- 著者
-
矢野 友啓
- 出版者
- 公益社団法人 日本ビタミン学会
- 雑誌
- ビタミン (ISSN:0006386X)
- 巻号頁・発行日
- vol.89, no.12, pp.561-572, 2015-12-25 (Released:2017-08-10)
It is well known that vitamin E acts as a useful preventive agent against several types of cancers and stroke. However, there are conflicting results on a role of vitamin E in the prevention of these diseases. In order to clarify the conflicting results, meta-analysis of current results obtained from randomized controlled trials (RCTs) was conducted. Meta-analysis of 7 RCTs on cancer identified showed no significant difference on the effect of vitamin E supplementation on incidence and mortality in cancers tested. However, there was heterogeneity in the meta-analysis of prostate cancer incidence, indicating the possibility that vitamin E supplementation has a suppressive effect against the cancer in some cases. With respect to incidence and mortality in stroke, meta-analysis of 6 RCTs identified was conducted, and vitamin E supplementation significantly reduced the incidence of ischemic stroke, but not hemorrhagic stroke. Thus, it is suggested that vitamin E supplementation has a preventive effect on ischemic stroke.