Overview
Giant cell tumor of bone (GCTB) is a benign but locally aggressive neoplasm characterized by a mixture of mononuclear stromal cells and multinucleated giant cells. Histologically, it can exhibit fibroblastic or histiocytic differentiation, suggesting a potential origin from cells capable of differentiating into fibroblasts or histiocytes 1.Diagnosis
Histological Features: Predominant patterns include fibroblastic or histiocytic differentiation with pleomorphism and multinucleated giant cells 1.
Immunohistochemistry: Positive staining for lysozyme and AI-antichymotrypsin, particularly in mononuclear and giant cells, supports diagnosis 1.
Imaging: MRI and CT scans help delineate tumor extent and involvement of bone and soft tissues 2.Management
Surgical Resection: Primary treatment often involves wide local excision or intralesional curettage, depending on location and size 3.
Adjuvant Therapy: For high-risk cases (e.g., recurrent or aggressive tumors), adjuvant therapies like denosumab may be considered to reduce recurrence risk 4.
Radiation Therapy: Rarely used due to limited efficacy and potential for complications 5.Special Populations
Pregnancy: Management strategies may need to be adapted to minimize risks to the fetus; surgical intervention should be carefully considered 6.
Pediatrics: Treatment approaches are similar to adults but require careful consideration of growth plate preservation 7.
Elderly: Surgical risks increase; tailored treatment plans focusing on minimal invasive approaches are recommended 8.Key Recommendations
Confirm diagnosis using histological examination with immunohistochemical markers for lysozyme and AI-antichymotrypsin (Evidence: Moderate 1).
Employ wide local excision or intralesional curettage as primary surgical interventions (Evidence: Expert opinion 3).
Consider adjuvant denosumab for high-risk cases to reduce recurrence rates (Evidence: Moderate 4).References
1 Bouropoulou V, Kontogeorgos G, Manika Z. A histological and immunoenzymatic study on the histogenesis of "giant cell tumor of bones". Pathology, research and practice 1985. link80076-5)