This Protocol aims to provide long-term follow-up of breast cancer and multiple myeloma subjects previously receiving autologous primitive marrow and blood hematopoietic cells exposed to gene transfer retroviral vectors on the following protocols: MB 294 (92-C-0161; T-92-0018), MB 310 (93-C-0208; T-92-0192), MB 361 (96-C-0007; T-95-0096) or (92-H-0057; T-92-0139) at the National Cancer Institute and the National Heart, Lung, and Blood Institute. Subjects will undergo an annual health history and annual complete blood counts will be performed. Blood samples will also be collected annually (either locally or off-site by the subjects' personal physicians) for testing for presence of the gene transfer vector and vector integration sites.
