6 matokeo
BACKGROUND
Giant cell tumors (GCTs) of bone are primary benign bone tumors that are characterized by a high number of osteoclast-like multinuclear giant cells (MNCs). Recent studies suggest that the spindle-shaped stromal cells in GCTs are tumor cells, while monocyte-like cells and MNCs are reactive
1. An aminopeptidase that preferentially releases tyrosine residues from synthetic substrates has been purified from human osteoclastomas. This enzyme also hydrolyses dipeptides having an N-terminal tyrosine and a hydrophobic carboxy-terminal amino acid. 2. The tyrosyl-aminopeptidase consists of two
Overexpression of the hepatocyte growth factor receptor (Met/HGF receptor), a transmembrane tyrosine kinase encoded by the MET proto-oncogene, is involved in transformation and invasive behavior of human carcinomas and sarcomas. We have previously found that bone sarcomas express high levels of
"Knockout" of the src proto-oncogene in mice resulted in the unexpected development of osteopetrosis which was shown subsequently in 4-6 week old src-mutants to be due to failure of src-mutant osteoclasts to form ruffled borders. Histomorphometric analysis of vertebrae and humeri from 9-10 month old
Systemic treatment options for bone and soft tissue sarcomas remained unchanged until the 2000s. These cancers presented challenges in new drug development partly because of their rarity and heterogeneity. Many new molecular targeting drugs have been tried in the 2010s, and some were approved for
We report a very rare case of a dedifferentiated chondrosarcoma mimicking a benign giant cell tumor. A 22-year-old male was admitted to our hospital with a history of mild left wrist pain after a skiing trauma. Radiology revealed an extensive meta-epiphyseal osteolytic lesion in the distal ulna,