Table 1.

Classification of the samples studied by age and clinical characteristics (n = 1300)

Clinical characteristic	Number of patients (%)
Gender
Male	593 (45.6)
Female	707 (54.4%)
Age at diagnosis
Median (range)	63 (19–90)
Tumor type
Colorectal	354 (27.2%)
Lung	223 (17.2%)
Breast	172 (13.2%)
Prostate	83 (6.4%)
Melanoma	65 (5%)
Lymphoma	49 (3.8%)
Gastric	45 (3.5%)
Head and neck	45 (3.5%)
Bladder	38 (2.9%)
Ocular melanoma	32 (2.5%)
Endometrial	29 (2.2%)
Kidney	28 (2.2%)
Ovary	24 (1.8%)
Brain	24 (1.8%)
Oesophagus	22 (1.7%)
Pancreas	19 (1.5%)
Liver	16 (1.2%)
Testis	16 (1.2%)
Thyroid	13 (1%)
Sarcoma	3 (0.2%)
Origin of the tumors
Primary tumor	1166 (89.7%)
Metastasis	44 (3.4%)
Unknown	90 (6.9%)