Harbour BioMed (HKEX: 02142), a global biopharmaceutical company specializing in novel antibody therapeutics for immunology and oncology, has announced that it will present Phase II clinical data on its anti-CTLA-4 antibody, porustobart (HBM4003), in combination with tislelizumab for microsatellite stable $(MSS)$ metastatic colorectal cancer (mCRC). The presentation will take place at the ESMO Congress 2025 in Berlin, Germany, from October 17-21, 2025. The study, conducted at multiple centers, involved heavily pretreated non-liver metastatic MSS mCRC patients. Preliminary efficacy and safety data will be featured in a poster session. Porustobart, developed using the HCAb Harbour Mice® platform, offers unique properties such as significant Treg cell depletion and optimized pharmacokinetics. The company has observed positive efficacy and safety data in monotherapy and combination trials for various solid tumors.