Comparison of Epidemiology, Clinical Features, and Outcomes of Patients with Reported Ewing Sarcoma and PNET over 40 Years Justifies Current WHO Classification and Treatment Approaches

Table 2

Clinical presenting features of patients with Ewing sarcoma and PNET ().

	Ewing sarcoma (N = 2945)	PNET (N = 630)	value
	N %	N %
Metastasis at diagnosis
Yes	323 (24.7)	74 (24.4)	0.941
No	984 (75.3)	229 (75.6)
Unknown	1638	327
Maximum tumor dimension
<8 cm	225 (51.2)	137 (51.7)	0.891
≥8 cm	493 (48.8)	128 (48.3)
Unknown	2227	375
Grade
Well, moderately, or poorly diff.	225 (31.3)	60 (35.5)	0.314
Undifferentiated	493 (68.7)	109 (64.5)
Unknown	2227	461
Primary site bone
Yes	2065 (70.1)	354 (56.2)	0.001
No	880 (29.9)	276 (43.8)
Primary site bone, axial
Yes	371 (18.0)	15 (4.2)	0.001
No	1694 (82.0)	339 (95.8)
Primary site bone, pelvis
Yes	446 (21.6)	20 (5.7)	0.001
No	1619 (78.4)	334 (94.3)

Among patients with bone primary tumors ( for ES; for PNET).