SUZHOU, China, April 16, 2021 /PRNewswire/ -- Transcenta Holding Limited (Transcenta), a clinical stage global biotherapeutics company with fully-integrated capabilities in discovery, development and manufacturing of antibody-based therapeutics, presented preclinical data of TST005, a bi-functional anti-PD-L1 and TGF-β trap fusion protein, in a poster during the 2021 American Association for Cancer Research (AACR) Virtual Annual Meeting, being held from April 10th to 15th and May 17th to 21st.

Title:
The preclinical characterization of TST005, a bi-functional anti-PD-L1 and TGF-β trap fusion protein

Abstract Number: 972
Poster Number: 917

Session Category:
Antibody Technologies

Session Title:
Experimental and Molecular Therapeutics

Poster launch time: 
April 10th, 2021, 8:30 a.m.ET, U.S. time

About TST005
TST005, is a bi-functional anti-PD-L1 and TGF-β trap fusion protein designed to simultaneously target two immuno-suppressive pathways, transforming growth factor β-(TGF-β) and programmed cell death ligand-1 (PD-L1), that are commonly used by cancer cells to evade the immune system. TST005 consists of a high affinity PD-L1 antibody fused with an engineered TGF-β Receptor Type II protein in its C-terminal. TST005 lacks FcR binding and has reduced risk of FcR mediated killing of PD-L1 expressing effector T cells. TST005's PD-L1 high binding activity and enhanced TGF-β trap stability enables the targeted delivery of TGF-β trap into PD-L1 expressing tumors, thereby minimizing off-target toxicities of systemic inhibition of TGF-β signaling. TST005 displayed potent activity in vitro in reversing TGF-β induced T-cell suppression. In multiple syngeneic tumor models, TST005 induced significant increase of CD8 T-cell infiltration into PD-L1 expressing tumors and displayed dose-dependent tumor growth inhibition. TST005 is well tolerated in non-human primates and displayed a linear PK profile. TST005 is a potential novel bi-functional immunotherapy candidate with improved therapeutic window.