Cancer Causes & Control

, Volume 21, Issue 12, pp 2241–2248

Body size and the risk of ovarian cancer by hormone therapy use in the California Teachers Study cohort

  • Alison J. Canchola
  • Ellen T. Chang
  • Leslie Bernstein
  • Joan A. Largent
  • Peggy Reynolds
  • Dennis Deapen
  • Katherine D. Henderson
  • Giske Ursin
  • Pamela L. Horn-Ross
Original paper

DOI: 10.1007/s10552-010-9647-x

Cite this article as:
Canchola, A.J., Chang, E.T., Bernstein, L. et al. Cancer Causes Control (2010) 21: 2241. doi:10.1007/s10552-010-9647-x

Abstract

Objective

To investigate whether obesity and hormone therapy (HT) are associated with ovarian cancer risk among women in the California Teachers Study cohort.

Methods

Of 56,091 women age ≥45 years, 277 developed epithelial ovarian cancer between 1995 and 2007. Multivariate Cox regression was performed.

Results

Among women who never used HT, greater adult weight gain, waist circumference and waist-to-height ratio, but not adult BMI, increased risk of ovarian cancer. Compared to women who never used HT and had a stable adult weight, risk of ovarian cancer was increased in women who gained ≥40 lb (relative risk (RR) 1.8, 95% confidence interval (CI): 1.0–3.0) or used HT for >5 years (RR 2.3 95% CI: 1.3–4.1). Having both exposures (RR 1.9, 95% CI: 0.99–3.5), however, did not increase risk more than having either alone. Results were similar for waist circumference and weight-to-height ratio; however, differences across HT groups were not statistically significant.

Conclusions

This study suggests that abdominal adiposity and weight gain, but not overall obesity, increase ovarian cancer risk and that there may be a threshold level beyond which additional hormones, whether exogenous or endogenous, do not result in additional elevation in risk. However, large pooled analyses are needed to confirm these findings.

Keywords

Ovarian cancerObesityAbdominal adiposityHormone therapy

Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Alison J. Canchola
    • 1
  • Ellen T. Chang
    • 1
    • 2
  • Leslie Bernstein
    • 3
  • Joan A. Largent
    • 4
  • Peggy Reynolds
    • 1
    • 2
  • Dennis Deapen
    • 5
  • Katherine D. Henderson
    • 3
  • Giske Ursin
    • 5
    • 6
  • Pamela L. Horn-Ross
    • 1
    • 2
  1. 1.Cancer Prevention Institute of CaliforniaFremontUSA
  2. 2.Division of Epidemiology, Department of Health Research and PolicyStanford University School of MedicineStanfordUSA
  3. 3.Division of Cancer Etiology, Department of Population SciencesCity of Hope National Medical CenterDuarteUSA
  4. 4.Department of Epidemiology, College of Health SciencesUniversity of California IrvineIrvineUSA
  5. 5.Department of Preventive MedicineUniversity of Southern California Keck School of MedicineLos AngelesUSA
  6. 6.Department of NutritionUniversity of OsloOsloNorway