STCube is a Seoul-based biotechnology company developing precision immunotherapies for difficult-to-treat, resistant and recurrent cancers. Its central program is nelmastobart, described as the first anti-BTN1A1 immune-checkpoint inhibitor, developed through collaboration with institutions including MD Anderson Cancer Center. The company completed its first-in-human Phase 1 trial and is advancing biomarker-driven studies in colorectal and non-small-cell lung cancers.