DOCK4 and Familial prostate cancer: Analysis of disease-free survival using the Gene Expression Profiling Integrative Analysis (GEPIA; http://gepia.cancer-pku.cn) showed that high expression of DOCK4 in prostate cancer tissues was associated with a shorter lifespan of patients (p = 0.032) (Supplementary Figure 4C), indicating that high level of DOCK4 correlates with poor prognosis of prostate cancer patients.