OBJECTIVES: I. Compare overall five-year survival rates and treatment failures in patients receiving neoadjuvant cisplatin (CDDP) plus fluorouracil (5-FU) with concomitant radiotherapy followed by surgical resection versus patients receiving surgery alone. II. Assess and compare the toxicities of each approach. III. Compare the incidence and pattern of local (gastric or esophageal bed or regional lymph nodes) and distant (supraclavicular lymph node, liver, peritoneal carcinomatosis, or lung, brain, etc.) recurrence. IV. Evaluate the prognostic ability of noninvasive and minimally invasive pretreatment staging with regard to survival and recurrence. V. Evaluate the ability of preresection adjuvant chemotherapy with concomitant radiation therapy to render tumors to lower stages. VI. Evaluate the impact of lymph nodes on survival and recurrence.