OUTLINE: This is a dose escalation study of yttrium Y 90 anti-CEA monoclonal antibody MN-14 (90Y-hMN-14). Patients undergo pretherapy imaging with indium In 111 anti-CEA monoclonal antibody MN-14 IV over 30-40 minutes on day -7 or -6, followed by external scintigraphy on days -7 or -6 to 0. Patients who show positive localization of at least one documented tumor site receive 90Y-hMN-14 IV over 30-40 minutes on day 0. Cohorts of 3-6 patients receive escalating doses of 90Y-hMN-14 until the maximum tolerated dose (MTD) is determined. The MTD is defined as the dose preceding that at which 2 of 6 patients experience dose-limiting toxicity. Patients are followed at 2, 4, 8, and 12 weeks; every 3 months for 2 years; and then every 6 months for 3 years.