Exhibit 4.1



 






Exhibit 4.1




FIRST AMENDMENT




TO




RIGHTS AGREEMENT




By and Among




CANCERVAX CORPORATION




and




MELLON INVESTOR SERVICES LLC




Dated as of March 17, 2006




 









 





FIRST AMENDMENT TO RIGHTS AGREEMENT




     THIS FIRST AMENDMENT TO RIGHTS AGREEMENT (this “Amendment”), dated as of March 17, 2006, is by
and among CancerVax Corporation, a Delaware corporation (the “Company”) and Mellon Investor
Services LLC, a New Jersey limited liability company, as Rights Agent (the “Rights Agent”).



RECITALS




     WHEREAS, the Company and the Rights Agent, who are parties hereto, previously entered into
that certain Rights Agreement dated as of November 3, 2004 (the “Rights Agreement”).



     WHEREAS, on January 6, 2006, an Agreement and Plan of Merger and Reorganization (the “Merger
Agreement”) was entered into by and among Carlsbad Acquisition Corporation, a Delaware corporation
(“Merger Sub”), Micromet, Inc., a Delaware corporation (“Micromet Parent”), Micromet AG, a
corporation organized under the laws of Germany (“Micromet”), and the Company.



     WHEREAS, pursuant to the Merger Agreement, and subject to the terms and conditions therein,
Merger Sub will merge with and into Micromet Parent, with Micromet Parent surviving as a
wholly-owned subsidiary of the Company and Micromet surviving as a wholly-owned subsidiary of
Micromet Parent (the “Merger”).



     WHEREAS, pursuant to the Merger Agreement, the Company is required, as a condition to the
Merger, to exclude Micromet Parent, Micromet and their stockholders from the definition of
“Acquiring Person” under the Rights Agreement as of the Effective Time (as defined in the Merger
Agreement) of the Merger.



     WHEREAS, pursuant to Section 26 of the Rights Agreement, the Company may in its sole and
absolute discretion, and the Rights Agent shall, if the Company so directs, supplement or amend any
provision of the Rights Agreement.



     WHEREAS, the Company now desires to amend the Rights Agreement as set forth herein.



AGREEMENTS




     NOW, THEREFORE, in consideration of the foregoing premises and mutual agreements set forth in
this Amendment, the parties hereby amend the Rights Agreement as follows:



 









 





     1. Definitions. Capitalized terms used herein and not otherwise defined herein shall
have the meanings assigned to such terms in the Rights Agreement.



     2. Amendment to Definition of Acquiring Person: Section 1.1 of the Rights Agreement
is hereby amended to add the following sentence after the last sentence thereof: “Notwithstanding
the foregoing, neither Micromet, Inc., a Delaware corporation, nor Micromet AG, a corporation
organized under the laws of Germany, nor any of their stockholders shall become an Acquiring Person
as a result of the execution of the Agreement and Plan of Merger and Reorganization, dated as of
January 6, 2006, as amended, by and among the Company, Carlsbad Acquisition Corporation, a Delaware
corporation, Micromet AG, a corporation organized under the laws of Germany, and Micromet, Inc., a
Delaware corporation, or consummation of the transactions contemplated thereby.”



     3. No Other Amendments. Except as expressly provided in this Amendment, the Rights
Agreement is, and shall continue to be, in full force and effect in accordance with its terms,
without amendment thereto, and is, in all respects, ratified and confirmed. This Amendment may be
executed in any number of counterparts and each of such counterparts shall for all purposes be
deemed to be an original, and all such counterparts shall together constitute one and the same
instrument. This Amendment may be executed by facsimile signatures.



[Remainder of page intentionally left blank.]





 









 








     IN WITNESS WHEREOF, the parties hereto have caused this First Amendment to Rights Agreement to
be duly executed and delivered as of the date first above written.



	 	 	 	 	 	 	 
	 	 	CANCERVAX CORPORATION	 	 
	 
	 	 	 	 	 	 
	 

	 	By:
	 	/s/ Hazel M. Aker	 	 
	 

	 	 	 	 	 	 
	 

	 	 	 	Name: Hazel M. Aker	 	 
	 

	 	 	 	Title: Senior Vice President and
General Counsel	 	 
	 
	 	 	 	 	 	 
	 	 	MELLON INVESTOR SERVICES LLC	 	 
	 
	 	 	 	 	 	 
	 

	 	By:
	 	/s/ Martha Mijango	 	 
	 

	 	 	 	 	 	 
	 

	 	 	 	Name: Martha Mijango	 	 
	 

	 	 	 	Title: Assistant Vice President	 	 







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