Table 4.

Number of patients with the incidence of pulmonary metastasis of giant cell tumors of bone

Study (Author/year)	Number of patients	Cases with pulmonary metastasis	Survivors at the last follow up
Kremen et al. 2012 [33]	230	5	4
Takeuchi et al. 2011 [34]	110	8	8
Errani et al. 2010 [32]	349	14	10*
Klenke et al. 2011 [35]	118	5	4
Viswanathan et al. 2010 [36]	470	8	8
Faisham et al. 2006 [39]	20	6	5
Dominkus et al. 2006 [30]	649	14	14
Donthineni et al. 2006 [38]	51	7	5
Kay et al. 1994 [45]	7	7	6

*3 of the 4 patients died of causes irrelevant to GCTB.