© 1996 by Oxford University Press
Journal of the National Cancer Institute, Vol. 88, No. 2, 116-122,
January 17, 1996
© 1996 Oxford University Press
Telomerase Activity in Human Breast Tumors
1Department of Cell Biology and Neurosciences, The University of Texas Southwestern Medical Center at Dallas, and Department of General Medicine, Hiroshima University School of Medicine, Japan
2Department of Cell Biology and Neurosciences. The University of Texas Southwestern Medical Center Dallas
3Second Department of Surgery Dallas
4Department of Surgical Oncology, Research Institute for Radiation Biology and Medicine Dallas
5Department of General Medicine, Hiroshima University School of Medicine Dallas
6Simmons Cancer Center and Department of Pathology, The University of Texas Southwestern Medical Center Dallas
Jerry W. Shay, Ph.D., Department of Cell Biology and Neurosciences, The Univeristy of Texas Southwestern Medical Center at Dallas, 5323 Harry Hines Blvd., Dallas. TX 75235-9039.
BACKGROUND:: The activity of the ribonucleoprotein enzyme telomerase is not detected in normal somatic cells; thus, with each cell division, the ends of chromosomes consisting of the telomeric repeats TTAGGG progressively erode. The current model gaining support is that telomerase activity in germline and immortal cells maintains telomere length and thus compensates for the "end-replication problem."
PURPOSE:: Our objective was to determine when telomerase activity is reactivated in the progression to malignant breast cancer and if knowledge of telomerase activity may be an indicator for the diagnosis and potential treatment of breast cancer.
METHODS:: Using a polymerase chain reaction-based telomerase activity assay, we examined telomerase activity in 140 breast cancer specimens (from 140 patients), four phyllodes tumors (from four patients), 38 noncancerous lesions (20 fibroadenomas, 17 fibrocystic diseases, one gynecomastia; from 38 patients), and 55 adjacent noncancerous mammary tissues (from 55 of the 140 breast cancer patients). In addition, 33 fine-needle-aspirated breast samples (from 33 patients) were analyzed.
RESULTS:: Among surgically resected samples, telomerase activity was detected in 130 (93%) of 140 breast cancers. Telomerase activity was detected in 68% of stage I primary breast cancers, in 73% of cancers smaller than 20 mm, and in 81% of axillary lymph node-negative cancers. Moreover, the activity was detected in more than 95% of advanced stage tumors but in only two (4%) of 55 adjacent noncancerous tissues. While telomerase activity was not detected in any of 17 specimens of fibrocystic disease, surprisingly low levels of telomerase activity were detected in nine (45%) of 20 fibroadenomas. Among samples obtained by fine-needle aspiration, 14 (100%) of 14 patients whose fine-needle-aspirated specimen contained telomerase activity and who subsequently underwent surgery were confirmed to have breast cancer. Multivariate analysis of 125 specimens from patients for whom data were available on age at surgery, stage of disease, tumor size, lymph node status tumor histology, and menopausal status indicated that stage classification exhibited the strongest association with telomerase activity (for stage I versus stages II–IV: odds ratio = 1.0 versus 73.4; 95% confidence interval = 2.0–959.0; P =.02).
CONCLUSION:: Telomerase activity was detected in more than 95% of advanced stage breast cancers. It was absent in 19%–32% of less advanced cancers. Since a determination of any association between telomerase activity and patient survival is not possible at the present time, it remains to be determined whether lack of telomerase activity predicts for favorable outcome. [J Natl Cancer Inst 1996; 88: 116–22]
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