Ono's BMS-Partnered Oral Gastric Cancer Drug Meets Primary Endpoint in Phase 2 Trial on October 10, 2025 Advanced phase Bristol-Myers Squibb EP4 antagonist EP4 Antagonist ONO-4578 Episodic HER2-negative Malignant neoplasm of stomach nivolumab Opdivo Pharmacotherapy Phase 2 Progression-Free Survival +