May 11, 2017

Announcement of a Lawsuit Filed against Chugai

Name of listed company: Chugai Pharmaceutical Co., Ltd.
Code number: 4519 (1st Section of Tokyo Stock Exchange)
Head office: 1-1, Nihonbashi-Muromachi 2-Chome, Chuo-ku, Tokyo
Chairman & CEO: Osamu Nagayama
Inquiries to: Masahiko Uchida,
General Manager, Corporate Communications Dept.

Chugai Pharmaceutical Co., Ltd. (Head office: Chuo-ku, Tokyo / Chairman & CEO: Osamu Nagayama) announces that a lawsuit was filed against Chugai at the United States District Court for the District of Delaware as follows.

  1. Date of Complaint
    May 4, 2017
  2. Reasons and Background for the Action
    Baxalta alleges that the new drug candidate under development for the treatment of hemophilia A, emicizumab (development code: ACE910), infringes one of its US patent (patent number 7,033,590). Thus, Baxalta filed a lawsuit against Chugai and Genentech Inc., requesting relief including an injunction enjoining manufacturing, using, offering to sell, or selling emicizumab within the US, or importing emicizumab into the US.
  3. Party Who Filed the Complaint
    (1) Name: Baxalta Incorporated
    Baxalta GmbH
    (2) Address: 1200 Lakeside Drive, Bannockburn, Illinois, USA
    Glattpark (Opfikon), Switzerland
  4. Contents of the Complaint
    A judgement for an injunction against infringement of patent right, etc.
  5. Prospects
    The complaint has not been served, but our understanding is that it alleges that Chugai is infringing Baxalta’s US patent by manufacturing, selling and importing emicizumab in the US.

    However, Chugai is confident that emicizumab does not infringe the plaintiff’s patent and will vigorously challenge the infringement allegations and the validity of the patent, and assert other defenses as appropriate.

    Therefore, no changes are expected to be made to the financial prospects of fiscal year 2017.


  • For Media
  • Chugai Pharmaceutical Co., Ltd.
  • Media Relations Group, Corporate Communications Dept.,
  • Koki Harada
  • Tel: +81-3-3273-0881
  • E-mail:
  • For Investors
  • Chugai Pharmaceutical Co., Ltd.
  • Investor Relations Group, Corporate Communications Dept.,
  • Toshiya Sasai
  • Tel: +81-3-3273-0554
  • E-mail:
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