RE: Eli Lilly29 Apr 2026 10:09
From Grok :
In 2024, Hemogenyx announced a new and improved version of CDX, developed using Lonza’s bYlok bispecific pairing technology. This version aimed to enhance the original candidate’s properties for better performance in relapsed/refractory AML. 
Lilly’s IP affects this improved version in the following ways:
• Enabling access and freedom to operate: The licensed Lilly IP covers aspects of the original CDX (sequences, methods, or related know-how from the collaboration). Without the license, developing or commercializing derivatives or improvements built on that foundation could risk infringement claims. The exclusive license provides Hemogenyx with the legal right to build upon and improve the asset. 
• Limited scope to Lilly’s contributions: Lilly’s IP is tied to what was developed/validated during the collaboration, not necessarily every aspect of the new improved version. Hemogenyx has its own patent portfolio for CDX, including:
• A core U.S. patent (US 11,021,536 B2) on CDX bi-specific antibodies.
• Additional patents/applications on composition of matter for novel sequences (some stemming from the Lilly collaboration, e.g., WO/2023/023489), methods of use, and conditioning approaches.
• Grants in China and further U.S. protections. 
The improved version likely incorporates Hemogenyx’s own innovations (e.g., via bYlok technology) and new sequences, strengthening Hemogenyx’s independent IP position.
• Financial and contractual obligations: The license imposes ongoing payments (milestones) and sub-licensing sharing, which apply to exploitation of the licensed IP—even in improved forms derived from the original program. This creates a modest royalty-like or milestone burden but is described by Hemogenyx as opening a “low-cost path” to clinical proof-of-concept compared to alternatives. 
• No blocking effect reported: Public announcements and investor materials frame the Lilly license as facilitative rather than restrictive. Hemogenyx emphasizes its “strong Intellectual Property position and know-how” overall, with the Lilly license providing validation and cleared rights from the Big Pharma partner. There are no indications of disputes, additional restrictions, or that Lilly retains rights that block the improved CDX. 
Summary of Net Effect
Lilly’s IP primarily facilitates rather than hinders the improved CDX by granting Hemogenyx exclusive rights to necessary collaboration-derived IP, reducing legal risks and enabling continued development/commercialization. It adds defined financial obligations but is not portrayed as a major ongoing limitation. Hemogenyx’s own patents (on sequences, methods, etc.) provide additional layers of protection for the improvements.