ERBB2 and gastroesophageal junction adenocarcinoma: The COMPASSION-15 trial confirmed the safety and effectiveness of cadonilimab, a bispecific antibody targeting both programmed death 1 (PD-1) and cytotoxic T lymphocyte antigen-4 (CTLA-4), in treating human epidermal growth factor receptor 2 (HER2) negative advanced gastric or gastroesophageal junction adenocarcinoma (G/GEJA).