- Adenocarcinoma or squamous cell carcinoma of the esophagus, including the gastroesophageal junction, histologically confirmed, American Joint Committee on Cancer (AJCC) Stage IIA, IIB, III. Additionally, patients with tumors of the lower thoracic esophagus and gastroesophageal junction may have regional lymph node involvement (M1A-Stage IVA), as long as the lymphadenopathy can be entirely encompassed by the radiation field.