Table 1. Lung Cancer and SSc: Summary of Four Major Studies.

	SIR	Number of patients	Years of follow-up
Kuo et al [25]	4.2	2,053	1996 - 2008
Hill et al [26]	5.9	441	1993 - 2000
Rosenthal et al [27]	4.9	917	1965 - 1983
Chatterjee et al [28]	1.23	538	1973 - 2004