TABLE 2.

Frequency of brain metastases according to histologic subtypes of the primary lung cancer by arterial territories.

Histology	ACA			MCA			PCA			CB	p-value
	P	M	D	P	M	D	P	M	D
Small cell carcinoma	0.69 ± 0.72	0.62 ± 0.62	0.38 ± 0.62	0.77 ± 1.42	0.69 ± 0.91	0.54 ± 1.01	0.69 ± 1.64	0.46 ± 1.15	0.46 ± 0.93	2.46 ± 3.67	0.07
Adenocarcinoma	0.67 ± 1.14	0.66 ± 1.04	0.88 ± 1.23	0.86 ± 1.46	1.47 ± 1.76	1.79 ± 2.24	0.60 ± 0.91	0.71 ± 0.97	0.64 ± 1.09	1.62 ± 2.54	<0.01*
Squamous cell carcinoma	0.33 ± 0.67	0.67 ± 0.82	0.22 ± 0.42	0.11 ± 0.31	0.89 ± 0.74	1.00 ± 1.15	0.33 ± 0.47	0.44 ± 0.83	0.11 ± 0.31	0.33 ± 0.67	0.11

One-way analysis of variance was used to compare BM frequencies among arterial territories. This model was adjusted for age, sex, and the area of the arterial territory. Data shown are mean BM frequencies with standard deviations. Asterisk (*) indicates a p-value <0.05. ACA, anterior cerebral artery; BM, brain metastasis; MCA, middle cerebral artery; PCA, posterior cerebral artery; CB, cerebellum; P, proximal; M, middle; D, distal.