Table 1. Patient characteristics.

A. Patients with matched tumor-germline-plasma samples
Pt	Age (yrs)	Primary site of disease	Metastatic sites	Treatment protocol	Currently disease free (months of disease-free follow up)
A	35	R. Forearm	None	MAP	Yes (22)
B	9	Occipital Skull	None	MAP	Yes (22)
C	18	L fibula	None	MAP	Yes (41)
D	20	L Rib	Single Lung Nodule	MAP	Yes (25)
E	20	L Femur	> 15 Lung Nodules	MAP, Dinutuximab	No, Deceased
F	10	R Femur	> 15 Lung Nodules	MAP	No
G	22	L Distal Femur	Single Lung Nodule	MAP	No
B. Patients with matched germline-plasma samples
Pt	Age (yrs)	Primary site of disease	Metastatic sites	Treatment protocol	Currently disease free (months of disease-free follow up)
H	10	Multifocal	5 Lung Nodules	MAP	No, Deceased
I	23	Sacrum	None	MAP	Yes (24)
J	11	R Femur	None	MAP	Yes (10)

Note: MAP therapy consists of Methotrexate, Doxorubicin, & Cisplatin