**EXHIBIT 10.1****AMENDMENT TO LEASE**     AMENDMENT TO LEASE (the “Amendment”) dated as of April 26, 2006, by and between 5700 WEST96th STREET, a California general partnership (“Landlord”) and DIAGNOSTIC PRODUCTSCORPORATION, a California corporation (“Tenant”).**WITNESSETH**     A. Pursuant to a certain lease dated February 18, 1991 (the “Original Lease”),Landlord leased to Tenant certain premises (the “Leased Premises”) described in the Original Lease(the “Property”), which Original Lease was extended by (i) an Addendum to Standard Industrial Leasedated February 18, 1991; (ii) an Addendum to Standard Industrial Lease dated April 2002, and (iii)a Standard Industrial Lease Option Exercise dated January 1, 2005 (the Original Lease and suchAddenda and Standard Industrial Lease Option Exercise collectively being the “Lease”).     B. The term of the Lease, as previously extended, expires on December 31, 2006.     C. The parties now desire to further extend the term of the Lease.     NOW, THEREFORE, in consideration of the mutual covenants and conditions set forth in thisAmendment, and for other good and valuable consideration, the receipt and sufficiency of which arehereby acknowledged, the parties hereto, agree as follows:1. **Incorporation of Recitals and Defined Terms.**The recitals set forth above areincorporated into this Amendment as if set forth herein at length. All capitalized terms used inthis Amendment shall have the meanings ascribed to them in the Lease, unless otherwise definedherein.2. **Extension of Term.**The term of the Lease (the “Term”) is hereby extended for anadditional period of two (2) years commencing January 1, 2007 and expiring on December 31, 2008(the “Extension Period’).3. **Base Rent.**The base rent payable by Tenant to Landlord pursuant to Section 4 of theLease (i) during calendar year 2007 will be a fixed monthly rent of $92,826, and (ii) duringcalendar year 2008 shall be $95,147.4. **Insurance.**Tenant shall provide Landlord with proof of liability and casualty insurancecoverages required under the Lease no later than the date hereof.5. **Terms and Conditions.**All of the terms, covenants and conditions set forth in the leaseshall continue in full force and effect, except as otherwise set forth in this Amendment.
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6. **Condition to Effectiveness.**This amendment shall be effective only if the closing occursunder that certain Agreement and Plan of Merger, dated as of April 26, 2006, among Siemens MedicalSolutions USA, Inc., Diagnostic Products Corporation, and Dresden Acquisition Corporation, andshall be effective as of the “Effective Time” as defined in such agreement.7. **Miscellaneous.**     (a) As specifically modified by this Amendment, all of the provisions of the Lease areconfirmed to be and shall remain in full force and effect.     (b) Landlord and Tenant each represent and warrant to the other that it has not dealt withany broker, agent, finder or other person in connection with this Amendment. Landlord and Tenantshall each indemnify and hold the other harmless from and against all claims, costs (includingattorneys’ fees) and liabilities for commissions or other compensation claimed by any broker,agent, finder or other person, by virtue of having been employed or engaged by such party or havingdealt with such party with regarding to this Amendment.     (c) This Amendment shall be binding upon, and shall insure to the benefit of Landlord andTenant and their respective successors and assigns.     (d) This Amendment may be executed in two or more counterparts, each of which shall be deemedan original, but all of which taken together shall constitute one in the same instrument.