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We report an 80-year-old Japanese male with four primary malignant tumors: malignant melanoma, prostatic cancer, malignant lymphoma, and renal cell carcinoma, which occurred in that respective order. The combination of malignant melanoma and malignant lymphoma is rare. The patient was treated with BeG after an operation for malignant melanoma. He was also treated with cobalt 60 irradiation after an operation for prostatic cancer. We also discuss other reports of multiple malignant tumors and suggest some possible causes of this patient's primary malignant tumors.

The detection of those post-burn scars which have become established pre-malignant lesions is difficult. I describe a highly sensitive enzyme-linked immunosorbent assay for fibronectin (FN) production by fibroblasts from scar tissue. The amount of FN produced by fibroblasts from scar tissue adjacent to an area of squamous cell carcinoma was found to be 30 times that produced by fibroblasts from normal scar tissue. Thus, this method may be a useful indicator of scars which are pre-malignant.