CONTROVERSIES IN THE MANAGEMENT OF MALIGNANT THYMOMA

The management of most thymomas is relatively straightforward: surgica l resection remains the primary mode of therapy, However, the literatu re contains many contradictory points of view regarding histology and pathology, staging and its usefulness, the need for adjuvant therapy, and recently, the place of video-assisted surgery in the treatment of this tumor. This article is not a comprehensive guide to management bu t rather explores several of these controversial areas, Conclusions in clude the following: invasiveness remains the single most consistent f actor in predicting outcome; surgery is the treatment of choice for th ymoma whenever a complete resection can be accomplished; and incomplet e resection may have some advantage over biopsy alone, The preponderan ce of evidence indicates that all thymomas except completely encapsula ted stage I tumors should be treated with postoperative adjuvant radia tion therapy in the hope of reducing the incidence of local relapse, M yasthenia can no longer be considered an adverse prognostic factor in thymoma; it may even confer a survival advantage, but this may be due to the preponderance of early-stage tumors discovered incidentally in myasthenic patients, Other associated autoimmune diseases confer a sur vival disadvantage, Demonstrating the equivalence of minimally invasiv e thoracoscopic approaches to standard thymectomy will take many years of investigation, Some promising reports on response to chemotherapy have led to the development of a phase II intergroup study to assess t he value of chemotherapy in advanced thymoma.