The ubiquitous fibroblast. Multiple oncogenic potentials with illustrative cases.

The wide range of oncogenic proliferative potentials of the fibroblast is demonstrated with a series of eight patients. Diagnoses included infantile digital fibromatosis, "aggressive fibromatosis," aggressive fibromatosis progressing to poorly differentiated sarcoma, infantile myofibromatosis, recurrent desmoid tumor, fibrosarcoma arising in a keloid, dermatofibrosarcoma protuberans, and malignant fibrous histiocytoma of left atrium. Still other types of fibroblastic tumefactions might have been included. Oncogenic factors that may have been operative in the causation of the lesions presented include: genetic factors, sex-linked factors, hormonal factors, numerous growth factors, and certain viruses, especially retroviruses. Certain fibromatoses in children are commonly self-limited and need only be monitored carefully as the process regresses. Aggressive fibromatosis, on the other hand, can prove fatal if the lesion is not completely resected with a wide margin and, occasionally, the process may become frankly malignant, with metastases. The standard triad of excisional surgery, radiotherapy, and chemotherapy has been used to treat frankly malignant fibrous tumors with variable results.