Predictive Factors for Medullary Thyroid Cancer Aggressiveness

This study is a retrospective study trying to find the predictive factors for medullary thyroid aggressiveness in terms of tumor metastasis and patients' survival. The predictive factors included in this study are central and lateral compartment lymph node metastases as well as distant metastasis up to 1 year postoperatively, while biochemical predictors (meaning ratios such as lymphocyte to monocyte ratio etc and CEA and calcitonin drop levels) and histological predictors (such as nuclear atypia, amyloid, immunohistochemistry, desmoplasia) are included as secondary outcomes. In this study , patients \>18 years old that underwent surgery for medullary thyroid cancer (total thyroidectomy, completion thyroidectomy) +/- central/lateral neck dissection) will be enrolled.