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    Oral contraceptive (OCP) use increases proliferation and decreases oestrogen receptor content of epithelial cells in the normal human breast.

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    Authors
    Williams, Gerard
    Anderson, Elizabeth
    Howell, Anthony
    Watson, R
    Coyne, J
    Roberts, Stephen A
    Potten, Christopher S
    Affiliation
    Department of Clinical Research, Christie Hospital, Manchester, UK.
    Issue Date
    1991-05-10
    
    Metadata
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    Abstract
    The effect of ingestion of oral contraceptives (OCP) on cell proliferation and oestrogen (ER) and progesterone receptor (PR) expression of the epithelial cells of the normal human breast was compared with findings in controls not taking OCPs. Histologically normal breast tissue was removed during operation for fibroadenoma or reduction mammoplasty in 216 women whose mean age was 28.1 +/- 8.5 years (+/- SD range 14-53 years). During natural cycles the mean proportion of cells expressing ER was 3.94 +/- 3.71 (% mean +/- SD, range 0-20.8, n = 51), while of those expressing PR it was 12.1 +/- 7.1% (range 3.0-36.1, n = 47). There was a significant decline in ER during the menstrual cycle [p = 0.001 by multiple linear regression (MLR)], but there was no significant change in the proportion which expressed PR. The mean proportion of proliferating cells (LI) was 2.50 +/- 2.42 (range 0-11.5, n = 147). There was a significant increase of LI during the cycle (p = less than 0.001, MLR) and a significant inverse relationship between LI and ER (r = -0.29, p less than 0.01). Use of the OCP significantly reduced the number of cells which expressed ER and increased the LI earlier in the cycle. No effect of OCP use on the number of PR+ cells was detectable. We conclude that significant changes in the proportions of ER+ and proliferating cells occur during natural menstrual cycles. These changes are perturbed by ingestion of OCPs, so that there is greater suppression of ER and a longer period of high proliferation during the menstrual cycle. These results may explain the relationship between OCP use and the possible risk of breast cancer.
    Citation
    Oral contraceptive (OCP) use increases proliferation and decreases oestrogen receptor content of epithelial cells in the normal human breast. 1991, 48 (2):206-10 Int. J. Cancer
    Journal
    International Journal of Cancer.
    URI
    http://hdl.handle.net/10541/108458
    DOI
    10.1002/ijc.2910480209
    PubMed ID
    2019467
    Type
    Article
    Language
    en
    ISSN
    0020-7136
    ae974a485f413a2113503eed53cd6c53
    10.1002/ijc.2910480209
    Scopus Count
    Collections
    All Christie Publications
    All Paterson Institute for Cancer Research

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