Global Stomach Cancer Treatment Market Assessment, By Treatment Type [Immunotherapy, Targeted Therapy, Chemotherapy, Others], By Type [Adenocarcinomas, Gastrointestinal Stromal Tumors (GISTs), Gastroesophageal Junction Cancer], By Drug Class [PD-1/PD-L1 Inhibitors, HER2 Antagonists, VEGFR2 Antagonists, Other Drug Classes], By Route of Administration [Oral, Injectable], By Distribution Channel [Hospital Pharmacies, Specialty and Retail Pharmacies, Others], By Region, Opportunities and Forecast, 2018-2032F