Risk factors for pulmonary metastases from giant cell tumor of bone.

BACKGROUND Giant cell tumor (GCT) of bone is a rare, benign, aggressive bone tumor with an unusual capacity to metastasize to the lung. It was the goal of this study to identify patient and treatment-specific variables associated with the development of pulmonary metastases of GCT of bone. METHODS From 1980 to 2009, 291 patients with benign GCT of bone were treated at our institution, and 167 were followed for at least two years. Eleven (6.6%) of these 167 patients developed biopsy-confirmed pulmonary metastasis. All patients were evaluated relative to nine patient, disease, and treatment-specific variables. RESULTS We identified four properties of benign GCT of bone associated with an increased risk of metastasis on univariate analysis: age at diagnosis, axial location of the primary GCT, primary Enneking stage-3 disease, and local recurrence. Multivariate analysis showed local recurrence to be an independent risk factor for pulmonary metastasis (adjusted odds ratio, 7.42). CONCLUSIONS There is an increased risk of pulmonary metastasis of GCT of bone in patients who are younger, present with Enneking stage-3 disease, develop local recurrence, and/or present with axial disease. The mode of treatment was not found to be associated with the development of pulmonary metastasis.

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