This book provides readers with the most up-to-date practical information on breast cancer screening. Since breast cancers are highly heterogeneous, time to clinical onset from the initial carcinogenesis differs diversely between cancers. Pathological germline variants and driver mutations cause a high lifetime risk of breast cancer. The lifetime risks are various according to what genes are pathologically dysfunctional. Integrated omics and imaging technologies have established varying tumour characteristics. Thus, this book suggests that a more individualised scheme is required to improve breast cancer screening.