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Method for constructing tumor screening modeland and application of tumor screening model

A technology for tumor screening and construction methods, applied in the fields of character and pattern recognition, genomics, instruments, etc., which can solve the problems of not being satisfied and not being included in the cohort of early tumor patients

Pending Publication Date: 2021-09-07
BERRY ONCOLOGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this article did not include a cohort of patients with early-stage tumors, so whether the above characteristics can be used for the diagnosis and screening of early-stage patients is not yet conclusive
[0007] From the perspective of the existing technology, for early screening and diagnosis of tumors, each research direction has its own advantages and disadvantages in terms of sensitivity and specificity, but none of them have achieved ideal results that meet people's needs.

Method used

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  • Method for constructing tumor screening modeland and application of tumor screening model
  • Method for constructing tumor screening modeland and application of tumor screening model
  • Method for constructing tumor screening modeland and application of tumor screening model

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] 3234 participants were recruited, including 508 patients with liver cancer (HCC) from two centers, 2250 patients with liver cirrhosis (LC) from 13 centers, and 476 healthy controls (NC). According to pathological diagnosis, 27 liver cancer samples were excluded, and 3 cases of liver cirrhosis were excluded based on MRI and enhanced CT. The number of finalized participants was 3204 cases ( figure 1 ).

[0059] Take 3ml of peripheral blood from each participant, collect and store it in Streck cell-free DNA blood collection tubes, use Eppendorf centrifuges (5810R and 5427R, German), and centrifuge at a low speed of 1600g for 10min at a low temperature of 4°C, and only take the supernatant ; Then centrifuge at a high speed of 16000g for 10min, and take the supernatant to obtain a plasma sample. The cfDNA in the plasma was then extracted with the kit MagMAX Cell-Free DNA Isolation Kit (Thermo) and a nucleic acid extractor (Thermo Kingfisher FLEX, USA). The concentration o...

Embodiment 2

[0061] 5-Hydroxymethylcytosine sequencing (5hmc-seq) was performed on all participants' cfDNA samples prepared in Example 1. The sequencing process is as follows:

[0062] (1) HomeSeq library construction and on-machine sequencing: Take 5ng cfDNA, mix it with 4pg internal reference DNA mixture (130bp), and use Enzymatics (USA) end repair plus A-tailing kit (5X ER / A-Tailing Enzyme Mix) , and the sequencing linker ligation kit (WGS Ligase) to construct the pre-library, so that the library has a structure that can be sequenced on the Illumina NovaSeq6000 sequencer. After ligation, AMPure XP beads (Beckman) were used for purification, and the library was collected by elution with EB buffer (Qiagen). The pre-library DNA reacted with uridine-6-azide-glucose diphosphate (UDP-6-azide-glucose, Jena Bioscience) under the action of T4 Phageβ-glucosyltransferase (NEB) In the reaction, the azide group of UDP-6-N3-Glc is transferred to 5hmC to form 5gmC-N3 (that is, 5hmC that has been tra...

Embodiment 3

[0065] Low-depth whole-genome sequencing was performed on the cfDNA samples of all participants prepared in Example 1. The sequencing process is as follows:

[0066](1) WGS library construction and on-machine sequencing: Take 5 ng of cfDNA to construct a pre-library with an Enzymatics (USA) related kit, and use the Enzymatics (USA) end repair plus A tail kit (5X ER / A- Tailing Enzyme Mix), the step of adding adapters uses the sequencing adapter ligation kit (WGS Ligase), and the adapter sequence is suitable for the Illumina NovaSeq 6000 sequencing platform. The adapters were ligated and purified using XP magnetic beads (Agencourt AMPure XPbeads, Beckman Coulter). The concentration of WGS library was determined by qPCR (KAPA Library Quant Kit, Roche), and the library size was determined by Fragment Analyzer (Agilent, USA). Afterwards, paired-end 150bp sequencing was performed on the IlluminaNovaSeq 6000 sequencing platform, and the average data volume of a single sample was 2X...

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Abstract

The invention discloses a method for constructing a tumor screening model, which comprises the following steps of: performing classification model construction on a single classification index by adopting a support vector machine to obtain a prediction score of each index on a sample, and integrating the scores by using a logistic regression model to obtain the tumor screening model. The invention also provides a cancer screening, risk prediction and / or diagnosis method of the tumor screening model constructed based on the method, and a related kit, system, device, computer readable storage medium and equipment. Accurate screening of cancers of each stage, including early cancers, is realized.

Description

technical field [0001] The invention belongs to the technical field of gene detection, and in particular relates to a method for constructing a tumor screening model and a method, system, device, and computer-readable storage medium for cancer screening, risk prediction and / or diagnosis based on the model constructed by the method ,equipment. Background technique [0002] There are nearly 20 million new cancer cases and nearly 10 million cancer deaths every year in the world, and the cancer prevalence rate in my country is at the upper middle level in the world. WHO believes that one third of cancers can be cured with early detection. Compared with late-stage cancers, early-stage cancers have not metastasized and are easier to remove through surgery, radiotherapy, chemotherapy, etc. Treatment interventions in the early stages of cancer can help increase patients' chances of survival, reduce pain, and reduce economic burden. At present, there is no effective treatment for a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G16B20/50G16B40/00G06K9/62G06F17/18
CPCG16B20/50G16B40/00G06F17/18G06F18/2411G06F18/2415
Inventor 孙福明白健张清政吴琳
Owner BERRY ONCOLOGY CO LTD
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