Polycomb group (PcG) proteins assemble into multimeric protein complexes, which are involved in maintaining the transcriptional repressive state of genes throughout development (1). PHC3 (Polyhomeotic-like protein 3), also known as Early development regulatory protein 3, is a 983 amino acid nuclear protein that is a component of the PcG multiprotein PRC1 complex (2). PRC1 complex acts via chromatin remodeling and modification of histones. PHC3 contains 1 FCS-type zinc finger and SAM (sterile alpha motif) domain (2-3). PHC 3 has been regarded as a candidate tumor suppressor of osteosarcoma (4).