Document:

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                                    ADDENDUM
                                       TO
                                   USCMC-USCC
                              PARTNERSHIP AGREEMENT

         THIS ADDENDUM is made by and between US CANCER CARE, INC., a Delaware
corporation ("USCC"), and US CANCER MANAGEMENT CORPORATION, a Delaware
corporation ("USCMC"), and is intended to be an addendum and a modification of
that certain PARTNERSHIP AGREEMENT dated April 5, 2000, between the parties.

         A.       Section 1.03 of the PARTNERSHIP AGREEMENT is hereby amended to
                  read as follows:

                  "1.03. Purpose of Partnership.

                  The purpose of this partnership is to manage the development,
         building, and operations of cancer care centers in Rhonert Park,
         California, and Fresno, California, only, pursuant to the agreement
         between the Partnership and the Permanente Medical Group, Inc.
         ("TPMG"), dated September 7th, 2000, and any and all activities that
         are reasonably and directly related to, and to, or in furtherance of
         those activities. However, in the event that TPMG desires to use an
         outside contractor (that is, an entity that is not owned by TPMG) to
         provide PET imaging services to patients at the Partnership's cancer
         centers, then the Partnership shall seek to manage this PET imaging
         business by mutual agreement with TPMG. In no event shall USCC or USCMC
         act to manage such business independent of the Partnership with respect
         to all centers owned by the Partnership. The Partnership may also
         manage, develop, build, and operate additional cancer care centers or
         engage in any other lawful business, but only with the unanimous
         written agreement of all of the Partners. It is understood that neither
         USCMC nor W. Brian Fuery are obligated to bring to the attention of the
         Partnership any business opportunities, whether or not identical or
         similar to the purposes of this Partnership outside of Rhonert Park,
         Fresno, Modesto, Stockton, Turlock, Sonora and Hayward, California.

                  In the event USCMC suggests that the Partnership develop
         additional cancer care centers, USCMC shall present to the Partnership
         a complete proposal with reasonably detailed budget and projections and
         full disclosure of all other information reasonably necessary to make
         an informed decision. USCC shall have thirty (30) days from receipt of
         the completed proposal to accept or reject the proposal as a
         partnership project. Lack of a response within said time period shall
         be a rejection. If the proposal is rejected by USCC, then USCMC is free
         to proceed with the project on its own on the same basis as presented
         to the Partnership without any further responsibility to the
         Partnership or to USCC with respect to the said project."

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         B.       Section 5.05 of the PARTNERSHIP AGREEMENT is herby amended to
                  read as follows:

                  Each Partner, including a Managing General Partner, either
         individually or collectively, may participate in other business
         ventures of every kind, but only to the extent that those other
         business ventures 1) do not compete with or materially interfere with
         the Partnership or USCC business in the geographic locations of
         Modesto, Stockton, Turlock, Sonora, Hayward above or other centers
         first developed by the Partnership including Fresno and Rhonert Park,
         2) and do not obtain patients from any of these existing geographic
         areas described as Modesto, Stockton, Turlock, Sonora, Hayward, Fresno
         and Rhonert Park in which the Partnership or USCC treats patients, 3)
         and do not conflict with the obligations of that Partner under this
         Agreement. Neither the Partnership nor any other Partner shall have any
         right to any income or profit derived from any such other business
         venture of any Partner or Partners permitted under this Section.
         Notwithstanding the forgoing, neither W. Brian Fuery nor USCMC are
         precluded from competing in areas other than Modesto, Stockton,
         Turlock, Sonora and Hayward, California as set forth in Section 1.03
         above or other centers first developed by the Partnership including
         Fresno and Rhonert Park.

         C.       Section 5.07 of the PARTNERSHIP AGREEMENT is hereby amended to
                  read as follows:

                         The specific duties and responsibilities of USCC shall
                    be as follows:

         D.       Section 5.07(e) of the PARTNERSHIP AGREEMENT is hereby amended
                  to read as follows:

                         "(e) To provide for or obtain capital financing of all
                    costs of real estate acquisition, development, building and
                    construction and to provide for or obtain capital funding
                    for medical equipment necessary for the cancer centers
                    contemplated for Rhonert Park and Fresno within 20 days of a
                    written demand from either partner. It is understood the
                    working capital needs of the center will be the
                    responsibility of the partnership in accordance with the
                    terms of the Partnership Agreement. . Further, it is agreed
                    that if USCC loans any monies to the partnership to be
                    utilized as deposits towards or in connection with the
                    development of the real estate, that such deposits will be
                    returned to USCC in full upon the completion and receipt of
                    USCC's arranged financing of such real estate development.

         E.       Section 5.08(e) of the PARTNERSHIP AGREEMENT is hereby amended
                  to read as follows:

         "(e) To acquire or otherwise procure the use of both the facility and
equipment for each cancer center under the agreement between the Partnership and
TPMG. USCMC is discussing with TPMG the financing for or other funding of such
acquisitions through TPMG."

         A new Section 5.08(f) is added to the PARTNERSHIP AGREEMENT which will
read as follows:

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                  "(f) To render monthly financial and operations reports to the
         Partners within 30_days, or a reasonbable time, after the end of each
         calendar month.

         F.       Section 5.09 of the PARTNERSHIP AGREEMENT is hereby amended to
                  read as follows:

                  5.09. Loan to Partnership by USCC.

                  For the first twelve (12) months of the Partnership's
operations, commencing on November 7, 2000, USCC shall loan to the Partnership
the sum of Sixteen Thousand Six Hundred Sixty-Six and 67/100 Dollars
($16,666.67) per month, payable on the first business day of each month. For the
second twelve (12) months of the Partnership's operations, USCC shall loan to
the Partnership the sum of Eight Thousand Three Hundred Thirty-Three and 33/100
Dollars ($8,333.33) per month, payable on the first business day of each month.
Accordingly, by the end of the second year of the Partnership's operations, USCC
shall have loaned to the Partnership the total sum of Three Hundred Thousand
Dollars ($300,000.00).

                  In order to assure the funding of this loan commitment, USCC
shall, within fifteen (15) days after the signing of this Addendum to the
PARTNERSHIP AGREEMENT, deposit the sum of $ 200,000 into an interest-bearing
account with Merrill Lynch, an Escrow Holder agreed upon between the partners,
with written Escrow Instructions providing that Escrow Holder shall make a
payment by the fifth (5th) day of each month commencing May 1, 2001, to US
Cancer Management Corporation ("USCMC") c/o W. BRIAN FUERY in a sum equal to the
payment due ($16, 666.67 per month through October 31, 2001 and $8,333.33 per
month until paid in full, estimated to be October 31, 2001 ). It is understood
and agreed that the funds in said account will be devoted solely to the payment
of the loan to the Partnership as provided in this section and that the Escrow
Holder may withdraw from said account only for the purpose of meeting said
payments. USCC shall have no rights to withdraw from said fund until the total
amount is paid to USCMC and approved by it. It is further agreed that after all
payments have been made in satisfaction of said loan, all accrued interest and
any remaining balance in said account shall belong to and shall be returned to
USCC and said account may be closed by USCC.

                  USCC shall be in default under this Agreement if any payment
due under this loan is not paid within ten (10) days after its due date, or if
USCC fails to perform any of its other obligations hereunder within ten (10)
days of the date the obligation is to be performed. USCC shall have twenty (20)
days to cure such a default after Notice. If USCC is in default under paragraph
5.07(a) (pertaining to this loan) or under paragraph 5.07(e) (pertaining to
capital financing) only and such default has not been fully cured within twenty
(20) days after such Notice, then, at such time, with notice, USCC's percentage
interest in either Rhonert Park or Fresno shall automatically and irrevocably be
reduced to five percent (5%), and USCMC's percentage interest shall be increased
to ninety-five percent (95%) in that SPECIFIC CENTER PROJECT ONLY. A reduction
in percentage interest under this Section shall in no way relieve or release
USCC of its obligations hereunder, including any obligations then in default;
regardless of any such reduction in percentage interest of USCC, USCC shall
continue to be obligated in the same manner and in the same amounts as before
the reduction, and USCC shall have no right to the restoration of any such
percentage interest reduced under this Section. Upon full satisfaction of

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the requirements under Sections 5.07(a) and (e) herein with respect to Rhonert
Park and Fresno only , this obligation for any further percentage reduction in
ownership shall be void.

                  If USCC is in default under paragraph 5.07(b), (c), or (d),
then the cost to the Partnership of obtaining the services set forth in any of
those paragraphs shall be a charge against the distributive profit share of USCC
and shall be treated as if said amount had been distributed to USCC.

                  Provided that USCC is not in default under this Agreement, the
Partnership agrees to repay this loan to USCC in sixty (60) equal monthly
installments in the amount of Five Thousand Dollars ($5,000.00) each, without
interest, commencing on the later of i) the end of the second full year of the
Partnership's operations, or ii) ninety (90) days after the date that the cancer
care centers as contemplated in this Partnership's agreement with TPMG are
completed and have become operational and profitable on a GAAP and cash flow
basis. The loan repayment shall be due and payable on the first of each month
once the commencement conditions are met. If such payment is not received by the
10th of each month, then interest shall accrue and be paid at a rate of 9 %. If
USCC is in default or becomes in default under either paragraph 5.07(a) or
5.07(e) of this Agreement, then each monthly payment under this paragraph shall
be reduced from $5,000.00 to One Hundred Dollars ($100.00), and the payments
shall continue on a monthly basis for as long as necessary until the principal
of the loan has been repaid in full.

                  IN WITNESS WHEREOF this ADDENDUM TO USCMC-USCC PARTNERSHIP
AGREEMENT is executed by the parties, which execution may be in counterparts,
and is agreed to be effective as of April 5, 2001.

GENERAL PARTNERS:

US Cancer Care, Inc.,                        US Cancer Management Corporation,
a Delaware corporation                       a Delaware corporation
700 Ygnacio Valley Road                      700 Ygnacio Valley Road
Suite 300                                    Suite 300
Walnut Creek, California 95696               Walnut Creek, California 95696
Telephone: (925) 279-2273                    Telephone: (925) 279-2273

By: /s/ Richard Padelford                    By: /s/ W. Brian Fuery
   -------------------------------------        --------------------------------
   RICHARD PADELFORD                            W. BRIAN FUERY
   President and Chief Operating Officer        President and Secretary

By: /s/ Jeffrey Goffman
   -------------------------------------
   JEFFREY GOFFMAN
   Chief Executive Officer and Secretary<PAGE>   1
                                                                    EXHIBIT 10.1

                         EXECUTIVE INCENTIVE BONUS PLAN

SECTION 1 PURPOSE

         This Executive Incentive Bonus Plan (the "Plan") is intended to enable
IDEX Corporation (the "Company") to attract and retain highly qualified
executives and to provide financial incentives to those executives in order to
promote the success of the Company. The Plan is for the benefit of Eligible
Executives (as defined below). The Plan is designed to ensure that the bonuses
paid hereunder to Eligible Executives are deductible without limit under Section
162(m) of the Internal Revenue Code of 1986, as amended (the "Code"), and the
regulations and interpretations promulgated thereunder.

SECTION 2 ELIGIBLE EXECUTIVES

         "Eligible Executives" are defined as the Chief Executive Officer of the
Company and any other officer of the Company designated by the Compensation
Committee.

SECTION 3 ADMINISTRATION

         The Compensation Committee of the Board of Directors (the "Board")
shall have the sole discretion and authority to administer the Plan, interpret
the terms and provisions of the Plan and to establish, adjust, pay or decline to
pay bonuses under the Plan. The Compensation Committee shall consist of at least
two members of the Board who shall qualify as "outside directors" under Section
162(m) of the Code.

SECTION 4 BONUS DETERMINATIONS

         An Eligible Executive may receive a bonus payment under the Plan based
upon the attainment of performance goals established by the Compensation
Committee, which relate to the achievement of positive "Operating Income." For
purposes of the Plan, "Operating Income" shall mean income from operations of
the Company, before extraordinary items, interest and taxes.

         Within the first ninety (90) days of each fiscal year (or such other
period as may be permitted by Section 162(m) of the Code), the Compensation
Committee will designate those Eligible Executives who are to be participants in
the Plan for that fiscal year and will specify the objective terms and
conditions for the determination and payment of a bonus for each participant.
The objective terms and conditions relating to Operating Income set by the
Compensation Committee may include, but are not limited to, sales growth and
increase in operating margins. In the event of a change in the Company's fiscal
year, the Plan shall apply, with appropriate pro-rata adjustments, to any fiscal
period not consisting of twelve months.

         No bonuses shall be paid to a participant unless and until the
Compensation Committee makes a certification in writing with respect to the
attainment of the performance objectives as required by Section 162(m) of the
Code. Although the Compensation Committee may in its sole discretion reduce a
bonus payable to a participant based on such objective and/or subjective factors
as it may determine, the Compensation Committee shall have no discretion to
increase the amount of a participant's bonus as determined under the applicable
objective terms and conditions established for such bonus amount.

         The maximum bonus that may be payable to any participant for any fiscal
year may not exceed 2.0% of the Company's Operating Income for that fiscal year.

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         Following the Compensation Committee's determination and certification
of the amount of any bonus payable, such amount will be paid in cash (subject to
any election made by an Eligible Executive with respect to the deferral of all
or a portion of his or her bonus or the payment of all or a portion of his or
her bonus in some form other than cash). Payment of the bonus amount will be
made as soon as feasible after the Compensation Committee's certification of the
amount payable but not after two and one-half months following the end of the
fiscal year to which the bonus relates.

SECTION 5 AMENDMENT AND TERMINATION

         The Company reserves the right to amend or terminate the Plan at any
time in its sole discretion. Any amendments to the Plan shall require
shareholder approval only to the extent required by Section 162(m) of the Code.

SECTION 6 SHAREHOLDER APPROVAL

         No bonuses shall be paid under the Plan unless and until the Company's
shareholders shall have approved the Plan and the performance goals as required
by Section 162(m) of the Code. The Plan will be in effect from the time of
shareholder approval to the tenth anniversary of the date of such approval. If
the Plan is amended in any way that changes the material terms of the Plan's
performance goals, including by materially modifying the performance goals,
increasing the maximum bonus payable under the Plan or changing the Plan's
eligibility requirements, the Plan shall be resubmitted to the Company's
shareholders for approval as required by Section 162(m) of the Code.

                                                          * * * *

         I hereby certify that the foregoing Plan was duly approved by the Board
of Directors of IDEX Corporation effective November 28, 2000.

         Executed on this ____ day of ___________, 2001.

                                      ------------------------------------------
                                      Secretary

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