© 1993 by Oxford University Press
Journal of the National Cancer Institute, Vol. 85, No. 5, 398-402,
March 3, 1993
© 1993 Oxford University Press
Prognostic Significance of the 67-Kilodalton Laminin Receptor Expression in Human Breast Carcinomas
Division of Experimental Oncology E, Instituto Nationale Tumori Milan, Italy
Division of Surgical Oncology B, Istituto Nazionale Tumori Milan, Italy
Division of Anatomical Pathology and Cytology, Istituto Nazionale Tumori Milan, Italy
Correspondence to: Maria I.Colnaghi, Ph.D., lstituto Nazionale Tumori, Via G. Venezian I, 20133 Milan, Italy.
Background: The 67-kd laminin receptor is a cell-surface protein that binds laminin with high affinity. In vitro studies suggest that this protein is involved in the progression of human tumors to invasive cancers (metastasis), but there have been few in vivo studies. Identification of such proteins would allow development of therapies aimed at interfering with their mechanisms of action. Purpose: This large retrospective study was designed to investigate the association of expression of this laminin receptor molecule with established prognostic factors and overall survival in breast carcinoma patients. Methods: We immunohistochemically stained archival paraffin-embedded sections of 1160 primary breast carcinomas, using an immunoperoxidase technique and the MLuC5 monoclonal antibody, which is specific for the 67-kd laminin receptor. Specimens were obtained from consecutive surgeries performed from January 1968 through December 1971. Patients with negative lymph nodes or involved regional nodes had been treated with surgery alone; those with positive axillary nodes had received surgery and radiotherapy. No chemotherapy had been administered until disease recurrence. The statistical analysis was carried out using the logrank method for the survival curves and the actuarial life table to calculate survival rates according to the different prognostic variables. Results: We found statistically significant associations between laminin receptor expression and young age (P<.001), premenopausal status (P =.001), positive axillary lymph nodes (P =.01), peritumoral lymphatic invasion (P =.02), and the diameter of the tumor (P =.05). Moreover, the association of expression of the receptor protein with poor prognosis, as indicated by survival curves, was statistically significant (P<.01). For patients with receptor-negative tumors, the survival rate was 50% at 20 years; for those with receptor-positive tumors, the survival rate was 50% at 13 years. Multivariate analysis showed the laminin receptor to be an independent prognostic factor (P =.005), indicating its predictive value in relation to overall survival. Conclusions: Our data suggest that the 67-kd laminin receptor is associated with the metastatic process. Implications: These preliminary findings also suggest that hormones may have a regulatory role in the in vivo expression of the 67-kd laminin receptor, which supports the hypothesis that hormone therapy might inhibit expression of the receptor. Studies of expression of this receptor in tumors of patients with extremely different sex hormone levels (e.g., men and pregnant women) are in progress. [J Natl Cancer Inst 85: 398-402, 1993]
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