_:vb50950391 . _:vb50950391 . _:vb50950391 "url:https://www.ncbi.nlm.nih.gov/pubmed/23712252"^^ . _:vb50950391 . _:vb50950391 "A sarcoma and malignant tumor of rectum that is located_in the rectum."^^ . _:vb50950391 .