Liquid biopsy

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Liquid biopsy
Synonyms Fluid biopsy
Purposeanalysis of non-solid biological tissue

A liquid biopsy, also known as fluid biopsy or fluid phase biopsy, is the sampling and analysis of non-solid biological tissue, primarily blood. [1] [2] Like traditional biopsy, this type of technique is mainly used as a diagnostic and monitoring tool for diseases such as cancer, with the added benefit of being largely non-invasive. Liquid biopsies may also be used to validate the efficiency of a cancer treatment drug by taking multiple samples in the span of a few weeks. The technology may also prove beneficial for patients after treatment to monitor relapse. [3]

Contents

The clinical implementation of liquid biopsies is not yet widespread but is becoming standard of care in some areas. [4]

Liquid biopsy refers to the molecular analysis in biological fluids of nucleic acids, subcellular structures, especially exosomes, and, in the context of cancer, circulating tumor cells. [5]

Types

There are several types of liquid biopsy methods; method selection depends on the condition that is being studied.

DiseaseTissue sampledSampling procedureInvasivenessSubstance isolatedIsolation and detection methodAnalysisRefs
Cancer (various)Blood Phlebotomy Minimally invasive Circulating tumor cells (CTCs)Various (e.g. CellSearch, RosetteStep, Dynabeads)Flow cytometry, nucleic acid extraction, immunocytochemistry, functional assays [6] [7] [8] [9]
Cancer (various)BloodPhlebotomyMinimally invasive Circulating tumor DNA (ctDNA) DNA extraction Next-generation sequencing [10] [11] [12]
Urothelial carcinoma UrineUrine collectionNon-invasiveUrinary tumor DNA (utDNA)DNA extractionNext-generation sequencing [13] [14]
Non-urological cancersUrineUrine collectionNon-invasiveUrine proteins, metabolites HPLC-MS Proteomics, metabolomics [15] [16]
Bladder and prostate cancerUrineUrine collectionNon-invasiveExfoliated cancer cells Urinalysis Fluorescence in situ hybridization [17] [18]
Heart attack BloodPhlebotomyMinimally invasive Circulating endothelial cells (CECs)Various (e.g. CellSearch, HD-CEC)Flow cytometry [19]
Neurological diseases Cerebrospinal fluid Lumbar puncture InvasiveCSF proteins, nucleic acidsVarious ELISA, multiplex assay, next-generation sequencing [20] [21]
Prenatal diagnosis Blood (maternal)PhlebotomyMinimally invasive Cell-free fetal DNA (cffDNA)DNA extraction Karyotyping, fluorescent in situ hybridization [22]
Prenatal diagnosisBlood (maternal)PhlebotomyMinimally invasiveFetal cells in maternal blood (FCMB)Flow cytometryKaryotyping, fluorescent in situ hybridization [23]
Prenatal diagnosisBlood (umbilical cord) Cordocentesis InvasiveUmbilical blood cells and moleculesVariousKaryotyping, blood typing, blood tests, Kleihauer–Betke test, flow cytometry [24]
Prenatal diagnosis Amniotic fluid Amniocentesis InvasiveAmniotic fluid cells and moleculesVariousKaryotyping, blood typing, L/S ratio, S/A ratio [25]

A wide variety of biomarkers may be studied to detect or monitor other diseases. For example, isolation of protoporphyrin IX from blood samples can be used as a diagnostic tool for atherosclerosis. [26] Cancer biomarkers in the blood include PSA (prostate cancer), CA19-9 (pancreatic cancer) and CA-125 (ovarian cancer).

Mechanism

Circulating tumor DNA (ctDNA) refers to DNA released by cancerous cells into the blood stream. [27] [28] Cancer mutations in ctDNA mirror those found in traditional tumor biopsies, which allows them to be used as molecular biomarkers to track the disease. [29] [30] These tests can have sensitive limits of detection, allowing monitoring of minimal residual disease after treatment. Scientists can purify and analyze ctDNA using next-generation sequencing (NGS) or PCR-based methods such as digital PCR. [31] NGS-based methods provide a comprehensive view of a cancer’s genetic makeup and is especially useful in diagnosis while digital PCR offers a more targeted approach especially well-suited for detecting minimal residual disease and for monitoring treatment response and disease progression. [32] [33] Recent progress in epigenetics has expanded the use of liquid biopsy for the detection of early-stage cancers, including by approaches such as Cancer Likelihood in Plasma (CLiP) . [34]

Liquid biopsies can detect changes in tumor burden months or years before conventional imaging tests can, making them suitable for early tumor detection, monitoring, and detection of resistance mutations. [35] [36] [37] The increase in the adoption of NGS in various research fields, advancement in NGS, and increase in the adoption of personalized medicine are expected to drive growth in the global liquid biopsy market. [38]

Clinical application

In cancer, liquid biopsy can be used for either multi-cancer screening tests, [39] when solid tumor biopsies are not possible, to compare different treatments as part of clinical trials, to inform decisions for doctors/patients on which precision medicine treatment to select, and for minimal residual disease detection (disease monitoring). Liquid biopsy of circulating tumor DNA for EGFR-mutated lung cancer is approved by the FDA. [40]

The CellSearch method for enumeration of circulating tumor cells in metastatic breast, metastatic colon, and metastatic prostate cancer has been validated and approved by the FDA as a useful prognostic method. [41]

See also

Related Research Articles

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References

  1. ↑ Alix-Panabières, Catherine; Pantel, Klaus (January 2013). "Circulating tumor cells: liquid biopsy of cancer". Clinical Chemistry. 59 (1): 110–118. doi: 10.1373/clinchem.2012.194258 . ISSN   1530-8561. PMID   23014601.
  2. ↑ Crowley, Emily; Di Nicolantonio, Federica; Loupakis, Fotios; Bardelli, Alberto (9 July 2013). "Liquid biopsy: monitoring cancer-genetics in the blood". Nature Reviews Clinical Oncology. 10 (8): 472–484. doi:10.1038/nrclinonc.2013.110. PMID   23836314. S2CID   25537784.
  3. ↑ "Understanding cancer's unruly origins helps early diagnosis". The Economist. September 14, 2017. Retrieved 2017-09-29.
  4. ↑ Gingras, Isabelle; Salgado, Roberto; Ignatiadis, Michail (November 2015). "Liquid biopsy: will it be the 'magic tool' for monitoring response of solid tumors to anticancer therapies?". Current Opinion in Oncology. 27 (6): 560–567. doi:10.1097/CCO.0000000000000223. PMID   26335664. S2CID   13339984.
  5. ↑ "Liquid Biopsy - an overview | ScienceDirect Topics". www.sciencedirect.com. Retrieved 2023-11-08.
  6. ↑ Peeters, D J E; De Laere, B; Van den Eynden, G G; Van Laere, S J; Rothé, F; Ignatiadis, M; Sieuwerts, A M; Lambrechts, D; Rutten, A; van Dam, P A; Pauwels, P; Peeters, M; Vermeulen, P B; Dirix, L Y (April 2013). "Semiautomated isolation and molecular characterisation of single or highly purified tumour cells from CellSearch enriched blood samples using dielectrophoretic cell sorting". British Journal of Cancer. 108 (6): 1358–1367. doi:10.1038/bjc.2013.92. PMC   3619252 . PMID   23470469.
  7. ↑ Agerbæk, Mette Ø.; Bang-Christensen, Sara R.; Yang, Ming-Hsin; Clausen, Thomas M.; Pereira, Marina A.; Sharma, Shreya; Ditlev, Sisse B.; Nielsen, Morten A.; Choudhary, Swati; Gustavsson, Tobias; Sorensen, Poul H.; Meyer, Tim; Propper, David; Shamash, Jonathan; Theander, Thor G.; Aicher, Alexandra; Daugaard, Mads; Heeschen, Christopher; Salanti, Ali (December 2018). "The VAR2CSA malaria protein efficiently retrieves circulating tumor cells in an EpCAM-independent manner". Nature Communications. 9 (1): 3279. Bibcode:2018NatCo...9.3279A. doi:10.1038/s41467-018-05793-2. PMC   6095877 . PMID   30115931.
  8. ↑ Thiele, Jana- A.; Pitule, Pavel; Hicks, James; Kuhn, Peter (2019). "Single-Cell Analysis of Circulating Tumor Cells". Tumor Profiling. Methods in Molecular Biology. Vol. 1908. pp. 243–264. doi:10.1007/978-1-4939-9004-7_17. ISBN   978-1-4939-9002-3. PMC   7679177 . PMID   30649733.
  9. ↑ Nakazawa, M.; Lu, C.; Chen, Y.; Paller, C. J.; Carducci, M. A.; Eisenberger, M. A.; Luo, J.; Antonarakis, E. S. (2015-09-01). "Serial blood-based analysis of AR-V7 in men with advanced prostate cancer". Annals of Oncology. 26 (9): 1859–1865. doi:10.1093/annonc/mdv282. ISSN   0923-7534. PMC   4551160 .
  10. ↑ Heitzer, E.; Ulz, P.; Geigl, J. B. (11 November 2014). "Circulating Tumor DNA as a Liquid Biopsy for Cancer". Clinical Chemistry. 61 (1): 112–123. doi: 10.1373/clinchem.2014.222679 . PMID   25388429.
  11. ↑ Wan, Jonathan C. M.; Massie, Charles; Garcia-Corbacho, Javier; Mouliere, Florent; Brenton, James D.; Caldas, Carlos; Pacey, Simon; Baird, Richard; Rosenfeld, Nitzan (24 February 2017). "Liquid biopsies come of age: towards implementation of circulating tumour DNA". Nature Reviews Cancer. 17 (4): 223–238. doi:10.1038/nrc.2017.7. PMID   28233803. S2CID   4561229.
  12. ↑ Avanzini S, Kurtz DM, Chabon JJ, Moding EJ, Hori SS, Gambhir SS, Alizadeh AA, Diehn M, Reiter JG (December 2020). "A mathematical model of ctDNA shedding predicts tumor detection size". Science Advances. 6 (50): eabc4308. Bibcode:2020SciA....6.4308A. doi: 10.1126/sciadv.abc4308 . PMC   7732186 . PMID   33310847. S2CID   228096858.
  13. ↑ Chaudhuri, Aadel A.; Pellini, Bruna; Pejovic, Nadja; Chauhan, Pradeep S.; Harris, Peter K.; Szymanski, Jeffrey J.; Smith, Zachary L.; Arora, Vivek K. (November 2020). "Emerging Roles of Urine-Based Tumor DNA Analysis in Bladder Cancer Management". JCO Precision Oncology. 4 (4): 806–817. doi:10.1200/PO.20.00060. PMC   7448529 . PMID   32923907.
  14. ↑ Bicocca, Vincent T.; Phillips, Kevin G.; Fischer, Daniel S.; Caruso, Vincent M.; Goudarzi, Mahdi; Garcia-Ransom, Monica; Lentz, Peter S.; MacBride, Andrew R.; Jensen, Brad W.; Mazzarella, Brian C.; Koppie, Theresa; Korkola, James E.; Gray, Joe W.; Levin, Trevor G. (September 2022). "Urinary Comprehensive Genomic Profiling Correlates Urothelial Carcinoma Mutations with Clinical Risk and Efficacy of Intervention". Journal of Clinical Medicine. 11 (19): 5827. doi: 10.3390/jcm11195827 . ISSN   2077-0383. PMC   9571552 . PMID   36233691.
  15. ↑ Ward, DG; Nyangoma, S; Joy, H; Hamilton, E; Wei, W; Tselepis, C; Steven, N; Wakelam, MJ; Johnson, PJ; Ismail, T; Martin, A (16 June 2008). "Proteomic profiling of urine for the detection of colon cancer". Proteome Science. 6: 19. doi: 10.1186/1477-5956-6-19 . PMC   2440369 . PMID   18558005.
  16. ↑ Arasaradnam, RP; Wicaksono, A; O'Brien, H; Kocher, HM; Covington, JA; Crnogorac-Jurcevic, T (February 2018). "Noninvasive Diagnosis of Pancreatic Cancer Through Detection of Volatile Organic Compounds in Urine". Gastroenterology. 154 (3): 485–487.e1. doi: 10.1053/j.gastro.2017.09.054 . PMID   29129714.
  17. ↑ Halling, Kevin C.; Kipp, Benjamin R. (September 2008). "Bladder Cancer Detection Using FISH (UroVysion Assay)". Advances in Anatomic Pathology. 15 (5): 279–286. doi:10.1097/PAP.0b013e3181832320. ISSN   1072-4109.
  18. ↑ Eskra, Jillian N.; Rabizadeh, Daniel; Mangold, Leslie; Fabian, Elizabeth; Brennen, W. Nathaniel; Yeater, David B.; Pienta, Kenneth J.; Partin, Alan W.; Isaacs, William B.; Pavlovich, Christian P.; Luo, Jun (2020-08-20). "A novel method for detection of exfoliated prostate cancer cells in urine by RNA in situ hybridization". Prostate Cancer and Prostatic Diseases. 24 (1): 220–232. doi:10.1038/s41391-020-00272-6. ISSN   1365-7852.
  19. ↑ Bethel, Kelly; Luttgen, Madelyn S; Damani, Samir; Kolatkar, Anand; Lamy, Rachelle; Sabouri-Ghomi, Mohsen; Topol, Sarah; Topol, Eric J; Kuhn, Peter (9 January 2014). "Fluid phase biopsy for detection and characterization of circulating endothelial cells in myocardial infarction". Physical Biology. 11 (1): 016002. Bibcode:2014PhBio..11a6002B. doi:10.1088/1478-3975/11/1/016002. PMC   4143170 . PMID   24406475.
  20. ↑ Pyykkö, Okko T.; Lumela, Miikka; Rummukainen, Jaana; Nerg, Ossi; Seppälä, Toni T.; Herukka, Sanna-Kaisa; Koivisto, Anne M.; Alafuzoff, Irina; Puli, Lakshman; Savolainen, Sakari; Soininen, Hilkka; Jääskeläinen, Juha E.; Hiltunen, Mikko; Zetterberg, Henrik; Leinonen, Ville; Fiandaca, Massimo S. (17 March 2014). "Cerebrospinal Fluid Biomarker and Brain Biopsy Findings in Idiopathic Normal Pressure Hydrocephalus". PLOS ONE. 9 (3): e91974. Bibcode:2014PLoSO...991974P. doi: 10.1371/journal.pone.0091974 . PMC   3956805 . PMID   24638077.
  21. ↑ Mouliere F, Mair R, Chandrananda D, Marass F, Smith CG, Su J, Morris J, Watts C, Brindle KM, Rosenfeld N (2018). "Detection of cell-free DNA fragmentation and copy number alterations in cerebrospinal fluid from glioma patients". EMBO Mol Med. 10 (12): e9323. doi:10.15252/emmm.201809323. PMC   6284385 . PMID   30401727.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  22. ↑ Rafi, Imran; Hill, Melissa; Hayward, Judith; Chitty, Lyn S (July 2017). "Non-invasive prenatal testing: use of cell-free fetal DNA in Down syndrome screening". British Journal of General Practice. 67 (660): 298–299. doi:10.3399/bjgp17X691625. PMC   5565870 . PMID   28663415.
  23. ↑ Singh, Ripudaman; Hatt, Lotte; Ravn, Katarina; Vogel, Ida; Petersen, Olav Bjørn; Uldbjerg, Niels; Schelde, Palle (September 2017). "Fetal cells in maternal blood for prenatal diagnosis: a love story rekindled". Biomarkers in Medicine. 11 (9): 705–710. doi: 10.2217/bmm-2017-0055 . PMID   28617034.
  24. ↑ Weiner, Carl P.; Lee, Gene T. (2017). "Cordocentesis". In Apuzzio, Joseph J.; Vintzileos, Anthony M.; Berghella, Vincenzo; Alvarez-Perez, Jesus R. (eds.). Operative Obstetrics, 4E. Routledge. doi:10.1201/9781315382739. ISBN   978-1-4987-2056-4.
  25. ↑ Perni, Sriram C.; Roost, John R.; Chervenak, Frank A. (2017). "Amniocentesis". In Apuzzio, Joseph J.; Vintzileos, Anthony M.; Berghella, Vincenzo; Alvarez-Perez, Jesus R. (eds.). Operative Obstetrics, 4E. Routledge. doi:10.1201/9781315382739. ISBN   978-1-4987-2056-4.
  26. ↑ Nascimento da Silva, Monica; Sicchieri, Letícia Bonfante; Rodrigues de Oliveira Silva, Flávia; Andrade, Maira Franco; Courrol, Lilia Coronato (2014). "Liquid biopsy of atherosclerosis using protoporphyrin IX as a biomarker". The Analyst. 139 (6): 1383–8. Bibcode:2014Ana...139.1383N. doi:10.1039/c3an01945d. PMID   24432352. S2CID   25707729.
  27. ↑ "What is circulating tumor DNA and how is it used to diagnose and manage cancer?: MedlinePlus Genetics". medlineplus.gov. Retrieved 2021-09-03.
  28. ↑ "What is circulating tumor DNA and how is it used to diagnose and manage cancer? ". National Institutes of Health Genetics Home Reference. 5 March 2019. Retrieved 12 March 2019.
  29. ↑ "Liquid Biopsies Show High Correlation with Tissue Biopsy for Genetic Mutations" Archived 2022-10-17 at the Wayback Machine . Oncology Practice Management. July 2016. Retrieved 12 March 2019.
  30. ↑ "Cell-free DNA as a biomarker in cancer". Extracell Vesicles Circ Nucleic Acid. Aug 2022. Retrieved 04 Aug 2022.
  31. ↑ Picher, Andy."Liquid Biopsy, Key for Precision Medicine". Genetic Engineering & Biotechnology News. 23 July 2018. Retrieved 12 March 2019.
  32. ↑ "Liquid Biopsy: Differences Among Technologies" Archived 2017-11-15 at the Wayback Machine . OncLive. 17 September 2017. Retrieved 12 March 2019.
  33. ↑ Ellis, Jen."dPCR: The Emergence of the Digital Age". Biocompare. 7 May 2018. Retrieved 12 March 2019.
  34. ↑ van der Pol Y, Mouliere F (2019). "Toward the early detection of cancer by decoding the epigenetic and environmental fingerprints of cell-free DNA". Cancer Cell. 36 (4): 350–368. doi: 10.1016/j.ccell.2019.09.003 . PMID   31614115.
  35. ↑ McDowell, Sandy."Liquid Biopsies: Past, Present, and Future". American Cancer Society. 12 February 2018. Retrieved 12 March 2019.
  36. ↑ "Liquid Biopsy: Using DNA in Blood to Detect, Track, and Treat Cancer". National Cancer Institute. 8 November 2017. Retrieved 12 March 2019.
  37. ↑ Olsson, Eleonor; Winter, Christof (2015). "Serial monitoring of circulating tumor DNA in patients with primary breast cancer for detection of occult metastatic disease". EMBO Molecular Medicine. 7 (8): 1034–1047. doi:10.15252/emmm.201404913. PMC   4551342 . PMID   25987569.
  38. ↑ "Liquid Biopsy Market - A Global and Regional Analysis: Focus on Offering, Usage, Workflow, Circulating Biomarker, Sample, Technology, Clinical Application, End User, and Region - Analysis and Forecast, 2022-2032". bisresearch.com. Retrieved 2022-09-19.
  39. ↑ Brito-Rocha, Tiago; Constâncio, Vera; Henrique, Rui; Jerónimo, Carmen (18 March 2023). "Shifting the Cancer Screening Paradigm: The Rising Potential of Blood-Based Multi-Cancer Early Detection Tests". Cells. 12 (6): 935. doi: 10.3390/cells12060935 . ISSN   2073-4409. PMC   10047029 . PMID   36980276.
  40. ↑ Kwapisz, Dorota (February 2017). "The first liquid biopsy test approved. Is it a new era of mutation testing for non-small cell lung cancer?". Annals of Translational Medicine. 5 (3): 46. doi: 10.21037/atm.2017.01.32 . ISSN   2305-5839. PMC   5326656 . PMID   28251125.
  41. ↑ Karachaliou, N; Mayo-de-Las-Casas, C; Molina-Vila, MA; Rosell, R (March 2015). "Real-time liquid biopsies become a reality in cancer treatment". Annals of Translational Medicine. 3 (3): 36. doi:10.3978/j.issn.2305-5839.2015.01.16. PMC   4356857 . PMID   25815297.
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