EIF3A and neoplasm: However, some of these proteins or their homologues have already been recognized as tumour antigens by SEREX in other types of cancer, such as the JK recombination signal binding protein, eIF2B (a homologue of eIF3) (Gure et al, 2000), and hsp70 (a homologue of hsp90) (Scanlan et al, 1998).