Table 2. Immunohistochemical features of world’s 14 cases of primitive neuroectodermal tumors of the pancreas (1-5).

No. ICH features		Case
		1	2	3	4	5	6	7	8	9	10	11	12	13	14
P30/32MIC-2	CD99								P	SP				P	P
	O13	P	P	P	P	P	P	P			P	P
	HBA71										P
	12E7												P
	RFB1
AE1/AE3		P	P	P	P		N	P			SP	N	P	P	N
NSE		P	P	N	P	P	P	P		P	P	P	P	P	P
CHR		N	N	P	N	N	N		N	N	N	N	N		N
SYN		N	N	N	P	N	N	P	SP	P	N	N	N	P	N
EMA			P	N	P									P
DES			N	N	N		N	N		SP	N	N	N
INS		N	N	N									N
GLU		N	N	N									N
SOM		N	N	N									N
S-100									N	SP	N	P
VIM									P	N	P	P		P
Leu7									P
LCA									N				N		N
HMB-45											N	N		N
PAS												N			N
ACT													N
TDT															N
CD79a									N
CEA									N					N
CD43									N
CD3									N
NF									N

P, positive; N, negative; SP, sporadic positive. AE1/AE3, cytokeratin AE1/AE3; NSE, neuron specific enolase; CHR/CgA, chromogranin A; SYN, synaptophysin; EMA, epithelial membrane antigen; VIM, vimentin; DES, desmin; ACT, actin; INS, insulin; GLU, glucagon; SOM, somatostatin; NF, neurofilament protein; TDT, terminal deoxynucleotidyl transferase; LCA, leukocyte common antigen; PAS, Periodic Acid Schiff stain; HMB-45; CD43; CD3; LEU7; 14 our case