Prospective Registry Study of Multimodality Therapy for Oligometastatic Adenocarcinoma of the Esophagus or Gastroesophageal Junction

Inclusion Criteria: * Newly diagnosed stage IV adenocarcinoma of the esophagus or GEJ with OMD at the time of diagnosis, defined as the following: * Retroperitoneal lymph nodes (e.g., para-aortal, intra-aorto-caval, parapancreatic, or mesenterial lymph node) * Liver * Lung * Extra-abdominal lymph nodes (e.g., supraclavicular or cervical lymph nodes) * Adrenal gland * Unilateral or bilateral ovarian metastases (in the absence of gross or microscopic peritoneal disease \[positive cytology\]) * Bone * ≤2 sites of disease (excluding the primary tumor and regional lymph nodes) * ≤3 tumors within each organ system * ≤5 metastases * All nonregional lymph nodes (including cervical, supraclavicular, and retroperitoneal nodal disease) are considered 1 discrete lesion * Satellite lesions in the primary esophageal malignancy, such as skipped esophageal primaries, are not considered metastatic sites * All sites of disease must be amenable to complete local therapy after systemic therapy, according to the treating physician. Treatment modalities include: * Surgery * Definitive chemoradiation * Stereotactic radiation * Ablation or similar techniques (e.g., irreversible electroporation) * Age ≥18 years Exclusion Criteria: * Presence of metastases, at the time of diagnosis, to the following: * Peritoneum, including positive peritoneal lavage (on the basis of baseline diagnostic laparoscopy to rule out gross disease and positive peritoneal lavage cytology; laparoscopy may be omitted for patients in whom all sites of disease are above the diaphragm) * Malignant pleural effusion * Brain metastases or leptomeningeal disease * Other sites not specifically noted must be reviewed and approved by the PIs * Any site of disease that is not amenable to definitive local therapy * Unfit for best systemic therapy * Metachronous OMD * Secondary primary cancer, with the exclusion of basal cell carcinoma of the skin * Pregnant, lactating, or intending to become pregnant * Unwilling to provide informed consent