Profiling and comparative analysis of genomic alterations and miRNA expression in benign and malignant thyroid tumors using histological and cytological specimens will be performed. Obtained information is necessary to create a molecular test to refine the cancer risk of cytologically indeterminate thyroid nodules.

This is an non-randomised retrospective study consisting of 2 parts. Part A. Histological specimens (formalin fixed paraffin embedded) of patients who were operated on for benign and malignant thyroid disorders will undergo molecular testing to create a molecular profile of thyroid nodules characteristic of Belarusian population.

Part B. Fixed cytological smears of indeterminate thyroid nodules (categories III, IV and V according to Bethesda scoring system) of operated patients will undergo molecular testing to evaluate the possibility and reliability of molecular testing of fixed cytological smears using available assays.

Inclusion Criteria:

Patients operated on for malignant and benign thyroid tumors. Age is greater than or equal to 18 years old.

Exclusion Criteria:

no

Population of the Republic of Belarus

IPD that underlie results in a publication

after summary data are published

IPD will be shared through publications