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Bone morphogenetic protein (BMP) has been shown to be one of the significant factors in the prognosis of bone tumours. In normal development BMP induces new bone formation and later takes part in fracture healing, but its function in malignant tumours is not known. In this study the concentration of bone morphogenetic protein was measured in primary bone tumours by two methods. Local staining intensity was detected immunohistologically by the avidin-biotin-peroxidase method determining the highest dilution of anti-serum against bovine bone morphogenetic protein. The total amount of BMP in a tumour sample was measured by an enzyme-linked immunosorbent assay technique after digesting the tissue with collagenase to remove proteins from the connective tissue. Immunohistochemical staining showed that bone morphogenetic protein was present in the cytoplasm and in reactive bone formed by malignant cells. The local concentration was highest in the tissue of giant cell tumours compared to chondrosarcoma, osteosarcoma and benign bone tumours. The total amount in malignant bone tumours was 2.4 times higher compared to benign bone tumours.

Measurement of total and local bone morphogenetic protein concentration in bone tumours