Log2 ratio reflects the ratio of tumor. The genome profiles of mixed-DNA samples comprising various ratios were superimposed. Gain was detected in chromosome 7 of all mixed samples, as shown by the log2 ratio: SP-49 = 0.55; 100%, 7:3 = 0.46; 70%, 6:4 = 0.32; 60%, 3:7 = 0.20; 30%. Loss was also detected in chromosome 7 of all mixed samples as shown by the log2 ratio: Sp-49 = −0.88; 100%, 7:3 = −0.62; 70%, 6:4 = −0.39; 60%, 3:7 = −0.14; 30%. Chromosome 2p had a copy region identical to both SP-49 and HANK1. The log2 ratios never changed in these regions.