For BRCA1 CNV detection by ddPCR, the normal cells control, healthy volunteers, and advanced prostate cancer patients with normal final ratios from MLPA exhibited values of 2.0 ± 0.1, 1.9 ± 0.1, and 1.6 ± 0.2, respectively, with no significant differences among these groups. The gene discussed is BRCA1; the disease is Familial prostate cancer.