Lactoferrin (Lf) expression was investigated by using a Lf monoclonal antibody in 50 formalin-fixed and paraffin-embedded human bone tumours [10 giant cell tumours (GCTs), 7 osteoid osteomas, 6 ossifying fibromas, 19 enchondromas, 2 chondroblastomas, 2 chondrosarcomas, 2 chondroblastic