Effects of chemotherapy on ultrastructure of oesophageal squamous cell carcinoma.

Seven oesophageal squamous carcinomas, treated with pre-operative chemotherapy (mitomycin-C, ifosfamide and cisplatin-MIC), with a course finishing 21 days prior to resection, were examined by electronmicroscopy. In one treated case detailed light microscopy failed to reveal any tumour. Five of the remaining six tumours showed cytotoxic damage in that apoptosis and unusual necrotic changes were observed in almost all the neoplastic cells. These features were not seen in untreated cases. In four additional cases, who received one pulse of MIC followed by biopsy or resection within 3-6 days, apoptotic changes were very pronounced and extensive and most neoplastic cells presented unusual degeneration with characteristic derangement of the cytoskeleton, destruction of organelles and accumulation of glycogen. The ultrastructural appearance of 18 untreated resected oesophageal squamous carcinomas was studied for comparison with the treated tumours. The study has demonstrated ultrastructural changes resulting from chemotherapy. Results suggest that the regimen is more effective against squamous carcinomas than against adenocarcinomas of the oesophagus, as judged by comparison with the results of a previous study.