Factors that predict metastasis of papillary and follicular thyroid cancers in Taiwan

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Abstract
The purpose of this study is to explore the relationship of postoperative thyroglobulin level and other clinical factors with tumor metastasis. Analysis of 281 pathologic lesions verified patients with papillary and follicular thyroid cancer who received their primary treatment at Chang Gung Memorial Hospital. Clinical information-including postoperative thyroglobulin levels, age, sex, primary tumor size, clinical staging, surgical methods, surgical findings, chest x-ray findings, and 131I uptake-were stored in the computer. Actual survival rate and univariate and multivariate analyses of these factors with the relationship of distant metastases were undertaken. Twenty-three patients in this study died of distant metastases from the thyroid cancer. Of these patients, 30.4% were older than 60 years. In contrast only 8.5% of patients in the survival group were older than 60 years (p < 0.05 in chi2). All of the papillary thyroid cancer patients with distant metastases displayed thyroglobulin levels higher than 25 ng/ml, but only 24% (41 of 173 cases) of those without distant metastases had thyroglobulin levels higher than 25 ng/ml. In 12 follicular thyroid cancer patients with distant metastases, 11 patients' serum thyroglobulin levels were higher than 25 ng/ml. In contrast, only 7 of 33 patients with follicular thyroid cancer without distant metastases displayed similar thyroglobulin levels. Univariate analysis revealed that age, postoperative thyroglobulin levels, chest x-ray findings, pathologic type, and tumor size are associated with distant metastases. One-month postoperative serum thyroglobulin level could be used as a prognostic factor for papillary and follicular thyroid cancer patients with distant metastases.

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