[wpfilebase tag=file id=138 /]Probiotics are live microbial food supplements or components of bacteria, which have been shown to have beneficial effects on human health. Probiotic bacteria are used to treat or prevent a broad range of human diseases. Cancer is one of the most important deaths causing in the world and many factors as chemicals, rays, viruses and genetic factors may influence it. There are many studies that have been suggested using of probiotic products as cancer risk reducer. The aim of this review is to consider the current evidence on the effects of probiotics on human health and decrease cancer.