Table 1.

Most common primary tumors responsible for brain metastases in this study cohort. NSCLC = non-small-cell lung cancer; SCLC = small-cell lung cancer; ER = estrogen receptor; HER = human epidermal receptor; RCC = renal cell carcinoma; CUP = cancer of unknown primary.

Primary Tumor	n (%)
Lung	89 (44.7%)
NSCLC	75 (37.9%)
SCLC	12 (6.1%)
Mamma	23 (11.6%)
ER+	4 (2%)
HER2+	7 (3.5%)
ER+/HER2+	3 (1.5%)
Triple-	8 (4%)
RCC	5 (2.5%)
Colon	8 (4%)
CUP	6 (3%)
Other	41 (20.6%)