Star-PAP , a poly ( A ) polymerase , functions as a tumor suppressor in an orthotopic human breast cancer model .
B-GeneOrGeneProduct O O B-GeneOrGeneProduct I-GeneOrGeneProduct I-GeneOrGeneProduct I-GeneOrGeneProduct I-GeneOrGeneProduct O O O O B-DiseaseOrPhenotypicFeature O O O O B-OrganismTaxon B-DiseaseOrPhenotypicFeature I-DiseaseOrPhenotypicFeature O O