equipment that
is attached to the real property where the Treatment Space is located.

      (d) The Equipment provided by the Company to the P.C. at the Treatment
Space or other site shall remain at all times the property of the Company even
if installed in or attached to real property and whether owned or leased by the
Company. The P.C. shall not pledge, lend, create a security interest in, assign,
sublease or part with possession of, the Equipment or any part thereof or
attempt in any other manner to alter, modify, dispose of or remove the Equipment
or any part thereof from the Treatment Space or any other site, without the
Company's prior written consent, or take any other action which would adversely
affect the Company's title to or interest in the Equipment. The P.C. shall
promptly discharge, at its own expense, any lien or encumbrance on the Equipment
that shall arise, unless the Company shall have created the same. The P.C.
agrees to sign a Form UCC-l Financing Statement and any applicable future
continuation statements to reflect that the Equipment is the property of the
Company.

      (e) The P.C. shall cause the Equipment to be operated in accordance with
any applicable manufacturer's manual of instructions and only by competent and
qualified personnel. The Company shall provide the P.C. with copies of any
manufacturer instructions, which it may have in its possession in connection
with any of the Equipment.

      (f) THE COMPANY HEREBY DISCLAIMS ANY REPRESENTATIONS OR WARRANTIES WITH
RESPECT TO THE EQUIPMENT, AND THE FURNISHINGS, EXPRESS, IMPLIED OR OTHERWISE,
INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

      (g) The P.C. agrees to use the Furnishings and Equipment only for the
purposes described in this Agreement and in accordance with applicable laws,
regulations and manufacturers instructions.

      (h) The Company shall be responsible, at its expense, to repair and/or
maintain the Furnishings and Equipment except for repairs caused by the willful
misconduct, negligence or misuse of the Furnishings or Equipment by the P.C. or
its agents or subcontractors. All such repairs and maintenance shall be provided
by the Company, by its own employees, agents or subcontractors, upon the request
of the P.C.


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      1.3 Supplies

      The Company will provide the P.C. with such medical and office supplies
(hereinafter the "Supplies") that are reasonably necessary for the day-to-day
operation of the P.C. including, specifically,

            i.    isotopes, radio-labeled pharmaceuticals and macro-aggregated
                  proteins used in connection with the Patents and Technology
                  (as such terms are defined in Paragraph 2 hereof), which
                  presently are supplied to the Company by Mallinckrodt Medical,
                  Inc. and Iso-Tex, Inc., (although the Company reserves the
                  right, at its election, to obtain such isotopes, radio-labeled
                  pharmaceuticals and macro-aggregated proteins from other
                  sources); and

            ii.   any such other supplies as may be reasonably acceptable to the
                  P.C. (i. - ii. collectively, the "Pharmaceuticals").

      1.4 Personnel Services

      (a) The Company will provide to the P.C., on a non-exclusive basis,
personnel and other non-medical personnel such as, for example, secretaries,
receptionists, file clerks, administrators, etc. ("Non-Medical Personnel") as
may be reasonably required to perform necessary services for the P.C.

      (b) Non-Medical Personnel will be selected and assigned to the P.C. on an
as-needed basis as reasonably agreed to by the parties.

      (c) The Company will be responsible for the salary, withholding taxes,
compensation insurance, disability insurance, medical/health insurance and other
fringe benefits of the Non-Medical Personnel provided by the Company to the P.C.

      (d) The P.C. acknowledges that since the Non-Medical Personnel provided by
the Company to the P.C. under this Agreement are provided on a non-exclusive
basis, such Non-Medical Personnel may, from time to time, perform services for
other clients of the Company. Nothing in this Agreement, express or implied,
shall prevent the Company from providing the services of such personnel to its
other present or future clients or using them for its own purposes.


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      (e) The Company will not provide Non-Medical Personnel on the holidays
listed below, and also reserves the right to modify or substitute the list of
holidays on which services will not be provided:

            1.    New Year's Day                6.    Independence Day
            2.    Martin Luther King Day        7.    Labor Day
            3.    President's Day         `     8.    Yom Kippur
            4.    Good Friday                   9.    Thanksgiving Day
            5.    Memorial Day                 10.    Christmas Day

      Should the P.C. require Non-Medical Personnel on any of the holidays set
forth above, it shall notify the Company in writing not less than seven (7)
business days in advance of the P.C.'s clerical needs. In such event, the
Company will use its best efforts to supply holiday Non-Medical Personnel as
requested by the P.C.

      1.5 Managerial and Administrative Services

      Unless otherwise set forth in this Agreement, the Company will provide all
non-medical managerial and administrative services as may be reasonably required
by the P.C. such as, for example, office administrative services, general
administrative services and fiscal management services.

      2. LICENSING OF NAME AND PATENTS

      (a) The Company hereby grants to the P.C. the nonexclusive right, license
and privilege to use the Company's logo, if any, and the trade name "Molecular
Radiation" (the "Trade Name") for the P.C.'s use in connection with the
development of its treatment protocols.

      (b) The Company hereby licenses to the P.C. the following patents and
patents pending (the "Patents"):

            i.    Method of Treating Solid Tumor Cancers Utilizing Macro
                  Aggregated Proteins and Colloidal Radioactive Phosphorous,
                  covered by United States Patent No. 5,424,288, issued June 13,
                  1995;

            ii.   Method and Compositions for Delivering Cytotoxic Agents to
                  Cancer, covered by United States Patent No. 5,538,726, issued
                  July 23, 1996; and


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            iii.  Radioactive Cisplatin in the Treatment of Cancer, U.S. patent
                  pending, Application Serial No. 09/272,549, date filed March
                  19, 1999.

      (c) In addition to the Patents, the Company hereby licenses to the P.C.
all related know how, procedures and technology (collectively, the
"Technology"), which Patents and Technology have been assigned to the Company
through separate agreements by and between Stanley E. Order, M.D. and the
Company.

      (d) The Company may include the name of the P.C. and/or any of its
physicians on any letterhead, professional announcements, brochures, promotional
materials, internet websites, email, private placements, public offerings and
the like, relating to the P.C. or to the Company.

      (e) The Company is and shall be the sole owner and holder of all right,
title and interest to its patents, copyrights, services marks and trademark
rights and interests in the management, information, logo, and other systems,
forms, form contracts, policy manuals and public relations material, all of
which shall be deemed proprietary property of the Company.

      3. CONSULTING AND MANAGEMENT SERVICES

      3.1 The Company shall provide to the P.C. some or all of the following
services ("Consulting Services"), as may specifically be agreed to from time to
time by the parties:

      (a) review and analysis of available health insurance plans with special
emphasis on managed care / self insurance plans (hereinafter "Managed Care")
which can utilize the services of the P.C., and interface on behalf of the P.C.
with such plans;

      (b) preparation of the P.C.'s applications to the Managed Care and
Indemnity payers;

      (c) consultation with the P.C. regarding the fees the P.C. should accept
from managed Care, Indemnity and capitate payers; and, subject to the P.C.'s
approval, negotiation of such reimbursement rates;

      (d) assistance to the P.C. in negotiation of Managed Care and Indemnity
Provider Agreements;

      (e) assistance to the P.C. in evaluating and developing areas in which the
P.C. can expand the P.C.'s Practice;

      (f) evaluation of new technologies, methods and equipment;

      (g) assistance in developing Quality Assurance and Utilization Review
programs;


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      (h) business advice in connection with the expansion of the P.C. into new
and expanded service areas or new medical subspecialties;

      (i) development of educational programs, including, but not limited to,
the formulation and production of seminars and/or lectures;

      (j) consultation with the P.C. concerning the feasibility/profitability of
establishing new facilities for the P.C. and assistance in (i) identifying
suitable locations; (ii) negotiating purchase contracts or leases (although such
assistance shall not consist of legal advice or representation); (iii)
supervising renovations/constructions; and (iv) integrating new facilities into
the P.C.' s operation;

      (k) consultation with the P.C. regarding practice acquisition targets
including (i) identification of medical practices available for purchase; (ii)
due diligence reviews;. (iii) negotiation of the purchase contract (although
such assistance shall not consist of legal advice or representation); and (iv)
assistance in the integration of the acquired practice;

      (l) production of strategic business plans for the P.C.;

      (m) assistance in the development of community service programs; and

      (n) assistance in the development of an internet website, and/or placement
on an existing internet website, of public information regarding the P.C.,
including, but not limited to, its treatment protocols and physician
biographies.

      4. BILLING AND COLLECTION SERVICES

      4.1 The Company will provide the P.C. with billing and collection services
for all medical services rendered by the P.C.

      (a) The P.C. agrees that during the term of this Agreement, it will
provide the Company, on an exclusive basis, with billing and collection
information relevant to all claims and/or billings for all medical services
rendered by the P.C. (the "Claims").

      (b) The Company will be responsible for the processing of all Claims in
connection with the P.C.'s Practice. Where appropriate, the Company shall
establish internal procedures to be used by the P.C. for the purpose of assuring
the accurate and timely gathering of billable information.

      (c) The Company shall, consistent with industry practices, render bills on
behalf of the P.C. and thereafter seek to collect said accounts, exercising due
care, skill and ability. The Company will also bill and use appropriate efforts
to collect all patient deductibles and co-payment amounts.


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      (d) The Company shall maintain accurate records of all transactions, which
will be available during normal business hours for inspection by the P.C. or its
duly authorized representative upon reasonable notice to the Company.

      (e) The Company shall at all times conform with all applicable federal,
state and local laws, rules and regulations and shall modify its service in the
event of any change in such laws, rules and regulations.

      (f) The Company shall keep all information obtained from the P.C.
concerning identifiable patients and their diagnosis/treatment/evaluation
confidential except for disclosures required for billing purposes or where
required by law or subpoena.

      (g) All claims submitted by the Company will be in the name of the P.C.
The P.C. agrees that remittances and all other proceeds of accounts receivable
generated by the P.C. shall be remitted to the Company's administrative offices,
at 700 Stewart Avenue, Garden City, New York 11530, on behalf of the P.C. or to
such other address as the parties may hereafter agree upon. All monies and
instruments collected by the Company on behalf of the P.C. will be deposited
into the P.C.'s segregated operating account (the "Segregated Account"); and in
connection therewith, the P.C. hereby authorizes the Company to endorse all such
checks with the P.C. name for deposit to the Segregated Account. In the event
any payment, proceed or instrument in payment of services or accounts receivable
related to the P.C.'s Practice is received directly by the P.C., the same shall
be immediately remitted to the Company for deposit into the Segregated Account.

      (h) The P.C. agrees that the Company may designate two individuals who
will have signature authority over the Segregated Account. The P.C. further
agrees that the Company may make payments on behalf of the P.C. from the
Segregated Account for obligations of the P.C., which obligations shall include
the fees to be paid to the Company pursuant to this Agreement.

      5. WORKING CAPITAL ADVANCE

      5.1 Upon written request of the P.C., the Company may, in its sole
discretion, advance monies to the P.C. for purposes of working capital (the
"Working Capital Advance").

      5.2 In the written request for the Working Capital Advance, the P.C. will
provide the Company with:


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      (a)   a statement that the proceeds of the Working Capital Advance will be
            used solely by the P.C. for its medical practice;

      (b)   a statement as to the exact use of the Working Capital Advance; and

      (c)   such financial records and reports as the Company may determine to
            be necessary in connection with its evaluation of the request of the
            Working Capital Advance.

      5.3 Upon review of a request for a Working Capital Advance and the
financial records and reports of the P.C., the Company will determine whether
and upon what terms it will approve such Working Capital Advance. The Company's
determination to make any Working Capital Advance will be based upon such
factors as it determines are reasonable and appropriate, including but not
limited to, the following: (i) the purpose of the request; (ii) the financial
condition of the P.C. at the time of the request; (iii) the prevailing economic
conditions; (iv) interest rates; (v) the availability of capital to the Company
on reasonable terms and (vi) a business plan and budget of the P.C. for the
following calendar year. If the request for the Working Capital Advance is
granted, the parties shall negotiate in good faith mutually agreeable terms for
the repayment of the Working Capital Advance and the P.C. shall execute such
documents as the Company shall reasonably require as a pre-condition to the
funding of the Working Capital Advance. If the request for a Working Capital
Advance is denied, such denial will not constitute a breach of this Agreement.
The repayment of a Working Capital Advance will be in addition to any fees due
the Company pursuant to Paragraph 6 of this Agreement.

      6. COMPENSATION

      6.1 For the services to be provided by the Company to the P.C. pursuant to
Paragraphs 1, 3 and 4 of this Agreement the P.C. will pay to the Company (a) on
a weekly basis, in arrears, an amount equal to the actual cost to the Company of
providing all such services to the P.C., which costs shall include, without
limitation, the salaries and benefits of the Non-Medical Personnel, the cost of
Supplies, the rent payable for Licensed Space if any, etc. plus (b) on a monthly
basis, in advance, $1,500.00 per month through December 31, 2000 (Such monthly
fee hereinafter called the "Initial Fee").

      6.2 The Parties agree that the Initial Fee has been determined based upon
the management services required by the current operations of the P.C. and,
therefore, the parties agree that the Initial Fee shall be subject to adjustment
prior to January 1 during the terms of this Agreement beginning on


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January 1, 2001. In contemplation thereof, the parties agree that not less than
ninety (90) days prior to the end of each calendar year during the term of this
Agreement (beginning with October 2000) the P.C. and the Company shall meet for
the purposes of agreeing upon a new fee for then current calendar year (the "New
Fee"). If the P.C. and the Company cannot agree on a New Fee, then the Initial
Fee or the New Fee, as the case may be, then being charged by the Company to the
P.C. shall be increased for the following year by the following two factors: (a)
the cost of living adjustment as determined by the U.S. Labor Department, Bureau
of Labor Statistics for All Urban Consumers for the New York Metropolitan Area
for "Medical Care" for the previous calendar year; and (b) the Company's
reasonable evaluation as to the costs associated with any increase in the time,
effort, manpower, supplies, etc., required to be provided by the Company to the
P.C.

      6.3 If the P.C. should open an additional facility, and if the P.C. and
the Company shall amend this Agreement to cover the providing of Consulting and
Management Services to the P.C. at such facility. In the absence of specific
compensation arrangements in any such amendment to the contrary, the P.C. shall
pay to the Company for the provision of such Consulting and Management Services
the actual cost to the Company for the providing of such services plus 20%.

      6.4 The parties agree that the Initial Fee and any New Fee shall be
subordinate to:

      (i)   payment of any salary or bonuses due to MITCHELL E. LEVINE, M.D.
            which payment is set forth in employment agreement, dated the date
            hereof, between MITCHELL E. LEVINE, M.D. and the P.C.,

      (ii)  payment of malpractice insurance as described in Dr. MITCHELL E.
            LEVINE's Employment Agreement, and

      (iii) payment of approved payroll for other licensed medical professionals
            employed by the P.C.

      6.5 All invoices rendered by the Company to the P.C. shall be paid within
ten (10) days of receipt thereof by the P.C.

      7. REPRESENTATIONS, WARRANTIES AND COVENANTS OF THE P.C.

      The P.C. represents, warrants and covenants to the Company that:


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      7.1 The P.C. is a professional corporation duly organized, validly
existing and in good standing under the laws of the State of New York and duly
authorized to practice medicine.

      7.2 The sole shareholder of the P.C. is MITCHELL E. LEVINE, MD (The "P.C.
Shareholder"), a physician duly licensed to practice medicine in the State of
New York, who also is certified by the American Board of Neurological Surgery.

      7.3 The execution and delivery of this Agreement by the P.C. and the
performance of its duties hereunder (a) have been duly authorized by all
necessary corporate action, and this Agreement constitutes the valid and binding
obligation of the P.C., enforceable against the P.C. in accordance with its
terms and (b) will not violate or conflict with the P.C.'s Certificate of
Incorporation or By-laws and will not result in a breach of or constitute a
default under any agreement or instrument to which the P.C. or any of its
officers, directors or shareholders may be a party or by which any of them may
be bound or affected.

      7.4 The P.C., its employees and professional subcontractors, if any,
shall, at all times during the term of this Agreement, be duly licensed as
required by the State of New York and comply with all applicable laws and
regulations relating to the operation of its medical practice.

      7.5 The P.C. shall maintain, at its sole cost and expense, medical
malpractice insurance in the minimum amount of $1 million per occurrence and $3
million in the aggregate during the term of this Agreement, or, if such
insurance is not readily available, the P.C. Shareholders shall name the P.C. on
their individual malpractice policies as an additional insured. All such
insurance shall be issued by New York-admitted carriers (i.e., carriers approved
by the New York Superintendent of Insurance to do business in this state). All
insurance shall be (i) occurrence coverage, or (ii) claims-made coverage only if
accompanied by a paid tail endorsement ensuring that such coverage shall remain
in effect even after expiration of the applicable policy period or this
Agreement. The P.C. shall provide the Company with a copy of such policy or
policies. The policy shall provide for at least thirty (30) days advance written
notice to the P.C. from the insurer of any alteration, cancellation or
termination of the foregoing coverage. In the event of receipt of such notice,
the P.C. shall immediately advise the Company of any such alteration,
cancellation or termination of malpractice coverage.

      7.6 The P.C. shall require all physicians hired or contracted by it and
who perform services for the P.C., at their own cost and expense or at the cost
and expense of the P.C., to maintain


                                    Page 12
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malpractice insurance issued by New York-admitted carriers, in the minimum
amount of $1 million per occurrence and $3 million in the aggregate. The P.C.
shall require that the malpractice policies maintained by its physicians provide
for thirty (30) days advance written notice to the P.C. from the insurer of any
alteration, cancellation or termination of the foregoing coverage. In the event
of receipt of such notice, the P.C. shall immediately advise the Company of any
such alteration, cancellation or termination of malpractice insurance.

      7.7 The P.C. shall require all health professionals, other than the
physicians, hired by the P.C. to perform services for the P.C. to maintain (at
their own cost and expense or at the cost and expense of the P.C.) professional
liability insurance issued by New York-admitted carriers, in such amounts as is
customary in the New York City area. The P.C. shall require that the
professional liability insurance policies maintained by Health Professionals
provide for thirty (30) days advance written notice to the P.C. from the insurer
of any alteration, cancellation or termination of the foregoing coverage. In the
event of receipt of such notice, the P.C. shall immediately advise the Company
of any such alteration, cancellation or termination of malpractice coverage.

      7.8 The P.C. shall maintain at its expense general casualty and liability
insurance in amounts satisfactory to the Company, which shall cover all risks of
physical loss or damage to licensed Space, Furnishings and Equipment and all
risks of liability for bodily injury and property damage resulting from the
operation of any Equipment at the Treatment Space and of damages, destruction
and loss of use of property damage from any condition of the Licensed Space. All
such Insurance shall be issued by New York-admitted carriers. The casualty and
liability insurance shall specify the Company as a named insured and provide for
thirty (30) days advance written notice to the Company from the insurer of any
alteration, cancellation or termination.

      7.9 The P.C. shall comply with all federal, state and local statutes,
regulations, intermediary carrier guidelines or other rules applicable to the
conduct of its medical practice.

      7.10 The P.C. shall have all patients assign the right of collection from
carriers and participating health care organizations, where appropriate, to the
P.C. or its agent.

      8. REPRESENTATIONS, WARRANTIES AND COVENANTS OF THE COMPANY

      The Company represents, warrants and covenants to the P.C. that:


                                    Page 13
<PAGE>

      8.1 The Company is a corporation duly organized, validly existing and in
good standing under the laws of the State of New York.

      8.2 The execution and delivery of this Agreement by the Company and the
performance of its duties hereunder: (a) have been duly authorized by all
necessary corporate action, and this Agreement constitutes the valid and binding
obligation of the Company, enforceable against the Company in accordance with
its terms and (b) will not violate or conflict with any provision of law or of
the Company's Certificate of Incorporation or By-laws and will not result in a
breach of or constitute a default under any agreement or instrument to which the
Company or any of its officers, directors or shareholders may be a party or by
which any of them may be bound or affected.

      8.3 The Company shall maintain or cause to be maintained in the name of
the Company at its expense insurance covering: (a) all risks of physical loss or
damage to the Furnishings and Equipment; (b) liability for bodily injury and
property damage arising at the Treatment Space or other site where the Company
makes available Equipment for the P.C.'s use and for damage, destruction and
loss of use of property of third parties resulting therefrom: and (c) all risks
of liability for bodily injury and property damage from any condition of the
Licensed Space with such insurance companies and in such amounts as the Company
shall deem appropriate, naming the P.C. as additional insured and furnishing the
P.C. with a Certificate of Insurance upon the P.C.'s request. All such Insurance
shall be issued by New York-admitted carriers.

      8.4 The Company shall maintain the Licensed Space, Furnishings and
Equipment in good condition and repair, reasonable wear and tear from normal use
excepted. Whenever possible, the Company shall arrange for routine maintenance,
on seven (7) days advance notice to the P.C. and at a time and manner that is
not disruptive to the P.C.'s practice, all repairs of Equipment other than those
necessitated by the P.C.'s willful misconduct or misuse of the Equipment will be
performed as soon as practicable. The Company shall arrange for emergency
repairs to be performed as promptly as practicable.

      9. TERM

      This Agreement shall be effective for a term commencing on January 1, 2000
and ending on the January 1, 2030, unless earlier terminated in accordance with
this Agreement.


                                    Page 14
<PAGE>

      10. TERMINATION BY THE COMPANY

      10.1 Notwithstanding Paragraph 9 above, the Company shall have the right,
but not the obligation to terminate this Agreement upon or following the
occurrence of any of the following events:

      (a) the failure of the P.C. to make timely payment of any Fee due the
Company as set forth herein;

      (b) the failure of the P.C. to make timely repayment of any Working
Capital Advance as set forth herein;

      (c) failure of the P.C. to maintain professional liability insurance as
provided in Paragraphs 7.5, 7.6 and 7.7 of this Agreement;

      (d) final action by the New York State Board of Regents resulting in the
revocation or suspension of the license to practice medicine in New York of any
shareholder of the P.C.;

      (e) the surrender of license to practice medicine in New York by any
shareholder of the P.C.;

      (f) the filing of criminal charges against any shareholder of the P.C.

      (g) the death of any shareholder of the P.C.;

      (h) the mental or physical disability or incapacity of any shareholder of
the P.C. which prevents the shareholders from rendering medical services to the
P.C. for a consecutive period of fifteen (15) days;

      (i) the failure of the P.C. to practice medicine for a period of 120
consecutive days;

      (j) the dissolution of the P.C.;

      (k) the bankruptcy or insolvency of the P.C.;

      (l) assignment other than as permitted by Paragraph 28.1;

      (m) material breach of this Agreement by the P.C. with such breach
continuing for thirty (30) days after written notice to the P.C. by or on behalf
of the Company stating the nature of the breach; provided, however, that if the
breach is not capable of cure within said thirty (30) day period, then the P.C.
shall have such time as is reasonably necessary to cure such breach provided
that the P.C. commences action to cure the breach within the thirty (30) day
notice period and continues diligently to attempt to cure such breach.


                                    Page 15
<PAGE>

      11. DAMAGES

      11.1 If any act described in Paragraph 10 above shall occur and if the
same shall result in the Company terminating this Agreement, the P.C. shall be
liable to the Company in an amount equal to the sum of all amounts which remain
payable by the Company for any contractual obligations which the Company
incurred or for which it may remain liable in order to meet the Company's
performance obligations under this contract.

      11.2 The shareholders of the P.C. will not be liable personally for any
obligations / damages set forth in Paragraph 11.1.

      12. RIGHTS UPON TERMINATION

      12.1 Upon termination or non-renewal of this Agreement, the P.C. shall:

      (a) quit and peacefully vacate all Licensed Space and surrender to the
Company any and all Furnishings, Equipment, Supplies or other items provided by
the Company in good order and condition (reasonable wear and tear resulting from
their proper use excluded) . Upon or at any time after any such termination or
non-renewal, the Company may, without further notice, enter upon and re-enter
all Licensed Space and possess and repossess itself thereof, by force, summary
proceedings, ejectment or otherwise, and may dispossess and remove the P.C., its
property and its personnel and all other persons and property from the Licensed
Space. The P.C. hereby expressly waives, so far as permitted by law, the service
of any notice of intention to re-enter provided for in any statute, or of the
institution of legal proceedings to that end.

      (b) cease and desist from all use of the Company's Trade Name and
Confidential Information (as hereinafter defined) in any way, and deliver to the
Company, or its duly authorized representatives, all materials and papers which
may contain the Company's Trade Name or constitute the Company's Confidential
Information.

      (c) refrain from using, without the Company's prior written consent, the
Company Trade Name, or name or any word or mark which is likely to be similar to
or confusing with the Company's Trade Name.

      12.2 The P.C. agrees that its continued use of the Trade Name, the
Patents, the Technology or the Company's Confidential Information at the
termination or expiration of this Agreement will result in


                                    Page 16
<PAGE>

immediate and irreparable damage to the Company. In this regard, the Company
shall be entitled to seek equitable relief by way of injunction and such other
relief any court with jurisdiction may deem just and proper. Additionally, the
P.C. agrees that pending such a hearing and the decision on the application for
such permanent injunctive relief, the Company shall be entitled to a temporary
restraining order, without prejudice to any other remedy available to the
Company. Furthermore, all such remedies hereunder shall be at the expense of the
P.C.

      12.3 The parties agree that subsequent to the termination of this
Agreement and until all sums due to the Company from the P.C. have been paid in
full, the Company shall be permitted to collect the P.C.'s outstanding
receivables up to the amount due and payable to the Company by the P.C. and to
apply the proceeds thereof to the payment of all sums due to the Company from
the P.C. Upon such payment in full, the Company shall terminate its security
interest in the remaining accounts receivable of the P.C.

      12.4 The provisions of this Paragraph 12 shall survive termination of this
Agreement and shall not be construed to be an exclusive remedy of the Company
and such remedy shall be held and construed to be cumulative and not exclusive
of any rights or remedies, whether in law or in equity, otherwise available
under the terms of this Agreement or under federal, state and local statutes,
rules and regulations.

      13. SECURITY INTEREST

      13.1 As security for the full and timely payment of all amounts which may
at any time and from time to time be owed by the P.C. to the Company pursuant to
this Agreement or otherwise, the P.C. hereby grants to the Company (a) a first
senior continuing security interest in all of the P.C.'s present and future
accounts, accounts receivable, contract rights and reimbursement rights (the
"General Receivables and Rights") and (b) the proceeds thereof. The General
Receivables and Rights are collectively referred to herein as the "Collateral."
In order to implement the foregoing, the P.C. agrees to sign a UCC Form 1
Financing Statement and any future updates and/or continuation statements and
also authorizes the Company to file such instruments without its signature.


                                    Page 17
<PAGE>

      13.2 The P.C. shall at all times keep the Collateral free and clear of all
liens and encumbrances except liens created by the Company's security interest
in the General Receivables and Rights.

      13.3 The P.C. shall from time to time, at the sole expense of the P.C., to
promptly execute and deliver all further instruments and documents, and take all
further action that may be necessary, or that the Company may request, in order
to perfect any security interest granted by the P.C. herein or to perfect the
Company's right in and to the accounts receivable assigned receivables. Without
limiting the generality of the foregoing, the P.C. shall execute and file such
security agreements, financing or continuation statements, or amendments
thereto, and such other instruments or notices, as may be necessary or
desirable, or as the Company may request, in order to perfect and preserve the
security interest granted herein by the P.C. to the Company to file any such
instruments without its signature.

      13.4 The occurrence of any of the events set forth in Paragraph 10 which
gives rise to the Company's right to terminate this Agreement, shall constitute
a default hereunder (a "Default"). So long as no Default has occurred, the P.C.
shall be entitled to receive all proceeds received in respect to the Collateral.
Upon the occurrence of a Default, all rights of the P.C. with the respect to the
Collateral shall cease and the Company shall have the exclusive right and
authority to receive all amounts paid in respect of the Collateral. In
connection therewith, the P.C. irrevocably authorizes the Company to notify any
or all of the P.C.'s obligees (including, but not limited to, patients and
third-party payers) to make payment directly to the Company.

      13.5 Upon Default, in addition to all rights and remedies set forth in
this Agreement, the Company may exercise from time to time any rights and
remedies available to it by law or in equity, including the rights and remedies
set forth in the Uniform Commercial Code as in effect from time to time in New
York.

      13.6 In the event of Default, the Company shall have the right, in the
name, place and stead of the P.C., to execute the necessary endorsements,
assignments or other instruments of conveyance or


                                    Page 18
<PAGE>

transfer with respect to all or any of the Collateral and the proceeds thereof.
The foregoing grant of authority is irrevocable and coupled with an interest.

      14. MEDICAL RECORDS

      14.1 The P.C. will maintain medical records regarding all patients of the
P.C.'s Practice as required by the laws of the State of New York and by the
rules and/or regulations of applicable governmental agencies, of third-party
payers, commercial insurers, health care plans or organizations and in
accordance with good medical practice.

      14.2 All business records compiled by the P.C. relating to its practice
shall remain the sole property of the P.C.

      14.3 All records relating to the services of the Company, which are
created and maintained by the Company, shall remain the sole property of the
Company.

      14.4 Upon reasonable notice, the parties shall permit each other access
during normal business hours to such books and records as pertain to the
services covered by this Agreement.

      14.5 The parties agree that medical records shall be retained for seven
(7) years or seven (7) from age of majority, or such longer period as specified
elsewhere within this Agreement. This provision shall survive the termination of
this Agreement.

      15. FISCAL MATTERS

      15.1 The P.C. shall have no responsibility or liability for any taxes or
governmental obligations imposed upon the Company, which shall be the sole
obligation of the Company.

      15.2 The Company shall have no responsibility or liability for any taxes
or governmental obligations imposed upon the P.C., which shall be the sole
obligation of the P.C.

16. INDEPENDENT CONTRACTOR RELATIONSHIP

      16.1 The Company and the P.C. acknowledge that the relationship between
them is that of independent contracting parties whereby the P.C. is a purchaser
and the Company is an independent contractor engaged in the business of
providing non-medical practice management, financial and consulting services.
Nothing contained herein shall be construed to create an employer-employee or
master-servant relationship.


                                    Page 19
<PAGE>

      16.2 The P.C. acknowledges that the Company has the right as an
independent contractor to affiliate or contract with any other person or entity
and nothing contained herein shall be construed as limiting that right.

      17. INTENT OF THE PARTIES: CHANGE IN LAW

      17.1 Neither the Company nor any of its personnel shall undertake or be
deemed to undertake the practice of medicine or provide medical advice to the
P.C. or its patients in the performance of services or other obligations under
this Agreement. The Company is not authorized to engage in any activity which
may be construed or deemed under any existing or future law or regulation to
constitute the practice of medicine, the ownership or operation of a medical
practice, or the operation of a health care facility. To the extent that any
acts of the Company required by any provision of this Agreement shall be
construed or deemed to constitute the practice of medicine, the ownership or
operation of a medical practice, or the operation of a health care facility or
if any acts of the P.C. under any provision of this Agreement shall be construed
or deemed to involve an act or service which may only be performed by a clinic,
diagnostic and treatment center or other health facility, said provision shall
be void ab initio or from the date of adoption of such law or regulation, as the
case may be, and the performance of said act or service shall be deemed waived.

      17.2 If in the opinion of counsel to the Company this Agreement, in whole
or in part, is deemed to be in violation of any future federal, state or local
statute, rule or regulation, the Company may, without electing an exclusive
remedy, (i) terminate this Agreement upon written notice which sets forth
counsel's opinion as to the effect of any newly enacted statute, rule or
regulation upon this Agreement and that the Agreement, in whole or in part,
violates such statute, rule or regulation, and/or (ii) demand that the Agreement
be re-negotiated in order to conform to any newly enacted statute, rule or
regulation.

      18. RESPONSIBILITIES OF THE P.C.

      18.1 The P.C. shall be solely responsible for:

      (a) all aspects of the medical care delivered and research conducted by
the P.C.;


                                    Page 20
<PAGE>

      (b) the selection, supervision, direction, contracting and employment,
hiring and firing of health care professionals, including all physicians,
licensed or certified technicians and providers of medical or nursing services
(hereinafter, collectively the "Health Professionals"). The P.C. agrees to hire
or engage only duly licensed and qualified Health Professionals.

      (c) the determination and payment of compensation and fringe benefits to
Health Professionals who are its employees or independent contractors;

      (d) establishing general operating policies and procedures of the P.C.;
and

      (e) all professional and ethical affairs of the P.C.'s medical practice.

      19. CONFIDENTIALITY / NON-SOLICITATION / NON-DISCLOSURE

      19.1 The Company and P.C. recognize and acknowledge that the during the
term of this Agreement, each of them shall have access to certain patents, trade
secrets and proprietary and confidential information of the other party. Company
and P.C. shall keep secret and confidential all information acquired about the
other party that is confidential, including but not limited to, the following
(collectively, the "Confidential Information."):

      i.    methods, techniques, controls, programs, management and financial
            strategies utilized by the Company or the P.C.;

      ii.   the financial condition of either party and any information related
            to this Agreement, including charges and rates for Consulting and
            Management services;

      iii.  any confidential or secret protocols, processes, formulas, designs,
            inventions, devices, plans, procedures or matters of any kind of
            either party;

      iv.   the patients, professional referral base, suppliers, customers,
            vendors, lenders; and

      v.    any confidential patient information, including without limitation,
            medical records, patient lists, charts or ledgers.

      19.2 Neither Company or P.C. shall at any time, during the term of this
Agreement or thereafter, disclose any such Confidential Information to any
person, form corporation, association or other entity for its own benefit,
indirectly or directly, or use the same in any manner other than in connection
with its performance of obligations under this Agreement, unless required by law
or in response to service of process. Neither Company or P.C. shall permit any
person to examine, copy or duplicate any Confidential Information in possession
of the P.C. or the Company.


                                    Page 21
<PAGE>

      19.3 Upon termination of this Agreement for any reason whatsoever, the
P.C. will return to the Company all Confidential Information, as well as any
copies or information derived therefrom. Provisions 19.1, 19.2 and 19.3 shall
survive the termination of this Agreement.

      19.4 During the term of this Agreement and for one (1) year after its
termination for any reason, any person who has been a shareholder of the P.C. at
any time during such period shall not, directly or indirectly, induce, attempt
to induce, or aid others in inducing, any person in the employ of the Company to
leave the Company's employment. The P.C. shall not employ or affiliate or
contract with, or enter into any business or financial agreement with, any
employee of the Company during the period which such person is employed by the
Company and for a period of one (1) year following said employee's termination
of employment with the Company, without the express written consent of the
Company. This provision shall survive the termination of this Agreement.

      19.5 The Company agrees that it will not disclose the treatment and/or
diagnosis of any identifiable patient of the P.C. to any third person except in
the course of its duties or where required by law and the Company agrees to
similarly instruct its employees.

      19.6 The parties acknowledge that disclosure of any Confidential
Information or breach of any part of this Paragraph will give rise to
irreparable injury that will be inadequately compensable in damages alone.
Accordingly, either party shall be entitled to seek injunctive relief against
the breach or threatened breach of this Paragraph in addition to any and all
other legal remedies that may be available. In addition to any other relief or
damages to which a party may be entitled, the successful party shall be entitled
to recoup the expenses of reasonable legal fees in any action brought to enforce
any provision of this Paragraph.

      19.7 If any provision contained in this Paragraph or anywhere in this
Agreement shall be deemed by any court of competent jurisdiction to be invalid,
illegal or unenforceable, then such provision shall be modified so as to make it
valid, legal and enforceable to the fullest extent permitted by law, and the
parties agree that such paragraph or provision shall be enforceable such extent.

      20. INDEMNIFICATION

      20.1 The P.C. shall indemnify, defend and hold harmless the Company and
its shareholders, officers, directors, employees and agents from and against any
and all losses, damages, injuries, claims, costs and expenses, including
reasonable legal expenses, arising out of or in connection with: (a) the


                                    Page 22
<PAGE>

conduct of its medical practice including research activities, (b) any breach of
this Agreement by the P.C. or any of its shareholders, and (c) the use or
operation by the P.C.'s employees, agents, patients or invitees of any item of
Equipment or Supplies, including the Isotopes, and its use and occupancy of the
Licensed Space and/or Furnishings.

      20.2 The Company shall indemnify and hold the P.C. and its shareholders
harmless from and against any and all losses, including legal expenses, damages,
injures, claims, demands, costs and expenses of whatsoever nature, including
reasonable legal expenses, arising out of or in connection with any breach of
this Agreement by the Company in the performance of its obligations under this
Agreement.

      20.3 The provisions contained in this Paragraph shall survive the
termination of this Agreement.

      21. NON-COMPETITION AND RESTRICTIVE COVENANT

      21.1 At not time during the term of this Agreement including any renewal
or other extension thereof, or at any time following the expiration or
termination this Agreement, for any reason (except with the prior written
consent of the Company), shall the P.C. or any of its shareholders directly or
indirectly (i) own, manage, operate, join, control or participate in the
ownership, management, operation or control of, or have an interest in or a
financial relationship with, or be connected in any manner with any business
utilizing the Patents or the Technology, or any improvements to the Patents or
the Technology.

      21.2 In order to give the language in the preceding Paragraph 21.1 effect,
the P.C. shall place the restriction contained in said Paragraph 21.1. in all
contracts and agreements with the P.C. shareholders, including, without
limitation, any employment agreements with such P.C. shareholders.

      21.3 The P.C. shall not issue any shares of its capital stock to any
person unless such person agrees, in writing, with the Company, to be bound by
those provisions of this Agreement which are binding upon the P.C. shareholders.

      21.4 The P.C. agrees that any remedy at law for any breach of the
foregoing covenants may be inadequate and that the Company shall be entitled to
seek injunctive relief to enjoin any violation, threatened or actual, of this
Paragraph 21.


                                    Page 23
<PAGE>

      21.5 If the restrictions herein specified are adjudged unreasonable in any
Court proceeding, the parties hereby agree to the reformation of such
restriction by the Court to the limits which the Court finds to be reasonable,
and the parties will not assert that such restrictions should be eliminated in
their entirety by such Court. The P.C. represents that it understands the full
extent of implication of the terms of this Section 21, and hereby acknowledges
and voluntarily agrees to be bound hereby.

      21.6 The provisions contained in this Paragraph 21 shall survive
termination of this Agreement.

      22. FORCE MAJEURE

      Neither party shall be liable for or deemed to be in default for any delay
or failure to perform any act under this Agreement (other than the payment of
money) resulting, directly or indirectly, from Acts of God, civil or military
authority, acts of public enemy, war, accidents fires, explosions, earthquake,
flood, failure of transportation, strikes or other work stoppages by either
party's employees, or any other cause beyond the reasonable control of such
party.

      23. REMEDIES OF THE P.C.

      23.1 All services provided by the Company pursuant to this Agreement are
furnished without warranty. The P.C.'s sole monetary remedy, and the Company's
sole monetary obligation, for any failure to render any service or any error or
omission or any delay or interruption with respect thereto, is limited to an
adjustment to the P.C. of the fee otherwise payable hereunder in an amount equal
to the fair market value of such services for the period during which the
failure, delay or interruption occurred. With the sole exception of the remedy
set forth in the immediately preceding sentence, the P.C. expressly waives, and
agrees not to make any claim for, any damages, direct or consequential, arising
out of any failure to furnish any such services, any error or omission with
respect thereto, or any delay or interruption of the same. In no event shall
there be any adjustment to the fee payable hereunder if the P.C. is in default
under the Agreement at such time.

      23.2 The P.C. may terminate this Agreement only upon a material breach by
the Company of its obligations to the P.C. hereunder (a "Material Breach"). A
Material Breach shall only be deemed to have occurred under the following
circumstances:


                                    Page 24
<PAGE>

      i.    The P.C. shall deliver to the Company a written notice, which notice
            shall provide in detail the alleged Material Breach.

      ii.   The Company shall have a period of ninety (90) days in which to cure
            such alleged Material Breach. If after the expiration of such ninety
            (90) day period the P.C. believes that such alleged Material Breach
            has not been cured, the P.C. shall send to the Company a further
            notice specifying in detail why it believes that the alleged
            Material Breach has not been cured. However, if the breach is not
            capable of cure within said forty-five (45) day period, then the
            Company shall have such time as is reasonably necessary to cure such
            breach provided that the Company commences action to cure the breach
            within the forty-five (45) day notice period and continues
            diligently to attempt to cure such breach.

      iii.  If after the expiration of the applicable period, the P.C. shall
            continue to maintain such alleged Material Breach shall not have
            been cured, it shall send the Company a notice that it has elected
            to terminate the Agreement on account of such alleged Material
            Breach (a "P.C. Termination Notice").

      iv.   If the Company shall dispute the P.C. Termination Notice then this
            Agreement shall not terminate unless and until a final determination
            by a court of competent jurisdiction has determined that such
            Material Breach has, in fact, occurred.

      24. ENTIRE AGREEMENT

      This Agreement sets forth the entire understanding between the parties
hereto and supersedes all other prior agreements between the parties. Each party
to this Agreement acknowledges that no representations, inducements, promises or
agreements, orally or otherwise, have been made by any party, or anyone acting
on behalf of any party, that are not embodied in this Agreement, and that no
other agreement, statement or promise not contained in this Agreement shall be
valid or binding as between the P.C. and the Company.

      25. COMPANY'S OPTION TO PURCHASE

      In the event that the State of New York in the future permits the
corporate practice of medicine without need to resort to a Certificate of Need,
or if, in the opinion of counsel to the Company, it


                                    Page 25
<PAGE>

otherwise becomes lawful in New York State for the Company to acquire and
operate the medical practice of the P.C., the Company shall have the right to
purchase a 50% ownership in the medical practice of the P.C. and the P.C. agrees
to sell a 50% ownership in the medical practice of the P.C. to the Company. The
purchase price shall be $100. In order to make meaningful the foregoing right,
the P.C. agrees that any purchaser of the P.C. or transferee or other recipient
of share thereof and any successor P.C. and shareholders thereof shall be bound
by the provisions of this Paragraph and no sale of the P.C. or transfer of
shares thereof shall be effective unless the purchaser or transferee
acknowledges in writing his agreement to the provisions of this Paragraph.

      26. MODIFICATION

      This Agreement may not be orally changed or modified. All changes or
modifications to this Agreement shall be in writing signed by the party against
whom enforcement of any waiver, change, modification, extension or discharge is
sought.

      27. WAIVER

      No delay or failure to exercise any remedy or right occurring upon any
breach or default shall be construed as a waiver of such remedy or right, nor
shall it affect any subsequent default of a same or different nature.

      28. ASSIGNMENT

      28.1 The P.C. shall not assign this Agreement or any of its rights or
obligations under this Agreement without the prior written consent of the
Company. Any transfer of the profits, losses or cash flow of the P.C. shall also
constitute an assignment hereunder and constitute a Material Breach. The Company
shall have a right to assign this Agreement in connection with a transfer of all
or substantially all of the Company's business, whether by sale, merger or
otherwise.

      28.2 The P.C. specifically agrees that the Company shall have the right to
perform the services to be provided hereunder through any parent, subsidiary,
division or affiliate of the Company without written consent from the P.C.


                                    Page 26
<PAGE>

      29. SUCCESSORS AND ASSIGNS

      All of the provisions herein contained shall be binding upon and inure to
the benefit of the respective successors and permitted assigns of the parties
hereto to the same extent as if such successors and permitted assigns were in
each case named as a party to this Agreement.

      30. EFFECT OF INVALIDITY

      Should any part of this Agreement for any reason be declared invalid, such
decision shall not affect the validity of any remaining portion, which remaining
portion shall remain in force and effect as if this Agreement had been executed
with the invalid parts thereof eliminated.

      31. NOTICES

      Any notice or communications required or permitted hereunder shall be
deemed to have been sufficiently given or served for all purposes if in writing
and delivered personally to the party or to an officer of the party, or sent by
registered or certified mail, postage and charges prepaid, return receipt
requested to the parties' addresses as set forth below:

                           To the P.C.:     MITCHELL E. LEVINE, M.D., P.C.
                                            c/o Mitchell E. Levine, MD
                                            700 Stewart Avenue, 2d Floor
                                            Garden City, NY  11530

                           To the Company:  Molecular Radiation Management, Inc.
                                            700 Stewart Avenue, 2d Floor
                                            Garden City, NY  11530

or such other address as may subsequently be provided to the other party in
writing. Unless otherwise expressly set forth in this Agreement, any such notice
shall be deemed to be given on the date on which the same was deposited in a
regularly maintained receptacle for the deposit of United States mail, addressed
and sent as above.


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<PAGE>

      32. FURTHER ACTIONS

      At any time and from time to time, each party agrees, without further
consideration, to take such actions and to execute and deliver such documents as
may be necessary to effectuate the purposes of this Agreement.

      33. PARAGRAPH CAPTIONS

      The paragraph captions contained in this Agreement are inserted only as a
matter of convenience and reference, and in no way define, limit or describe the
scope of this Agreement, nor the intent of any provision thereof.

      34. COUNTERPARTS

      This Agreement may be executed in one or more counterparts, each of which
shall be deemed an original, but which, taken together, shall constitute one
Agreement.


                                    Page 28
<PAGE>

      35. GOVERNING LAW

      This Agreement shall be governed by and construed in accordance with the
laws of the State of New York. Nassau County shall be the sole venue for any and
all litigation between the parties.

      IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the date first above written:

                                        MOLECULAR RADIATION MANAGEMENT, INC.

                                        By:_____________________________________
                                               JACK SCHWARTZBERG, PRESIDENT


                                        MITCHELL E. LEVINE, M.D., P.C.

                                        By:_____________________________________
                                            MITCHELL E. LEVINE, M.D., PRESIDENT


                                    Page 29