Ava6103 Vs Enhertu21 Apr 2026 22:30
Conclusions for 6103. Reads very well… I’ll give it a strong buy.
• AVA6103 is the second pre|CISION® clinical candidate and is based on the novel sustained
release mechanism that provides for prolonged release of payload directly in the tumor,
minimizing systemic exposure via a specific cleavage of the peptide by Fibroblast
Activation Protein-α (FAP)
• AVA6103 shows robust and durable complete responses in a number of PDX models with
expression of FAP only on invading murine fibroblasts of varying levels of expression
• Topo I payload delivery studies comparing exatecan delivery from AVA6103 and deruxtecan
delivery from Enhertu® demonstrate three key differences in the PK of the payload: 1). more
rapid tumor penetration and payload release with AVA6103; 2). tumor Cmax of more than
one log higher with AVA6103 v Enhertu®; and 3). TSI of 3X higher with AVA6103 v Enhertu®
• These preclinical data suggest the sustained release mechanism has optimized payload
delivery with a high intratumoral concentration and prolonged exposure of released payload
in the tumor, coupled with limited systemic exposure of the released payload
• The pre|CISION® peptide is cleaved only in the presence of membrane-bound FAP
expressed on the cell surface of cancer associated fibroblasts (CAFs), and active exatecan is
released in the extracellular space. This mechanism masks the toxic effects of a payload in
healthy tissues and mediates specific delivery of exatecan to the tumor
• AVA6103 is being evaluated in the FOCUS-01 Phase 1 trial (FAP-Exd in Oncologic Cancers
with Unmet needS), with first dosing in March 2026. The trial is being conducted in six
indications, including SCLC, PDAC, Gastric/GEJ, Cervical and Vulvar, CRC, and HR+ BrCa