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The Annals of Oncology Publishes Results of Phase II Study of Sacituzumab Tirumotecan Monotherapy for Urothelial Carcinoma

Sac-TMT uses a novel linker and a belotecan-derivative payload with a 7.4 drug-to-antibody ratio to target TROP2 in advanced solid tumors, aiming to address unmet medical needs globally.

  • Kelun-Biotech is developing Sac-TMT, a sacituzumab tirumotecan-like human anti-TROP2 ADC targeting advanced solid tumors including NSCLC, breast, gastric and gynecological tumors.
  • Kelun-Biotech's strategy aims to address unmet needs in China and globally, with more than 30 ongoing projects, including one in NDA and over 10 in clinical development.
  • The ADC binds TROP2 on tumor cells and Sac-TMT's recombinant anti-TROP2 humanized monoclonal antibodies are endocytosed, releasing KL610023, a topoisomerase I inhibitor, intracellularly and into the tumor microenvironment.
  • With marketed ADCs and clinical assets, Kelun-Biotech states it has 4 ADC projects approved for marketing and the OptiDC platform.
  • Designed with a high DAR and novel linker, Sac-TMT conjugates a belotecan-derivative payload at a drug-to-antibody ratio of 7.4, while the membrane-permeable KL610023 may enable a bystander effect.
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Charleston Gazette-Mail broke the news in Charleston, United States on Friday, November 28, 2025.
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