Abstract：
:Breast cancer is the most common cancer in women. However, it remains unproven whether psychological factors have an influence on breast cancer incidence. In our earlier study, subjects possessing two personality traits, decisiveness and "ikigai" (a Japanese word meaning something that makes one's life worth living), showed a significantly lower risk of developing breast cancer, although no psychological factors have been convincingly demonstrated to have an influence on breast cancer development in other studies. Therefore, we conducted this follow-up analysis to confirm the association between breast cancer incidence and psychological traits, using the final dataset of a large-scale prospective cohort study in Japan. We identified 209 cases of incident breast cancer out of a maximum 21-year follow-up of 29,098 Japanese women. Cox proportional hazard regression analysis, adjusted for the same potential confounders used in our previous study, did not reveal any significant relationships between breast cancer incidence and four psychological traits: having "ikigai", decisiveness, ease of anger arousal, and perceived stress. Our finding is consistent with previous studies, and suggests that the psychological traits are unlikely to be an important risk factor for breast cancer.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Sawada T,Nishiyama T,Kikuchi N,Wang C,Lin Y,Mori M,Tanno K,Tamakoshi A,Kikuchi Sdoi
10.1038/srep32559subject
Has Abstractpub_date
2016-09-02 00:00:00pages
32559issn
2045-2322pii
srep32559journal_volume
6pub_type
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