Genomic differences in benign and malignant follicular thyroid tumours using 1-Mb array-comparative genomic...

Area of Science:

• Genomics
• Oncology
• Pathology

Background:

• Follicular thyroid tumors lack objective markers to differentiate benign from malignant types.
• Current diagnostic methods can lead to unnecessary surgeries and associated costs.
• Objective genomic markers are needed to improve diagnostic accuracy and patient outcomes.

Purpose of the Study:

• To identify genomic markers for differentiating benign and malignant follicular thyroid tumors.
• To investigate copy number alterations using 1-megabase array comparative genomic hybridization (1Mb-aCGH).

Main Methods:

• DNA extraction from formalin-fixed paraffin-embedded thyroid tumor specimens.
• Copy number analysis using in-house 1Mb-aCGH.
• Analysis of genomic data from 25 adenomas and 17 carcinomas.

Main Results:

• Recurrent copy number changes distinguishing benign and malignant tumors included +1p34.2-36.33, +1q, +13q12.11-14.3, +14q22.1-32.33, +20q, and -22.
• +20q was more sensitive for minimally invasive carcinomas, while +13q and +14q were more sensitive for widely invasive cancers.
• Specific copy number changes differentiated aneuploid adenomas from carcinomas in the context of aneuploidy.

Conclusions:

• This study is the first to use 1Mb-aCGH for follicular thyroid tumor analysis.
• Identified copy number alterations show potential as diagnostic markers.
• Further research with larger sample sizes is warranted to validate these genomic findings.