Abstract
The activity of gamma-glutamyltranspeptidase (gamma GT) (EC 2.3.2.2) was examined by histoenzymatic labelling on frozen sections derived from normal breast tissue, benign lesions and carcinomas. In biopsies from normal tissue and benign lesions, labelling was very intense in lumina and in the apical pole of the cells lining the lumina whilst in the cytoplasm it was slightly positive. In 34 out of 70 carcinomas, gamma GT activity was either undetectable or slightly positive while in the remaining 36 there was intense activity. Statistical examination of the results revealed no obvious correlation of gamma GT activity with histological grade of the tumour, progesterone receptor content or classification of patients by pre- or postmenopausal status. A good correlation between gamma GT activity and the following unfavourable prognostic signs: lymph node metastases and absence of oestradiol receptors. Patients with gamma GT-negative tumours may have a more favourable prognosis than those with gamma GT-positive tumours.
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