title: Phase I study of monoclonal antibody-ricin A chain immunoconjugate Xomazyme-791 in patients with metastatic colon cancer.
abstract: The immunoconjugate XMMCO-791/RTA consists of ricin A chain bound to a murine monoclonal antibody MoAb 791T. This monoclonal antibody (MoAb) binds to a glycoprotein of 72 kD, which is expressed on human colorectal carcinoma, ovarian carcinoma, and osteogenic sarcoma. XMMCO-791/RTA was tested in a Phase I trial with proposed dose escalation steps of 0.02, 0.04, 0.15, and 0.2 mg/kg per day. Twelve patients with metastatic colorectal carcinoma were treated at 0.02, 0.03, and 0.04 mg/kg per day dose levels administered over 1 hour on days 1-5. Study-related toxicities were hypotension (6 patients); greater than 10% weight gain (6 patients); peripheral edema (9 patients); fever (4 patients); confusion (3 patients); diarrhea (3 patients); proteinuria, as identified by dipstick (3 patients), greater than 0.6 mg/dl decrease in serum albumin (11 patients); greater than 25% decrease in oncotic pressure (10 patients), and a decrease in ionized calcium (8 patients). Six patients received a second course of treatment. HAMA levels developed in 9 patients and titers increased with number of courses administered. Decreased overall toxicity, in comparison to the first course, was noted, but one patient had an allergic-type response (hypotension, crushing chest pain, diaphoresis) after the test dose of the second course (HAMA level > 10,000 IgG). Life-threatening toxicity in the form of fluid shift, resulting in noncardiac pulmonary edema and third-spacing occurred after course 1 in 1 of 3 patients at the 0.04 mg/kg per day level. No further dose escalation was attempted and no antitumor activity was seen.
authors.affiliation: Department of Internal Medicine, Wayne State University School of Medicine, Harper Hospital, Detroit, Michigan 48201, USA.
authors.forename: P M
authors.initials: PM
authors.lastname: LoRusso
authors.forename: P L
authors.initials: PL
authors.lastname: Lomen
authors.forename: B G
authors.initials: BG
authors.lastname: Redman
authors.forename: E
authors.initials: E
authors.lastname: Poplin
authors.forename: J J
authors.initials: JJ
authors.lastname: Bander
authors.forename: M
authors.initials: M
authors.lastname: Valdivieso
mesh_terms: D000230:Adenocarcinoma / Q000188:drug therapy* / Q000276:immunology / Q000556:secondary*; D000368:Aged; D000818:Animals; D000888:Antibodies, Anti-Idiotypic / Q000097:blood; D000911:Antibodies, Monoclonal / Q000008:administration & dosage / Q000009:adverse effects / Q000276:immunology / Q000627:therapeutic use*; D002272:Carcinoembryonic Antigen / Q000097:blood; D003110:Colonic Neoplasms / Q000188:drug therapy* / Q000276:immunology; D015179:Colorectal Neoplasms / Q000188:drug therapy / Q000276:immunology; D004305:Dose-Response Relationship, Drug; D004334:Drug Administration Schedule; D006801:Humans; D000922:Immunotoxins / Q000008:administration & dosage / Q000009:adverse effects / Q000276:immunology / Q000627:therapeutic use*; D051379:Mice / Q000276:immunology; D008875:Middle Aged; D012276:Ricin / Q000008:administration & dosage / Q000009:adverse effects / Q000276:immunology / Q000627:therapeutic use*
chemical_list: D000888:Antibodies, Anti-Idiotypic; D000911:Antibodies, Monoclonal; D002272:Carcinoembryonic Antigen; D000922:Immunotoxins; C059257:XomaZyme; D012276:Ricin