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08.09.2016 | Original paper | Ausgabe 10/2016

Cancer Causes & Control 10/2016

Sedentary time and breast cancer incidence in African American women

Zeitschrift:
Cancer Causes & Control > Ausgabe 10/2016
Autoren:
Sarah J. O. Nomura, Chiranjeev Dash, Lynn Rosenberg, Julie Palmer, Lucile L. Adams-Campbell
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1007/​s10552-016-0803-9) contains supplementary material, which is available to authorized users.

Abstract

Purpose

The objective of this study was to evaluate whether time spent sitting at work or watching television was associated with breast cancer risk among African American women.

Methods

The Black Women’s Health Study (analytic cohort = 46,734) is an ongoing prospective cohort study of African American women ages 21–69 at baseline (1995). Questionnaire data were used to estimate sedentary time. Total time spent sitting at work and watching television (individually and combined) at baseline and updated through follow-up (1995–2001) and breast cancer incidence (n = 2,041 incident cases, 1995–2013) was evaluated using proportional hazards regression.

Results

Higher total time spent sitting at baseline (≥10 vs. <5 h/day, HR 1.27, 95 % CI 1.06, 1.53) and updated through follow-up (≥10 vs. <5 h/day, HR 1.38, 95 % CI 1.14, 1.66) was associated with an increased breast cancer risk. Associations were stronger for hormone receptor-negative tumors (≥10 vs. <5 h/day, HR 1.70, 95 % CI 1.12, 2.55) compared to hormone receptor-positive tumors (≥10 vs. <5 h/day, HR 1.16, 95 % CI 0.88, 1.52), but tests for heterogeneity were not statistically significant (p heterogeneity = 0.31). Positive associations between total time spent sitting and breast cancer incidence did not differ by physical activity level or body composition measurements.

Conclusions

Our findings suggest that high sedentary time may increase risk for breast cancer among African American women.

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