OBJECTIVES: I. Determine the maximum tolerated dose and dose limiting toxicities of high dose yttrium Y 90 monoclonal antibody MN-14 with or without doxorubicin plus peripheral blood stem cell rescue in patients with medullary thyroid cancer. II. Correlate organ and tumor dosimetry with toxicity and antitumor responses in these patients. III. Assess response and duration of response in these patients after this treatment.

OUTLINE: This is a dose escalation study of yttrrium Y 90 monoclonal antibody MN-14 (90Y-MN-14). Patients are stratified by prior doxorubicin (yes vs no). Patients receive filgrastim (G-CSF) subcutaneously (SQ) on days -11 to -7 and undergo leukapheresis on days -8 to -6. If an adequate number of CD34+ cells are not harvested, bone marrow is also collected. Patients receive pretherapy targeting consisting of indium In 111 monoclonal antibody MN-14 (In111-MN-14) on day 0. At least 1 confirmed tumor site must be targeted. Patients receive 90Y-MN-14 IV over 30-45 minutes on day 7. Some patients also receive doxorubicin IV on day 8. PBSC or bone marrow is reinfused on approximately day 7-14. Patients also receive G-CSF SQ or IV until blood counts recover. Cohorts of 3-6 patients receive escalating radiological doses of 90Y-MN-14 until the maximum tolerated dose (MTD) is determined. The MTD is defined as either the dose at which no more than 1 of 6 patients experiences dose limiting toxicity or the threshold radiation doses to lungs, kidneys, and liver. Patients are followed weekly for the first month, monthly for 3 months, then every 6 months for up to 5 years.

PROJECTED ACCRUAL: Approximately 30 patients will be accrued for each stratum of this study within 3 years.

DISEASE CHARACTERISTICS: Histologically or cytologically proven medullary thyroid carcinoma Unresectable local-regional disease OR Distant metastases Autologous peripheral blood stem cells (PBSC) or bone marrow available Diffuse bone/marrow involvement allowed if: Autologous bone marrow or PBSC with no greater than 5% tumor involvement available Radiation dose to marrow no greater than 3000 cGy until 6 patients have been treated safely at that dose level At least 1 site confirmed by CT targeted by pretherapy indium In 111 monoclonal antibody MN-14 imaging

PATIENT CHARACTERISTICS: Age: 16 to 80 Performance status: Karnofsky 60-100% ECOG 0-2 Life expectancy: At least 3 months Hematopoietic: WBC at least 3000/mm3 Granulocyte count at least 1500/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin no greater than 2 mg/dL Renal: Creatinine less than 1.5 times upper limit of normal Cardiovascular: Ejection fraction at least 50% Other: No severe anorexia, nausea, or vomiting No concurrent significant medical complications that would preclude compliance Not pregnant Fertile patients must use effective contraception during and for 3 months after study

PRIOR CONCURRENT THERAPY: Biologic therapy: At least 4 weeks since biologic therapy Chemotherapy: At least 4 weeks since prior chemotherapy and recovered No greater than 240 mg/m2 doxorubicin total for combination therapy with doxorubicin but no greater than 550 mg/m2 doxorubicin if radioimmunotherapy alone No prior failure on doxorubicin therapy for combination therapy but not radioimmunotherapy alone Endocrine therapy: Prior synthroid (T4) allowed Radiotherapy: See Disease Characteristics At least 4 weeks since prior radiotherapy to index lesion and recovered No prior radiotherapy to greater than 35% of red marrow Surgery: At least 4 weeks since prior major surgery