OBJECTIVES: I. Determine the efficacy and toxicity of neoadjuvant cisplatin, fluorouracil, and docetaxel, and postoperative intraperitoneal floxuridine and leucovorin calcium in patients with locally advanced adenocarcinoma of the stomach or gastroesophageal junction. II. Determine whether molecular markers, including thymidylate synthase, excision repair cross complementing gene, and tubulin isoform 4B, for sensitivity to fluorouracil, cisplatin, and docetaxel, respectively, are predictive of outcome (disease free survival and overall survival) in these patients. III. Determine the quality of life of these patients treated with this regimen.