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Changes in the standard treatment for esophageal cancer in Japan are reflected in the history of consecutive studies conducted by the Japan Esophageal Oncology Group (JEOG), a subgroup of the Japan Clinical Oncology Group (JCOG). Following the era of preoperative radiotherapy in the 1970s, the emphasis in surgical adjuvant therapy shifted from postoperative radiotherapy in the 1980s to postoperative...
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