Table 2. Differences between fractions of tumors with homogeneous (3+) and negative MGMT immunoreactivity in the various subgroups of brain metastases.

	Breast carcinoma	Lung carcinoma	Melanoma
Renal cell carcinoma	p<0.0001	p<0.025	n.s.
Breast carcinoma		p<0.025	p<0.0001
Lung carcinoma			p<0.01