Of 393 patients with squamous-cell carcinoma in the thoracic esophagus, 60 were found by histologic examination to have intramural metastasis. Metastases in 50 of these were identified by gross inspection. There appeared to be no preference for location proximal to the primary lesion. Eighteen patients had metastasis to the gastric wall, which suggested the existence of communicating lymphatic channels between the wall of the esophagus and the stomach. All 60 primaty tumors invaded beyond the submucosa. These 60 patients (group A) were compared with a group of matched control patients without intramural metastasis (group B). The tumor size in group A was significantly larger than in group B (p < 0.01). The number of patients with lymph-node metastasis was significantly higher in group A (p < O.Ol), and the average number of positive nodes in group A was greater than in group B (p < 0.01). Recurrent disease in the mediastinal lymph nodes and in the liver is characteristic of group A. The survival curve for patients in group Awas significantly lower than that for group B (p < 0.00 I).
Conventional radiotherapy or chemotherapy after surgery were ineffective in improving prognosis. These results indicate that the presence of intramural metastasis is an important factor to consider when evaluating the prognosis of patients with squarnous-cell carcinoma of the esophagus.