title: Letter: Passive immunity against childhood cancer.
mesh_terms: D000367:Age Factors; D001942:Breast Feeding; D001943:Breast Neoplasms / Q000517:prevention & control; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007112:Immunity, Maternally-Acquired; D007223:Infant; D007680:Kidney Neoplasms / Q000276:immunology; D009369:Neoplasms / Q000276:immunology*; D009447:Neuroblastoma / Q000276:immunology