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Department of Medical Oncology, Charing Cross Hospital, Fulham Palace Rd., London, W6 8RF [J. J. G., J. S., G. K. R., R. B., R. C. C.], and Department of Histopathology, The Women's Hospital, Catherine's St., Liverpool, L8 7NJ [L. T.], England
The presence and distribution of basic fibroblast growth factor (bFGF) and transforming growth factor ß1 in benign and malignant human breast tissue were determined by immunohistochemistry and immunoblotting.
Peroxidase staining of biopsy specimens using a polyclonal antibody to amino acids 1–24 of bFGF and a monoclonal antibody to whole recombinant bFGF showed this growth factor to be localized in the myoepithelial cells of the benign breast. Epithelial cells and stroma were negative. In hyperplasia and intraductal carcinoma in situ staining was still seen around the perimeter of enlarged ducts. In malignant biopsies, however, staining was seen only when benign elements were present or residual myoepithelial cells and basement membrane remained. Antigen absorption and immunoblotting confirmed the antibody staining to be specific for bFGF.
Transforming growth factor ß1 was shown, using the same techniques, to be located in the periductal and intraductal stroma, closely associated with epithelial or myoepithelial cells in the benign and malignant breast.
The relative localization of these two growth factors in the mammary gland may be significant in the control of breast development and/or tumor formation and progression.
1 Supported by a Breast Cancer Research Trust Grant and a Cancer Research Campaign Grant.
2 To whom requests for reprints should be addressed.
Received 7/ 2/90. Accepted 6/25/91.
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