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Papillary and follicular thyroid carcinomas with bone metastases: a series of 39 cases during a period of 18 years.

BACKGROUND
Bone metastases can cause death in patients with papillary or follicular thyroid carcinoma. There is, however, limited information about the clinical presentations and prognoses of patients with papillary and follicular thyroid carcinomas with bone metastases in Taiwan.


MATERIALS AND METHODS
A series of 39 patients with papillary or follicular thyroid carcinomas with bone metastases treated at our center from 1977 through 1995 was retrospectively reviewed to elucidate the clinical presentations and results of treatment of this disease.


RESULTS
The occurrence rate of bone metastasis in papillary and follicular thyroid carcinomas was 4.3%. Of the 39 patients, whose mean age was 57.5 years, 28 (71.8%) had follicular and 11 (28.2%) had papillary carcinomas. Thirty-two patients (82.1%) were female and 7 (17.9%) were male. Twenty-nine patients (74.4%) presented with bone metastases before the thyroid cancers were diagnosed. Bone metastases were detected using radiography in 33 patients and using 131I scans in 28 patients. Thirty-one patients (79.5%) had multiple bone metastases. The spine was the most frequently involved site (53.8%). Three patients were disease-free and 14 patients died during the course of treatment. Using the Kaplan-Meier method, the 5-year survival rate was estimated to be 64.9%.


CONCLUSION
Bone metastasis, although rare in patients with papillary carcinoma, was not very uncommon in patients with follicular carcinoma. Bone metastases occurred more often in older patients. Multiple bone metastases were noted more often than single bone metastasis. Most patients had symptoms and signs resulting from metastatic bone lesions. Although multimodality therapy was tried, the prognoses for most patients with bone metastases were poor.