RETROSPECTIVE COHORT STUDY: DIFFERENCES AND SIMILARITIES BETWEEN SPORADIC AND FAMILIAL PAPILLARY THYROID CARCINOMA

INTRODUCTION There is a lot of controversy around the study of the familial papillary thyroid carcinoma (CPFT), which has a different behaviour than sporadic. The aim of this investigation is to establish the differences and similarities between sporadic papillary thyroid carcinoma and the familial one in order to determine if the familial type is a more aggressive clinical entity than sporadic. MATERIAL AND METHODS A retrospective cohort study in 231 patients with papillary thyroid carcinoma (CPT) from 2006 to 2018. One group was established according to the presence of two or more relatives as CPFT (n = 46) and the other group were the sporadic cases (n = 185). Throughout this study the clinical-pathological characteristics of both groups were compared based on the analysis of twenty-one variables. RESULTS After having carried out this investigation, statistically significant differences have only been found in the vascular invasion (p < 0.001), presenting 3.8% in the sporadic group compared to the 21.7% found in the CPFT with an Odds Ratio of 7.6. CONCLUSIONS Based on our experience, patients with CPFT present a higher frequency of multifocal neoplasia, capsular invasion, vascular invasion, lymph node invasion and recurrence than sporadic CPT. However, these differences were only significant while analyzing the vascular invasion variable. Although the results of our study have been unable to prove that the CPFT is more aggressive than sporadic CPT, we recommend performing periodic ultrasounds such as the screening of the members of the families with CPFT. Finally, we conclude that more studies are needed.