Table 1.

Some studies on pulmonary metastasis of giant cell tumors of bone

Study (Author/year)	Time of follow up	Number of patients	Ratio of pulmonary metastasis
Errani et al. 2010 [32]	91 (36-204) months	349	4%
Kremen et al. 2012 [33]	0.1-312 months	230	2%
Takeuchi et al. 2011 [34]	2-180 months	110	7.5%
Klenke et al. 2011 [35]	108 (36-233)months	118	4.2%
Viswanathan et al. 2010 [36]	4 months-12 years	470	1.7
Balke et al. 2008 [37]	60 (8-280) months	214	3.3%
Donthineni et al. 2006 [38]	18-126months	51	13.7%
Faisham et al. 2006 [39]	12-60 months	20	30%
Dominkus et al. 2006 [30]	3 months to 11.9 years	649	2.1%
Prosser et al. 2005 [40]	70 (24-214) months	137	1.6%
Su et al. 2004 [41]	62 (28-138) months	87	1.2%
Trieb et al. 2001 [42]	11 (4-43) years	47	0%
Blackley et al. 1999 [43]	80 (29-132) months	59	1.7%
O’Donnell et al. 1994 [44]	4 (2-10) years	60	0%
Kay et al. 1994 [45]	23-120 months	66	9.1%
Campanacci 1 et al. 987 [1]	2-44 years	280	2.1%
McDonald et al. 1986 [46]	84 (min 24) months	146	3.2%