A primary or metastatic malignant neoplasm involving any part of the gastrointestinal system. check for "https://www.cancer.gov/about-cancer/treatment/clinical-trials/intervention/c4890" active clinical trials using this agent. ("http://ncit.nci.nih.gov/ncitbrowser/conceptreport.jsp?dictionary=nci%20thesaurus&code=c4890" nci thesaurus)