Is work burden associated with postmenopausal breast cancer? A population-based 25-year follow-up.

Objective: To study the association between breast cancer and work burden over 25 years.

Methods: The study was based on the Kuopio Osteoporosis Risk Factor and Prevention (OSTPRE) cohort (n = 14,220) and included women who had answered the questionnaire from the year 1994 and had no previous breast cancer. Breast cancer cases were recorded from the Finnish Cancer Registry during the study period: from 1st June 1994 till December 31, 2019.