Dr. Uboha explores the potential toxicities related to the MATTERHORN regimen—neoadjuvant durvalumab + FLOT followed by adjuvant durvalumab—in patients with resectable gastric cancer/gastroesophageal junction cancer (GC/GEJC). She stresses that clinicians should remain cognizant of potential toxicities of FLOT, such as neuropathy associated with oxaliplatin and docetaxel, as well as durvalumab. Additionally, Dr. Uboha discusses when dose modifications may be necessary.