Clinical Stage III Gastric Cancer AJCC v8 | Clinical Stage III Gastroesophageal Junction Adenocarcinoma AJCC v8 | Clinical Stage I Esophageal Squamous Cell Carcinoma AJCC v8 | Clinical Stage I Gastric Cancer AJCC v8 | Clinical Stage II Esophageal Adenocarcinoma AJCC v8 | Clinical Stage II Esophageal... and other conditions