Abstract
The potential benefits and long-term complications of radiotherapy treatment for malignant thymoma are unclear. This is a retrospective analysis of outcome in patients with malignant thymoma from the Surveillance, Epidemiology, and End Results database between 1973 and 2005. Of the 1987 patients identified, 1334 were analyzed. Patients were categorized according to the Masaoka staging system as stage I to IIA, IIB or III to IV. The primary end points were overall survival, cardiac mortality, and the development of secondary malignancies. Patients received surgery and radiation (50%), surgery alone (26%), radiation alone (12%), or no treatment (12%). The median follow-up time for survivors was 65 months (range, 1-361 months). There was no significant increase in the 12-year cumulative incidence rate of death from heart disease (10.2% radiation versus 7.5% no radiation, p = 0.83) or incidence of secondary malignancies (11.7% versus 12.4%, p = 0.70) with radiation. Compared with surgery alone, adjuvant radiation significantly improved overall survival in patients with stage III to IV disease (p = 0.04) and demonstrated a nonsignificant trend in patients with stage IIB disease (p = 0.09). However, after excluding patients surviving...Continue Reading
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