On September 25, 2025 Moleculin Biotech, Inc., (Nasdaq: MBRX) ("Moleculin" or the "Company"), a late-stage pharmaceutical company with a broad portfolio of drug candidates targeting hard-to-treat cancers and viral infections, reported that the Canadian Intellectual Property Office (CIPO) has issued a notice of allowance for Patent Application No. 3,142,510 titled, "PREPARATION OF PRELIPOSOMAL ANNAMYCIN LYOPHILIZATE." A patent from the application is expected to be issued in the coming months (Press release, Moleculin, SEP 25, 2025, https://moleculin.com/moleculin-announces-notice-of-allowance-for-canadian-patent-covering-annamycin/ [SID1234656241]).
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When issued, the patent claims will cover methods of making a preliposomal Annamycin lyophilizate with improved stability and high purity, with a base patent term currently extending until June 2040, subject to extension to account for time required to fulfill requirements for regulatory approval. Moleculin’s novel drug candidate is being positioned to become the first ever non-cardiotoxic anthracycline to be approved and is currently being developed for the treatment of acute myeloid leukemia (AML) and soft tissue sarcoma lung metastases (STS lung mets). Additional preclinical studies performed at a world-renowned cancer center indicate Annamycin may be a potential treatment for many other types of cancers. The new chemical entity uses a unique lipid-based delivery technology and has shown the potential to be used in a wide range of cancers. In addition to the newly expected Canadian patent and previously issued U.S. and allowed European patents, Moleculin has additional patent applications related to Annamycin pending in the U.S., Europe and in major jurisdictions worldwide.
Walter Klemp, Chairman and CEO of Moleculin, commented, "We remain committed to bolstering our global intellectual property portfolio for Annamycin. This Canadian patent further strengthens our current IP portfolio which includes claims to methods of making our preliposomal Annamycin, in yet another key territory. As we continue to advance our development of Annamycin as a potentially transformative therapeutic candidate for hard-to-treat tumors, building on our global patent protection remains a focus."
Annamycin, also known by its non-proprietary name of naxtarubicin, currently has Fast Track Status and Orphan Drug Designation from the FDA for the treatment of relapsed or refractory AML, in addition to Orphan Drug Designation for the treatment of STS lung mets. Furthermore, Annamycin has Orphan Drug Designation for the treatment of relapsed or refractory AML from the EMA.