Table 6: Number of Cases and Percent of First Primary Central Nervous System Tumors by Behavior and Histology, 20-64 Year Olds, California, 2001-2005
Histology		ICD-O3 Histology Codes	Malignant		Benign		Uncertain		Total
			n	%	n	%	n	%	n	%
Tumors of the Neuroepithelial Tissue	Pilocytic astrocytoma	9421	0	0.0%	111	1.3%	0	0.0%	111	0.7%
	Diffuse astrocytoma (protoplasmic, fibrillary)	9410, 9420	56	1.1%	0	0.0%	0	0.0%	56	0.4%
	Anaplastic astrocytoma	9401, 9411	443	8.5%	0	0.0%	0	0.0%	443	3.0%
	Unique astrocytoma variants	9383, 9384, 9424	14	0.3%	0	0.0%	41	4.4%	55	0.4%
	Astrocytoma, NOS	9400, 9412	358	6.9%	0	0.0%	0	0.0%	358	2.4%
	Glioblastoma	9440, 9441, 9442	2,277	43.8%	0	0.0%	0	0.0%	2,277	15.4%
	Oligodendroglioma	9450	387	7.4%	0	0.0%	0	0.0%	387	2.6%
	Anaplastic oligodendroglioma	9451, 9460	179	3.4%	0	0.0%	0	0.0%	179	1.2%
	Ependymoma/Anaplastic ependymoma	9391, 9392, 9393	253	4.9%	0	0.0%	0	0.0%	253	1.7%
	Ependymoma variant, Myxopapillary	9394	0	0.0%	0	0.0%	111	11.8%	111	0.7%
	Mixed glioma	9382	264	5.1%	0	0.0%	0	0.0%	264	1.8%
	Glioma malignant, NOS	9380	183	3.5%	0	0.0%	0	0.0%	183	1.2%
	Choroid plexus	9390	<5	0.0%	21	0.2%	<5	0.1%	24	0.2%
	Neuroepithelial	9381, 9423, 9430, 9444	12	0.2%	0	0.0%	<5	0.1%	13	0.1%
	Neuronal/glial, neuronal and mixed	8680, 9413, 9490, 9492, 9493, 9500, 9501, 9505, 9506, 9508	16	0.3%	52	0.6%	109	11.6%	177	1.2%
	Pineal parenchymal	9360, 9361, 9362	20	0.4%	0	0.0%	17	1.8%	37	0.2%
	Primitive/Medulloblastoma	9470, 9471, 9472, 9473, 9474	110	2.1%	0	0.0%	0	0.0%	110	0.7%
Tumors of Cranial & Spinal Nerves	Nerve sheath tumors	9540, 9550, 9560, 9561, 9570	13	0.2%	2,037	23.5%	7	0.7%	2,057	13.9%
Tumors of Meninges	Meningioma	9530, 9531, 9532, 9533, 9534, 9537, 9538, 9539	79	1.5%	3,863	44.5%	237	25.2%	4,179	28.2%
	Other mesenchymal	8324, 8728, 8801, 8806, 8810, 8815, 8850, 8861, 8890, 8900, 8920, 9150, 9260	17	0.3%	18	0.2%	32	3.4%	67	0.5%
	Hemangioblastoma	9131, 9161, 9535	0	0.0%	12	0.1%	171	18.2%	183	1.2%
Lymphomas		9590, 9591, 9650, 9670, 9671, 9675, 9680, 9684, 9687, 9690, 9691, 9695, 9698, 9699, 9702, 9705, 9714, 9719, 9727, 9728, 9729, 9731, 9733, 9734, 9740, 9741, 9750, 9755, 9930	394	7.6%	0	0.0%	0	0.0%	394	2.7%
Germ Cell Tumors		9060, 9064, 9065, 9070, 9071, 9080, 9081, 9084, 9085	34	0.7%	12	0.1%	0	0.0%	46	0.3%
Tumors of Sellar Region	Pituitary tumors	8270, 8271, 8272, 8280, 8290, 8300,9580	11	0.2%	2,444	28.2%	0	0.0%	2,455	16.6%
	Craniopharyngioma	9350, 9351, 9352	0	0.0%	0	0.0%	159	16.9%	159	1.1%
Local Extensions from Regional Tumors	Chordoma	9370, 9371, 9372	15	0.3%	0	0.0%	0	0.0%	15	0.1%
Unclassifed Tumors	Hemangioma	9120, 9121, 9122, 9130, 9133	0	0.0%	66	0.8%	2	0.2%	68	0.5%
	Neoplasm, unspecified	8000, 8005, 8010	60	1.2%	40	0.5%	53	5.6%	153	1.0%
	All other	8720, 8728, 9580, 9751	5	0.1%	0	0.0%	0	0.0%	5	0.0%
Total			5,202		8,676		941		14,819