[Malignant hemangioendothelioma of the thyroid gland: new results on pathogenesis, therapy and prognosis].

Background: Malignant hemangioendothelioma of the thyroid is a rare tumor predominantly described in areas with endemic goiter like the Alpine regions. The estimated incidence of the disease is between 0.15 and 0.25 per 100,000 inhabitants per year for Western Austria. The prognosis is reported to be dismal.

Materials And Methods: Between 1982 and 1995, 10 cases with immunohistochemically confirmed malignant hemangioendotheliomas of the thyroid were referred to our department for postoperative or palliative treatment. Two patients with clear margins at surgery received no adjuvant radiotherapy and were only observed. By surgery, clear margins (R-0 resection) were achieved in 5, microscopic residuals (R-1) were left in 3, and gross residual disease in 1 patient. One patient had an inoperable primary tumor. Postoperative radiotherapy was administered in 6 cases, 4 of them additionally received the radiosensitizer razoxane. Total tumor doses ranged between 58 and 65 Gy.

Results: Local tumor control was achieved in 9 of 10 patients; 4 of 10 lived longer than 4 years. The median survival time has not yet been reached and is presently between 7.5 and 21+ months.--Noteworthy is a complete regression of 2 lung metastases in a 72-year-old man by a combination of vindesine, razoxane and radiotherapy. The patient is still in complete remission under a maintenance therapy with vindesine and razoxane since 14 months.--It may also be of interest that 4 of the 10 patients were strongly exposed to vinyl chloride and other polymeric materials during their occupational life.

Conclusions: This small series may indicate that the outcome of this disease may not be uniformly deleterious, and that the resistance to radiotherapy reported in the literature may be questioned.--The data offer new evidence of the occurrence of vinyl chloride-induced angiosarcomas outside the liver, and support observations which have already been published in case reports.