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
2083 - PALAESTRA - A phase II trial with short-course radiotherapy followed by chemotherapy as palliative treatment in esophageal adenocarcinoma
Presenter: David Borg
Session: Poster Display session 2
Resources:
Abstract
4317 - Prognostic factors analysis of 343 patients with adenocarcinoma of esophagogastric junction
Presenter: Yixun Lu
Session: Poster Display session 2
Resources:
Abstract
4099 - Effects of preoperative preparation time on efficacy of neoadjuvant chemotherapy (SOX) in patients with advanced gastric cancer
Presenter: Xinxin Wang
Session: Poster Display session 2
Resources:
Abstract
3769 - The prognostic value of higher absolute lymphocyte counts for patients with surgically resected non-advanced gastric cancer
Presenter: Se Jun Park
Session: Poster Display session 2
Resources:
Abstract
1718 - Trastuzumab and pertuzumab added to neoadjuvant chemoradiotherapy in resectable HER2+ esophageal adenocarcinoma patients: an update on survival and predictive biomarkers in the TRAP study
Presenter: Charlotte Stroes
Session: Poster Display session 2
Resources:
Abstract
5403 - Interim analysis of a phase II trial of perioperative chemotherapy plus avelumab in esophagogastric and gastric adenocarcinoma
Presenter: Thierry Alcindor
Session: Poster Display session 2
Resources:
Abstract
591 - Evaluation of the introduction of primary G-CSF prophylaxis to the FLOT chemotherapy regimen.
Presenter: Kelly-Marie Crampton
Session: Poster Display session 2
Resources:
Abstract
1402 - Subgroup analyses of a randomized two-by-two factorial phase II trial comparing neoadjuvant chemotherapy with 2 and 4 courses of cisplatin/S-1 (CS) and docetaxel/cisplatin/S-1 (DCS) as neoadjuvant chemotherapy for locally advanced gastric cancer
Presenter: Tsutomu Hayashi
Session: Poster Display session 2
Resources:
Abstract
3743 - HER2 Copy Number as Predictor of Disease-Free Survival in HER2-Positive Resectable Gastric Cancer
Presenter: Zimin Liu
Session: Poster Display session 2
Resources:
Abstract
2032 - Effect of neoadjuvant chemotherapy on the Programmed Death-1 pathway in esophageal and gastric cancer
Presenter: Maria Svensson
Session: Poster Display session 2
Resources:
Abstract