Filed by Amgen Inc. Pursuant to Rule 425
                                                under the Securities Act of 1933
                                        and deemed filed pursuant to Rule 14a-12
                                       under the Securities Exchange Act of 1934

                                            Subject Company: Immunex Corporation
                                                     Commission File No. 0-12406

This filing relates to the proposed acquisition ("Acquisition") by Amgen Inc.
("Amgen") of Immunex Corporation ("Immunex") pursuant to the terms of an
Agreement and Plan of Merger, dated as of December 16, 2001 (the "Merger
Agreement"), by and among Amgen, AMS Acquisition Inc. and Immunex. The Merger
Agreement is on file with the Securities and Exchange Commission as an exhibit
to the Current Report on Form 8-K filed by Amgen on December 17, 2001 and is
incorporated by reference into this filing.

On February 6, 2002 Amgen and Immunex issued a joint press release announcing
that Amgen and Immunex had received a request from the Federal Trade Commission
for additional information regarding the Acquisition. The text of the joint
press release is as follows:

AMGEN AND IMMUNEX RECEIVE REQUEST FOR ADDITIONAL INFORMATION FROM THE FEDERAL
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TRADE COMMISSION
----------------

For Immediate Release
Thousand Oaks, Calif. and Seattle, Washington -- February 6, 2002 -- Amgen
(Nasdaq: AMGN) and Immunex Corporation (Nasdaq: IMNX) today announced that they
have received a request for additional information from the Federal Trade
Commission (FTC) in connection with the previously announced acquisition of
Immunex by Amgen.

The companies intend to respond promptly to the information request. This
"second request" extends the waiting period under the Hart-Scott-Rodino
Antitrust Improvements Act of 1976 during which the FTC is permitted to review
the transaction. While the companies cannot estimate how long it will take to
comply with the second request, they continue to anticipate the merger will
close in the second half of 2002, as announced previously.

This news release contains forward-looking statements within the meaning of the
"safe harbor" provisions of the Private Securities Litigation Reform Act of
1995, including statements about Amgen's anticipated acquisition of Immunex.
These statements are based on management's current expectations and beliefs and
are subject to a number of risks, uncertainties and assumptions that could cause
actual results to differ materially from those described in the forward-looking
statements. All statements other than statements of historical fact are
statements that could be deemed forward-looking statements. For example,
statements regarding timing of closing are forward-looking statements. Risks,
uncertainties and assumptions include the possibility that the Immunex
acquisition does not close or that the companies may be required to modify
aspects of the



transaction to achieve regulatory approval and other risks that are described in
the Securities and Exchange Commission reports filed by Amgen and Immunex,
including their most recent filings on Form 10-Q. Because forward-looking
statements involve risks and uncertainties, actual results and events may differ
materially from results and events currently expected by Amgen and Immunex. The
companies are providing this information as of February 6, 2002. Amgen and
Immunex assume no obligation and expressly disclaim any duty to update
information contained in this news release except as required by law.

Additional Information about the Acquisition and Where to Find It
-----------------------------------------------------------------
In connection with the proposed acquisition, Immunex and Amgen have filed with
the SEC a joint proxy statement/prospectus and other relevant materials that
contain important information about the merger. The joint proxy
statement/prospectus will be mailed to the stockholders of Immunex and Amgen.
Investors and security holders of Immunex and Amgen are urged to read the joint
proxy statement/prospectus and the other relevant materials because they contain
important information about Immunex, Amgen and the acquisition. The joint proxy
statement/prospectus and other relevant materials and any other documents filed
by Immunex or Amgen with the SEC may be obtained free of charge at the SEC's web
site at www.sec.gov. In addition, investors and security holders may obtain free
copies of the documents filed with the SEC by Immunex by contacting Immunex
Corporation, 51 University Street, Seattle, WA 98101, Attn: Investor Relations.
Investors and security holders may obtain free copies of the documents filed
with the SEC by Amgen by directing a request to: Amgen Inc., One Amgen Center
Drive, Thousand Oaks, CA 91320, Attn: Investor Relations. Investors and security
holders are urged to read the joint proxy statement/prospectus and the other
relevant materials before making any voting or investment decision with respect
to the acquisition.

Immunex, Amgen and their respective executive officers and directors may be
deemed to be participants in the solicitation of proxies from the stockholders
of Immunex and Amgen in favor of the merger. Information about the executive
officers and directors of Immunex and their ownership of Immunex common stock is
set forth in the proxy statement for the Immunex 2001 Annual Meeting of
Shareholders, which was filed with the SEC on March 16, 2001. Information about
the executive officers and directors of Amgen and their ownership of Amgen
common stock is set forth in the proxy statement for Amgen's 2001 Annual Meeting
of Stockholders, which was filed with the SEC on April 4, 2001. Investors and
security holders may obtain more detailed information regarding the direct and
indirect interests of Immunex, Amgen and their respective executive officers and
directors in the merger by reading the joint proxy statement/prospectus
regarding the acquisition.

About Amgen
-----------
Amgen is a global biotechnology company that discovers, develops, manufactures
and markets important human therapeutics based on advances in cellular and
molecular biology.

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About Immunex
-------------
Immunex Corporation is a leading biopharmaceutical company dedicated to
improving lives through immune system science innovation.




CONTACT:

Amgen:
-----
Jeff  Richardson, 805/447-8925 (media)
Cary Rosansky, 805/447-4634 (investors)

Immunex:
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Robin Shapiro 206-389-4040 (media)
Mark Leahy 206-389-4363 (investors)




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