Table 3.

Number and rates of new pulmonary metastatic events by grade across standard surveillance time intervals*

Sarcoma grade	Years posttreatment	New lung metastasis events/patient-year	Number of patients needed to screen to detect 1 new metastatic event/year	Proposed screening frequency
Low	0–5	0.023	44	12 months
	5–10	0	-	None
	> 10	0	-	None
Int.	0–2	0.52	2	3 months
	2–5	0.029	35	12 months
	5–10	0.026	39	12 months
	> 10	0.0038	264	None
High	0–2	0.66	2	3 months
	2–5	0.11	10	6 months
	5–10	0.018	56	12 months
	> 10	0.0012	834	None

* The number of patients needed to be screened to detect one patient with new metastasis per year is listed.