Evidence map›Paper›PMID 33669856›Full record

ArticleGenes2021

Detection of Somatic Mutations with ddPCR from Liquid Biopsy of Colorectal Cancer Patients.

Uršula Prosenc Zmrzljak, Rok Košir, Zoran Krivokapić, Dragica Radojković, Aleksandra Nikolić

Open access · goldAbstract read
In one paragraph

Article in Genes, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers.

0numbers the graph read from it
0cells of the map it votes in
16citing papers in PubMed
1.5field-weighted citation impact, top 20% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

16 citing papers in PubMed, 22 citations in OpenAlex.

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  4. Detection ofOncology research · 2026
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  16. Cancer control : journal of the Moffitt Cancer Center
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors at 3 institutions in 2 countries.

Uršula Prosenc ZmrzljakMolecular Biology Laboratory, BIA Separations CRO, Labena Ltd, 1000 Ljubljana, Slovenia.ORCID 0000-0002-9034-790X
Rok KoširMolecular Biology Laboratory, BIA Separations CRO, Labena Ltd, 1000 Ljubljana, Slovenia.ORCID 0000-0002-1197-9627
Zoran KrivokapićDepartment of Colorectal Diseases, Clinic for Digestive Surgery, First Surgical Clinic, Clinical Center of Serbia, 11000 Belgrade, Serbia.
Dragica RadojkovićInstitute of Molecular Genetics and Genetic Engineering, University of Belgrade, 11000 Belgrade, Serbia.
Aleksandra NikolićInstitute of Molecular Genetics and Genetic Engineering, University of Belgrade, 11000 Belgrade, Serbia.
BIA Separations (Slovenia) · SIUniversity of Belgrade · RSSerbian Academy of Sciences and Arts · RS

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Liquid biopsy and cell-free DNA (cfDNA) show great promise in cancer diagnostics. In this study, we designed a custom droplet digital PCR (ddPCR) assay for the quantification and quality control of cfDNA isolated from serum. The assay was validated on a group of locally advanced colorectal cancer (CRC) patients and two control groups-patients with hemorrhoids and healthy individuals. The assay shows a high correlation with Qubit measurement (r = 0.976) but offers a higher dynamic range. Mean concentrations of cfDNA were 12.36 ng/µL, 5.17 ng/µL, and 0.29 ng/µL for CRC, hemorrhoid patients, and healthy controls, respectively. The quality of cfDNA was assessed with the measurement of B-cell DNA contamination. On a subset of CRC patients, we compared the mutation status on KRAS (G12A, G12D, G12V, G13D) and BRAF (V600E) genes in the primary tumor and cfDNA isolated from the serum. A total of 70.6% of primary tumor samples were mutated, and the mean fractional abundance of mutations was 9.50%. The matching serum samples were mutated in 38% cases with an average fractional abundance of 0.23%. We conclude that any decisions based solely on the amount of cfDNA present in patient serum must be interpreted carefully and in the context of co-morbidities. This study explores the potential of ddPCR somatic mutations detection from liquid biopsy as a supplement to tissue biopsy in targeted personalized CRC patient management.

Indexed as

AdultAgedAged, 80 and overBiomarkers, TumorCell-Free Nucleic AcidsCirculating Tumor DNAColorectal NeoplasmsFemaleHumansLiquid BiopsyMaleMiddle AgedMutationProto-Oncogene Proteins B-rafProto-Oncogene Proteins p21(ras)Biomarkers, TumorBRAF protein, humanCell-Free Nucleic AcidsCirculating Tumor DNAKRAS protein, humanProto-Oncogene Proteins B-rafProto-Oncogene Proteins p21(ras)BRAFcell-free DNAcolorectal cancerddPCRhemorrhoidsKRASliquid biopsysomatic mutations

Identifiers

PMID33669856
PMCPMC7923234
OpenAlexW3129467510

What OpenQuestion holds

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LicenceCC BY
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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.