Flaxseed, Linum usitatissimum, is a member of the genus Linum in the family Linaceae. It is a food and fiber crop cultivated in cooler regions of the world. The aim of this study is to overview its anti-cancer and anti-tumor effects. This review article was carried out by searching studies in PubMed, Medline, Web of Science, and IranMedex databases up to 2016.totally, of 108 found articles, 41 articles were included. The search terms were “Flaxseed. ”, “therapeutic”, “pharmacological”, anticancer, anti-tumor. Various studies have shown that Flaxseed. Possess Anti-Breast Cancer properties, Anti-Breast tumors properties , Anti-Ovary cancer properties, Gut-associated diseases properties, Lung tumor properties, Inflammation properties, Anti-Skin Carcinogenesis properties, Procarcinogenic, Mastalgia properties, Aortic remodeling ,Anti-mammary Cancer effect ,Antioxidant and Antiproliferative ,Colon cancer properties, Esophagitis properties, Apoptosis properties. Flaxseed possess lots of therapeutic and pharmacological effects.in this study, its anticancer, anti-tumor effects was overviewed.