Table 1.

Patient characteristics on ARST0531 and D9803

	ARST0531	D9803	p-value
	N (%)	N (%)
Primary site  Favorable  Unfavorable	44 (10) 380 (90)	56 (12) 417 (88)	0.49
Group  Group I/II ARMS  Group III ERMS  Group III ARMS	55 (13) 228 (54) 141 (33)	74 (16) 252 (53) 147 (31)	0.48
Histology  Embryonal  Alveolar	228 (54) 196 (46)	221 (47) 252 (53)	0.88
Tumor size  ≤ 5cm  > 5cm	202 (48) 219 (52)	215 (46) 249 (54)	0.62
Parameningeal  Yes  No	191 (45) 233 (55)	186 (39) 287 (61)	0.08
Nodal Status  N0  N1	327 (78) 92 (22)	383 (81) 90 (19)	0.28
Modality of RT  Protons  Photons	47 (12) 345 (88)	9 (2) 407 (98)	<0.001
RT omission  Yes  No	32 (8) 392 (92)	57 (12) 416 (88)	0.02

Abbreviations: ARMS, alveolar rhabdomyosarcoma; ERMS, embryonal rhabdomyosarcoma; RT, radiation therapy