Abstract 2820
Background
Fine-needle aspiration biopsy (FNAB) is the standard diagnostic method of thyroid nodules. However, a fraction of the cytology assessments generates indeterminate results. Our group developed a method based on the relative quantification of three transcripts to aid the diagnosis of thyroid lesions. In this study, we aimed to validate the performance and applicability of this diagnostic test in FNAB.
Methods
Seventy-five prospectively collected FNAB were evaluated for CLDN10, HMGA2 and LAMB3 gene expression (EIF2B1 as reference gene) by RT-qPCR, using the leftover cells inside the needles. A mathematical model previously established was applied and the scores were compared with the Bethesda categories and the final postoperative report.
Results
We demonstrated the feasibility of the molecular test, even with very small yields of RNA. The three genes tested showed higher expression in the conclusive malignant cases (15 Bethesda VI) in relation to the conclusive benign nodules (35 Bethesda II). The application of the diagnostic algorithm allowed the distinction of these samples with 93% sensitivity (14/15) and 100% specificity (35/35). Among the patient with indeterminate nodules (Bethesda III-V), the test was able to correctly discriminate malignant from benign nodules with 71% sensitivity (5/7 tumors) and 100% specificity (4/4 benign lesions). Fourteen indeterminate cases are being followed-up and were not submitted to surgery to date. Furthermore, we observed that larger tumors (>1 cm), presenting lymph node metastasis and extrathyroidal extension were associated with higher algorithm scores (total of 22 malignant cases).
Conclusions
A thyroid diagnostic method based on the analysis of only four genes by RT-qPCR (3 targets and 1 reference) revealed high accuracy and applicability even in very limited FNAB material, presenting also a potential prognostic role.
Clinical trial identification
Editorial acknowledgement
Legal entity responsible for the study
The authors.
Funding
FAPESP.
Disclosure
All authors have declared no conflicts of interest.
Resources from the same session
5203 - Novel fusion genes identified from matched primary and recurred breast cancers by RNA-sequencing
Presenter: Soojeong Choi
Session: Poster Display session 2
Resources:
Abstract
5873 - Association between PIK3CA mutation status and development of brain metastases in HR+/HER2- metastatic breast cancer
Presenter: Donna Fitzgerald
Session: Poster Display session 2
Resources:
Abstract
3588 - The role of AXL as mechanism of resistance to trastuzumab and a prognostic factor in breast cancer HER2 positive: a translational approach.
Presenter: Anna Adam-Artigues
Session: Poster Display session 2
Resources:
Abstract
5640 - Untargeted assessment of tumor fractions in plasma for monitoring and prognostication from metastatic breast cancer patients undergoing systemic treatment
Presenter: Marija Balic
Session: Poster Display session 2
Resources:
Abstract
2616 - Clinical application of mutational analysis in breast cancer patients: the relevance of PIK3CA analysis for precision medicine.
Presenter: Juan Miguel Cejalvo
Session: Poster Display session 2
Resources:
Abstract
3870 - A retrospective gene expression analysis of surgically-removed Breast Cancer Brain Metastasis (BCBM)
Presenter: Meritxell Mallafré-Larrosa
Session: Poster Display session 2
Resources:
Abstract
1240 - Endocrine therapy alone versus targeted combination strategy as first line treatment in elderly patients with hormone receptor-positive advanced breast cancer: meta-analysis of Phase II and III randomized clinical trials
Presenter: Claudia Omarini
Session: Poster Display session 2
Resources:
Abstract
5535 - Alpelisib (ALP) + fulvestrant (FUL) for patients with hormone receptor–positive (HR+), HER2− advanced breast cancer (ABC): management and time course of key adverse events of special interest (AESIs) in SOLAR-1
Presenter: Hope Rugo
Session: Poster Display session 2
Resources:
Abstract
3093 - Changes in Hormone-Receptor status in Luminal breast cancers between primary tumor and metastases: results of the observational cohort GIM-13 AMBRA Study
Presenter: Marina Cazzaniga
Session: Poster Display session 2
Resources:
Abstract
1378 - MONARCH 3: Updated time to chemotherapy and disease progression following abemaciclib plus aromatase inhibitor (AI) in HR+, HER2- advanced breast cancer (ABC)
Presenter: Miguel Martín
Session: Poster Display session 2
Resources:
Abstract