EP300 and neoplasm: Similar tumor formation was observed in the mixed xenograft (MDA-MB-231EP300KD plus MDA-MB-231WT) and MDA-MB-231WT cells only xenografts, without any detection of EP300 KD (GFP positive) cells in the mixed xenograft (tumor volume: WT 1076.04 ± 257.3 mm3, mixed xenograft 1178.82 ± 405.16 mm3, EP300 KD clone 1 13.5 mm3) (Fig. 3e).