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Cancer Causes & Control

, Volume 16, Issue 8, pp 965–973 | Cite as

Hormone Replacement Therapy, Reproductive History, and Colorectal Adenomas: Data from the Prostate, Lung, Colorectal and Ovarian (PLCO) Cancer Screening Trial (United States)

  • Mark P. PurdueEmail author
  • Pamela J. Mink
  • Patricia Hartge
  • Wen-Yi Huang
  • Saundra Buys
  • Richard B. Hayes
Article

Abstract

Objective

Findings from some epidemiologic studies of colorectal cancer and adenoma suggest that the protective effect of post-menopausal hormone replacement therapy (HRT) may differ across categories of age and body mass index (BMI). We conducted an analysis of women participating in the Prostate, Lung, Colorectal, and Ovarian (PLCO) Cancer Screening Trial to investigate the relationship between HRT use and prevalent adenoma, both overall and across different population subgroups.

Methods

Women aged 55–74 were randomized to screening by flexible sigmoidoscopy at ten PLCO screening centers between September 1993 and September 2001. We identified 1468 women with at least one left-sided adenoma and 19,203 without adenoma or colorectal cancer. Information about HRT and reproductive factors was obtained from a self-administered questionnaire.

Results

Compared to never use of HRT, current use was associated with a decreased prevalence of left-sided adenoma (odds ratio (OR) 0.85; 95% confidence interval (CI) 0.75–0.97). We found no evidence of dose–response with increasing duration of use for current or former users. The association with current HRT use was stronger among women aged 65+ (OR 0.69; 95% CI 0.56–0.84), with a BMI<30 (OR 0.82; 95% CI 0.71–0.95) and who regularly use aspirin or ibuprofen (OR 0.77; 95% CI 0.65–0.91). Other reproductive factors were not significantly associated with adenoma prevalence.

Conclusions

Our findings suggest that current HRT use may protect against colorectal adenoma, and that this protective effect is short-lived following cessation of use.

Key words

adenoma colorectal neoplasms hormone replacement therapy mass screening 

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Copyright information

© Springer 2005

Authors and Affiliations

  • Mark P. Purdue
    • 1
    Email author
  • Pamela J. Mink
    • 1
    • 2
  • Patricia Hartge
    • 1
  • Wen-Yi Huang
    • 1
  • Saundra Buys
    • 3
  • Richard B. Hayes
    • 1
  1. 1.Occupational and Environmental Epidemiology Branch, Division of Cancer Epidemiology and GeneticsNational Cancer InstituteRockvilleUSA
  2. 2.Division of Cancer PreventionNational Cancer InstituteRockvilleUSA
  3. 3.University of Utah Health Sciences CenterSalt Lake CityUSA

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