Table 1.

Patient demographics.

Patients Characteristics	Total Number of Patients (n = 64)
Median age at diagnosis (years)	66
Sex:
Male	22 (34.4%)
Female	42 (65.6%)
Type of cancer:
GI cancer	20 (31.2%)
Lung cancer	19 (29.7%)
Breast cancer	12 (18.7%)
Other malignancies	13 (20.3%)
Median time between tissue biopsy and blood specimen collection	20.5 months
Biopsy site
Primary tumor	38 (59%)
Metastatic site	26 (41%)
Tumor stage
Stage III	8 (12.5%)
Stage IV	56 (87.5%)