PMID- 34710798 OWN - NLM STAT- MEDLINE DCOM- 20211224 LR - 20211224 IS - 2210-7762 (Print) VI - 258-259 DP - 2021 Nov TI - The oncogenic roles of NTRK fusions and methods of molecular diagnosis. PG - 110-119 LID - S2210-7762(21)00216-7 [pii] LID - 10.1016/j.cancergen.2021.10.005 [doi] AB - The NTRK gene family is composed of NTRK1, NTRK2, and NTRK3, which encode three tropomyosin-receptor kinases, belonging to a class of tyrosine kinase receptors. These proteins are known to play roles in cell proliferation, differentiation, apoptosis, and survival. Fusions involving the NTRK genes are long known as drivers in many tumors. Although they occur in less than 5% of all malignancies, their occurrence in a great diversity of tumors has been documented. Several rare tumors including infantile fibrosarcoma, secretory breast carcinoma, and mammary analogue secretory carcinoma are accompanied by NTRK fusions in more than 90% of cases, demonstrating a diagnostic value for the NTRK fusion testing in these tumors. More recently, the development of effective targeted therapies has created a demand for their detection in all malignancies. A variety of approaches are available for testing including immunohistochemistry, fluorescence in situ hybridization (FISH), reverse transcription polymerase chain reaction (RT-PCR), and DNA- and RNA-based next-generation sequencing (NGS). This article reviews the molecular biology and tumorigenesis of NTRK fusions, their prevalence and clinical significance with a focus on available methods for fusion detection. The advantages and limitations of different technologies, the best practice algorithms for NTRK fusion detection, and the future direction of NTRK testing are also discussed. CI - Copyright (c) 2021. Published by Elsevier Inc. FAU - Aref-Eshghi, Erfan AU - Aref-Eshghi E AD - Department of Pathology and Laboratory Medicine, Division of Genomic Diagnostics, Children's Hospital of Philadelphia, Philadelphia, PA, United States. FAU - Lin, Fumin AU - Lin F AD - Department of Pathology and Laboratory Medicine, Division of Genomic Diagnostics, Children's Hospital of Philadelphia, Philadelphia, PA, United States. FAU - Li, Marilyn M AU - Li MM AD - Department of Pathology and Laboratory Medicine, Division of Genomic Diagnostics, Children's Hospital of Philadelphia, Philadelphia, PA, United States; Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States; Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, PA, United States. FAU - Zhong, Yiming AU - Zhong Y AD - Department of Pathology and Laboratory Medicine, Division of Genomic Diagnostics, Children's Hospital of Philadelphia, Philadelphia, PA, United States; Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States. Electronic address: zhongy1@chop.edu. LA - eng PT - Journal Article PT - Review DEP - 20211018 PL - United States TA - Cancer Genet JT - Cancer genetics JID - 101539150 RN - 0 (Biomarkers, Tumor) RN - 0 (Oncogene Proteins, Fusion) RN - EC 2.7.10.1 (Receptor, trkA) RN - EC 2.7.10.1 (Receptor, trkB) RN - EC 2.7.10.1 (Receptor, trkC) SB - IM MH - Animals MH - Biomarkers, Tumor/*genetics MH - Humans MH - Neoplasms/*diagnosis/genetics MH - Oncogene Proteins, Fusion/*genetics MH - Prognosis MH - Receptor, trkA/*genetics MH - Receptor, trkB/*genetics MH - Receptor, trkC/*genetics OTO - NOTNLM OT - Carcinogenesis OT - FISH OT - Immunohistochemistry OT - NGS OT - NTRK COIS- Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. EDAT- 2021/10/29 06:00 MHDA- 2021/12/25 06:00 CRDT- 2021/10/28 20:28 PHST- 2021/07/02 00:00 [received] PHST- 2021/09/23 00:00 [revised] PHST- 2021/10/16 00:00 [accepted] PHST- 2021/10/29 06:00 [pubmed] PHST- 2021/12/25 06:00 [medline] PHST- 2021/10/28 20:28 [entrez] AID - S2210-7762(21)00216-7 [pii] AID - 10.1016/j.cancergen.2021.10.005 [doi] PST - ppublish SO - Cancer Genet. 2021 Nov;258-259:110-119. doi: 10.1016/j.cancergen.2021.10.005. Epub 2021 Oct 18.