Acts as a transcriptional transactivator of TCEA1 elongation activity (By similarity). Acts as a transcriptional transactivator of ELL and ELL2 elongation activities. Potent inducer of apoptosis in prostatic and non-prostatic cell lines. Inhibits prostate tumor growth in vivo. {ECO:0000250, ECO:0000269|PubMed:12446457, ECO:0000269|PubMed:12907652, ECO:0000269|PubMed:16006523}. This is the function of EAF2 (ELL associated factor 2, Ensembl gene identifier ENSG00000145088).