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Cancer Causes Control. 2012 Jan 28; doi: 10.1007/s10552-012-9897-x. Epub 2012 Jan 28.

Body size and the risk of postmenopausal breast cancer subtypes in the California Teachers Study cohort.

Cancer causes & control : CCC

Alison J Canchola, Hoda Anton-Culver, Leslie Bernstein, Christina A Clarke, Katherine Henderson, Huiyan Ma, Giske Ursin, Pamela L Horn-Ross

Affiliations

  1. Cancer Prevention Institute of California, 2201 Walnut Avenue, Suite 300, Fremont, CA, 94538, USA, [email protected].

PMID: 22286371 PMCID: PMC3366039 DOI: 10.1007/s10552-012-9897-x

Abstract

PURPOSE: To evaluate how the association between body size and breast cancer risk varies by tumor receptor subtype, host factors, and other exposures among women in the California Teachers Study cohort. METHODS: Among 52,642 postmenopausal women, 2,321 developed invasive breast cancer with known estrogen- and progesterone-receptor status (1,652 ER+PR+, 338 ER+PR-, and 312 ER-PR-) between 1995 and 2007. In a subset of 35,529 with waist circumference data, 1,377 developed invasive breast cancer with known ERPR status (991 ER+PR+, 208 ER+PR-, 169 ER-PR-) between 1997 and 2007. Multivariate Cox regression was performed to estimate relative risks (RR) and 95% confidence intervals (CI). RESULTS: Obesity, adult weight gain of ≥40 pounds, greater abdominal adiposity, and greater height increased the risk of ER+PR+ breast cancer. The increased risk associated with postmenopausal obesity was limited to those who did not use hormone therapy (HT) at cohort entry (RR = 1.37; 95% CI, 1.05-1.78 for BMI ≥ 30 vs. < 25 kg/m(2); p-interaction = 0.14) and those who were not overweight or obese at age 18 (p-interaction = 0.06). The increased risk associated with greater abdominal adiposity was limited to those who were not also overweight or obese (p-interaction = 0.01). Neither obesity, abdominal adiposity, nor height was associated with the risk of ER-PR- tumors. CONCLUSIONS: The effects of body size on postmenopausal breast cancer risk differed by hormone receptor subtype, and among women with ER+PR+ tumors, by HT use and early adult body size.

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