Risk of cancer following blood transfusion from donors with subclinical cancer

1 Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden 2 Department of Epidemiology Research, Statens Serum Institut, Copenhagen, Denmark 3 Department of Clinical Immunology and Transfusion Medicine, Karolinska University Hospital, Stockholm, Sweden 4 Department of Clinical Immunology, Odense University Hospital, Odense, Denmark 5 Department of Medicine, Clinical Epidemiology Unit, Karolinska Institutet, Stockholm, Sweden 6 Department of Clinical Immunology, Århus University Hospital, Århus, Denmark. 7 Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH, Bethesda, Maryland, USA 8 Division of Cancer Control and Population Sciences, National Cancer Institute, NIH, Bethesda, Maryland, USA