hTERT Expression in Human Breast Cancer and Non-Cancerous Breast Tissue: Correlation with Tumour Stage and c-Myc Expression

Kirkpatrick, K.L.; Ogunkolade, W.; Elkak, A.E.; Bustin, S.; Jenkins, P.; Ghilchick, M.; Newbold, R.F.; Mokbel, K.

doi:10.1023/a:1021849217054

Cited by 53Telomeres, Telomerase, and SenescenceBreast Cancer Treatment StudiesBreast Lesions and Carcinomas

hTERT Expression in Human Breast Cancer and Non-Cancerous Breast Tissue: Correlation with Tumour Stage and c-Myc Expression

Kirkpatrick, K.L., Ogunkolade, W., Elkak, A.E., Bustin, S., Jenkins, P., Ghilchick, M., Newbold, R.F., Mokbel, K.·2003·Breast Cancer Research and Treatment

DOI 10.1023/a:1021849217054

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Abstract

Telomerase is a ribonucleoprotein enzyme that synthesises telomeres after cell division and maintains chromosomal length and stability thus leading to cellular immortalisation. hTERT (human telomerase reverse transcriptase) gene is the rate-limiting determinant of telomerase reactivation. The present study aims to quantitatively measure the expression of hTERT mRNA in human breast cancer, adjacent non-cancerous tissue (ANCT) and benign breast lesions, examine the association between hTERT and the clinicopathological characteristics of the cancer specimens and to explore the relationship between c-Myc and hTERT expressions. RNA was extracted from 49 breast carcinomas, 46 matched ANCT, and eight fibroadenomas. hTERT and c-Myc mRNA expressions were estimated by reverse transcriptase-PCR (RT-PCR) and Taqman methodology. hTERT mRNA was present in all of the cancerous and most of ANCT specimens with levels being much higher in the cancerous tissue than in ANCT. The ratio of hTERT mRNA in tumour to that in ANCT was 2011 (95% confidence interval 373-10,853, P < 0.0001). There was no significant association between tumour hTERT expression and patient's age, tumour size, grade, nodal metastasis, estrogen receptor (ER) positivity, lymphovascular (LVI) or c-Myc expression. However, there was a weak but significant negative correlation between hTERT expression and progesterone receptor (PR) status (p = 0.04) in tumours. hTERT mRNA expression was also significantly higher in carcinomas (median = 2.61 x 10(6)) than in fibroadenomas (median = 424).We conclude that hTERT mRNA expression is significantly higher in human breast cancer than in non-cancerous breast tissue suggesting that hTERT has a potential role in breast cancer diagnosis. The hTERT mRNA levels in tumour do not seem to be associated with the patient's age or advanced tumour stage. Furthermore, hTERT mRNA expression does not correlate with c-Myc mRNA expression in breast cancer.

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Myc and hTERT expression levels are not necessarily tightly correlated in some cancer cells.
“However, several studies found that Myc and hTERT expression levels are not necessarily tightly correlated in some cancer cells.(20,21)”
From Understanding and exploiting <i>hTERT</i> promoter regulation for diagnosis and treatment of human cancers (2008) · cites this paper as [20]

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Authors: Kirkpatrick, K. L., Ogunkolade, W., Elkak, A. E., Bustin, S., Jenkins, P., Ghilchick, M., Newbold, R. F., & Mokbel, K.
Affiliations: St George's Hospital (GB)
Royal London Hospital (GB)
Brunel University of London (GB)
ORCID: Bustin, S.
Jenkins, P.
Mokbel, K.
Venue: Breast Cancer Research and Treatment
Publisher: Springer Science and Business Media LLC
Published: 2003-02
Volume: 77
Issue: 3
Pages: 277-284
ISSN: 0167-6806 (ISSN-L)
1573-7217
DOI: 10.1023/a:1021849217054
OpenAlex: W2074108393
Cited by: 53
References: 37
Citations by year: 2025: 1 · 2024: 3 · 2023: 2 · 2021: 1 · 2020: 3 · 2019: 1 · 2018: 1 · 2017: 4 · 2015: 1 · 2014: 2 · 2013: 1 · 2012: 5
FWCI: 1.72
Type: journal article
Language: en
Open access: closed
Licence: www.springernature.com/gp/researchers/text-and-data-mining (tdm)
www.springernature.com/gp/researchers/text-and-data-mining (vor)
Locations: Breast Cancer Research and Treatment (publishedVersion)
PubMed (publishedVersion)
Topics: Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Breast Cancer Treatment Studies
Health Sciences › Medicine › Pathology and Forensic Medicine › Breast Lesions and Carcinomas
Keywords: hTERT, telomerase reverse transcriptase, breast cancer, telomerase reactivation, c-Myc, fibroadenoma, tumor stage, progesterone receptor, tumour biomarkers, breast cancer diagnosis
MeSH terms: Breast, Breast Neoplasms, Cell Transformation, Neoplastic, DNA-Binding Proteins, Female, Humans, Neoplasm Staging, RNA, Messenger, Gene Expression Regulation, Neoplastic, Genes, myc, DNA Primers, Telomerase, Reverse Transcriptase Polymerase Chain Reaction

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hTERT Expression in Human Breast Cancer and Non-Cancerous Breast Tissue: Correlation with Tumour Stage and c-Myc Expression

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