Table 2. Immunohistochemical Staining Results on Pineal Parenchymal Tumors.

Case Number	Tumor	Age (years)	Gender	CRX	GFAP	Synaptophysin
1	Pineocytoma	71	Female	2+	0	5+
2	Pineocytoma	56	Female	4+	0	4+
3	Pineocytoma	61	Male	4+	0	4+
4	Pineocytoma	54	Male	4+	3+	2+
5	PPTID	2	Male	4+	0	4+
6	PPTID	30	Male	2+	0	4+
7	PPTID	44	Female	4+	0	5+
8	PPTID	36	Female	4+	0	4+
9	Pineoblastoma	4	Male	4+	1+	5+
10	Pineoblastoma	12	Female	4+	0	5+
11	Pineoblastoma	13	Male	5+	0	5+
12	Pineoblastoma	9	Male	5+	1+	5+
13	Pineoblastoma	8	Female	0	0	4+

Table 2 Legend:

0 indicates no staining; 1+, <5% tumor cells reactive; 2+, 5% to 25% tumor cells reactive; 3+, 26% to 50% tumor cells reactive; 4+, 51% to 75% tumor cells.

reactive; 5+, >75% tumor cells reactive. GFAP, Glial Fibrillary Acid Protein; Pineal Parenchymal Tumor of Intermediate Differentiation (PPTID).