The study, which was published in the March 2012 edition of the Journal of Surgical Oncology as the article “Preoperative serum thyroglobulin concentration is an independent predictive factor of malignancy in follicular neoplasms of the thyroid gland,” was a retrospective study. Researchers reviewed the charts of 388 patients with FN. There were 314 females and 74 males; the mean age was 50 years (range: 9-81 years). Those 388 patients had been surgically treated between 1988 and 2009.
Using the chi-squared test and multivariate logistic regression, predictive factors for FN malignancy were identified.
The chart review revealed that the histopathological diagnoses for these 388 patients were:
The multivariate logistic regression showed that independent predictors of malignancy were age (odds ratio [OR] 1.88; p = 0.008), solitary tumor (OR 1.72; p = 0.037), and thyroglobulin (Tg) concentration (OR 2.36; p = 0.001).
A malignant FN was more common in patients who were > 45 years, had a solitary tumor, and pre-operative serum Tg level of > 400 ng/mL.
The researchers concluded that taking the serum Tg concentration may be helpful in trying to diagnose if a patient has a malignant FN. Tg concentration, along with age and presence of a solitary tumor, is an independent predictor of malignancy, so checking the concentration may reduce the number of patients who need to undergo diagnostic thyroidectomies.