On March 10, 2024, Celltrion announced in a press release that it submitted an abbreviated Biologics License Application (aBLA) for FDA approval of CT-P39 (omalizumab), a proposed interchangeable biosimilar of Genentech’s / Novartis’ Xolair® (omalizumab). This is the first publicly announced aBLA for a proposed biosimilar of Xolair®. No patent proceedings related to any proposed Xolair® biosimilar have been filed to date.

Xolair® generated worldwide sales of $3.85B in 2023.

We continue to monitor this aBLA and will provide updates once available.  For more information on pending aBLAs, please visit



The authors would like to thank April Breyer Menon for her contributions to this article.


    Information contained in the Venable BiologicsHQ database relates to FDA-approved drug products listed in the CDER Purple Book or on the FDA website ( Information relating to FDA licensed products, FDA-approved indications, and aBLA and 505(b)(2) applications is obtained from public sources including the U.S. FDA website ( Information relating to litigations is given only for cases active from January 31, 2010 onward. Information relating to foreign biosimilar / biologics follow-on products approved in Australia, Canada, the E.U., Japan and South Korea is from public sources. Statistics graphics are compiled from information contained in the Venable BiologicsHQ database.


    The individuals who maintain this site work for Venable LLP. The information, comments and links posted on this site do not constitute legal advice. No attorney-client relationship has been or will be formed by any communication(s) to, from or with the site and/or the author. For legal advice, contact an attorney at Venable LLP or an attorney actively practicing in your jurisdiction. Do not send any confidential or privileged information to the author; neither Venable LLP nor the author will assume any liability or responsibility for it. If you send any information, documents or materials to the site, you give permission for the author to include them on or in the site. No information, documents or materials you send to the site will be considered confidential or privileged by Venable LLP or its lawyers. Also, no such information, documents or materials will be returned to you. All decisions relating to the content belong to the author.

    Subscribe for Future Updates