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Mirna expression signature in the classification of thyroid tumors

a thyroid tumor and expression signature technology, applied in the field of thyroid tumor classification methods, can solve the problems of rapid or irregular heartbeat, nervousness, weight loss, and feeling of being too warm

Inactive Publication Date: 2017-12-14
ROSETTA GENOMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for classifying thyroid lesions as malignant or benign, based on the expression profile of microRNAs. The method involves extracting RNA from a thyroid lesion sample, obtaining a expression profile of microRNAs, applying a classifier algorithm to the expression profile, and discarding the sample if the microRNA levels or a ratio of microRNAs is below or above a threshold. The method can also involve measuring the levels of microRNAs using hybridization or amplification techniques, such as real-time polymerase chain reaction or RT-PCR. The invention also provides isolated nucleic acids, pharmaceutical compositions, vectors, probes, and biochips containing the microRNAs described herein. The use of these microRNAs in the preparation of a medicament is also provided.

Problems solved by technology

The accurate diagnosis of thyroid nodules continues to challenge physicians managing patients with thyroid disease.
This limitation of FNA cytology in the pre-operative diagnosis leads to a clinical need for reliable pre-operative molecular markers to distinguish benign from malignant thyroid nodules.
Overproduction of thyroid hormone (hyperthyroidism) causes rapid or irregular heartbeat, trouble sleeping, nervousness, hunger, weight loss, and a feeling of being too warm.
Unfortunately, in at least 25% of the cases the FNA specimens collected are either inadequate for diagnosis or indeterminable by cytology.
In current medical practice, most patients with indeterminate results undergo surgery, and are subject to all risks and consequences of the surgical procedure.
Follow-up results show that only 25% of the patients operated on are diagnosed with cancer, meaning that 75% of the patients underwent an unnecessary surgical procedure.
Surgery entails significant cost and morbidity.
When examining cytochemical or genetic markers, there is no unique marker that on its own is able to provide reliable results in order to replace the morphologic diagnosis of thyroid lesions.
Nonetheless, numerous are the challenges that remain.

Method used

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  • Mirna expression signature in the classification of thyroid tumors
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  • Mirna expression signature in the classification of thyroid tumors

Examples

Experimental program
Comparison scheme
Effect test

example 1

of microRNA in Pre-Operative Samples

[0292]A pilot study of microRNA profiling was conducted in a few Papanicolaou, Giemsa and Diff-Quick stained smears from ex-vivo FNA biopsy samples in order to ensure feasibility of the methodology. Since FNA smears often have very few cells, providing a minuscule amount of RNA for analysis, e.g. 1-1000 ng, it was first necessary to evaluate whether microRNA would be detectable under such low RNA amounts. Thus, microRNA expression levels of about 2200 individual microRNAs was measured in Giemsa-stained papillary carcinoma and non-papillary carcinoma smears. Five microRNAs (hsa-miR-146b-5p, hsa-miR-31-5p, hsa-miR-222-3p, hsa-miR-221-3p, and hsa-miR-21-5p), previously shown to correlate with papillary carcinoma were found over-represented (upregulated) in the papillary-carcinoma smears. A comparison of microRNA expression between Giemsa-stained papillary carcinoma and non-papillary carcinoma samples, revealed the highly up-regulated microRNA markers...

example 2

ial microRNA Expression Between Malignant and Benign Thyroid Lesions

[0293]The cohort of samples used in the experimental analysis is shown in Table 7 as cohort II. The histological diagnosis assessed ultimately the malignancy or benignity of the thyroid lesions. The cytological classification was based on “The Bethesda System for Reporting Thyroid Cytopathology” (Syed, Z. Ali and Edmund S. Cibas, eds.; DOI 10.1007 / 978-0-387-87666-5_1; Springer Science+Business Media, LLC 2010). The study protocol was approved by the Institutional Review Board (IRB, equivalent to Ethical Review Board) of the contributing institution. Tumor classification was based on the World Health Organization (WHO) guidelines. An additional cohort consisted of 13 thyroid ex-vivo FNA smears, prepared after thyroidectomy, and obtained from the University Milano-Bicocca (Milan, Italy).

[0294]Total RNA (at least 10 ng) was extracted from these samples, and microRNA expression was profiled using custom microarrays cont...

example 3

shing Different Sub-Types of Malignant and Benign Thyroid Lesions

[0296]Expression levels of miRs were compared in 18 follicular adenoma samples and 10 follicular carcinoma samples. microRNAs that were upregulated or downregulated in follicular adenoma relative to follicular carcinoma are presented in Table 4.

TABLE 4miRNAs up- or downregulated in follicular adenoma versus follicularcarcinomaMedianfold-FollicularFollicularmiR namep-valuechangeAUCadenomacarcinomahsa-miR-486-3p2.80E−022.04 (+)0.774.80E+022.40E+02MID-011415.50E−021.91 (+)0.733.50E+021.80E+02hsa-miR-193a-3p2.70E−021.45 (+)0.763.10E+022.20E+02hsa-miR-148b-3p3.90E−021.25 (−)0.714.50E+025.60E+02p-values were calculated using a two-sided (unpaired) Student's t-test.The fold-change represents the ratio between the median values of each group.AUC: Area under the curve when using the miRNAs to classify the two groups.Median: median of expression values (rounded).

[0297]Expression levels of miRs were compared in 18 follicular aden...

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Abstract

The present invention provides a method for classification of thyroid tumors through the analysis of the expression patterns of specific microRNAs in fine needle aspiration samples. Thyroid tumor classification according to a microRNA expression signature allows optimization of diagnosis and treatment, as well as determination of signature-specific therapy.

Description

FIELD OF THE INVENTION[0001]The present invention relates to methods for classification of thyroid tumors. Specifically the invention relates to microRNA molecules associated with specific thyroid tumors.BACKGROUND OF THE INVENTION[0002]The accurate diagnosis of thyroid nodules continues to challenge physicians managing patients with thyroid disease. Patients with cytologically indeterminate nodules are often referred for diagnostic surgery, though most of these nodules prove post-surgery to be benign. This limitation of FNA cytology in the pre-operative diagnosis leads to a clinical need for reliable pre-operative molecular markers to distinguish benign from malignant thyroid nodules. MicroRNAs (miRs) are an important class of regulatory RNAs, which have a profound impact on a wide array of biological processes. These small (typically 18-24 nucleotides long) non-coding RNA molecules can modulate protein expression pattern by promoting RNA degradation, inhibiting mRNA translation, a...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C12Q1/68G06F19/20G06F19/18G16B20/20G16B25/10
CPCC12Q2600/178C12Q2600/158C12Q1/6886G06F19/20G06F19/18C12Q2600/112G16B20/00G16B25/00G16B20/20G16B25/10
Inventor BARNETT-ITZHAKI, ZOHARYANAI, GILA LITHWICKMEIRI, ETISPECTOR, YAELBENJAMIN, HILADROMI, NIR
Owner ROSETTA GENOMICS
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