Fig. 7

PCA plot showing a: (a) comparison of plasma samples from healthy controls, patients with primary colorectal carcinoma (CRC) and patients with brain metastasis derived from colorectal carcinoma (BMC); (b) comparison of plasma samples from healthy controls and patients with primary CRC, BMC, BM from breast carcinoma (BMB), BM from non-small cell lung carcinoma (BML), BM from melanoma (BMM), and BM from renal clear cell carcinoma (BMR).