We cloned the human SOX4 gene into this vector to generate an amino-terminal fusion to a BirA recognition sequence to produce transiently expressed, intracellularly biotinylated SOX4 protein in LNCaP prostate cancer cells, and purified SOX4 complexes with streptavidin-linked magnetic beads to perform large scale proteomics analysis. This evidence concerns the gene SOX4 and Familial prostate cancer.