This is the protocol for a review and there is no abstract. The objectives are as follows:
To summarise the existing evidence regarding the effects of radiotherapy involving the chest for childhood, adolescent and young adult cancer on breast cancer risk in female cancer survivors. Firstly we will describe the overall breast cancer risk, as reported in all eligible studies. Secondly, we will summarise the breast cancer risk associated with (a) characteristics of treatment for a previous cancer, (b) survivor characteristics, and (c) modifying traditional predictors for breast cancer.