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    Effect of tamoxifen upon cell DNA analysis by flow cytometry in primary carcinoma of the breast.

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    Authors
    Baildam, Andrew D
    Zaloudik, J
    Howell, Anthony
    Barnes, Diana M
    Moore, Michael
    Sellwood, R A
    Issue Date
    1987-05
    
    Metadata
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    Abstract
    The effect of tamoxifen upon cellular DNA ploidy in carcinoma of the breast was assessed by flow cytometry (FCM), in a prospective group of 77 patients with primary operable disease. Each had a needle biopsy at the outpatient visit for diagnosis and FCM analysis, and definitive surgery was performed a median of 8 days later. Forty received tamoxifen during this period - 40 mg qds loading dose for 24 h, followed by 20 mg daily until the day of operation: 37 patients received no therapy. The DNA histogram from the needle biopsy was compared with that obtained from the resected tumour for each individual. There was little change between the pair of histograms from tumours from the untreated patients. In those who had received tamoxifen the most consistent effect was a marked reduction in the magnitude of the 'tetraploid' peak in tetraploid or near-tetraploid tumours with DNA indices 1.8-2.0. There was little change in diploid or 'other DNA-aneuploid' tumours. In tetraploid tumours (DNA index of 2.0) the percentage of nuclei in the diploid S phase was significantly related to the percentage of nuclei in the diploid G2 + M/tetraploid G1 peak (P less than 0.003, unpaired t test). These data suggest that an effect of tamoxifen can be demonstrated by FCM upon tumours exhibiting a tetraploid or near-tetraploid DNA content. It is possible that tetraploid or near-tetraploid human mammary tumours may be a distinct group of endocrine responsive tumours within the overall group of aneuploid tumours, and that the majority are probably derived from the diploid population rather than being a true aneuploid population.
    Citation
    Effect of tamoxifen upon cell DNA analysis by flow cytometry in primary carcinoma of the breast. 1987, 55 (5):561-6 Br. J. Cancer
    Journal
    British Journal of Cancer
    URI
    http://hdl.handle.net/10541/113549
    PubMed ID
    3606948
    Type
    Article
    Language
    en
    ISSN
    0007-0920
    Collections
    All Christie Publications
    All Paterson Institute for Cancer Research

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