Low-dose, Fractionated Radioimmunotherapy for B-cell Malignancies Using 131I-Lym-1 Antibody

Cancer Biother Radiopharm. 1998 Aug;13(4):239-54. doi: 10.1089/cbr.1998.13.239.


Purpose: This trial was conducted to assess the toxicity and efficacy of 131I-Lym-1 in patients with either malignant B-cell non-Hodgkin's lymphoma (NHL) or chronic lymphocytic leukemia (CLL) using low-dose, fractionated radioimmunotherapy (RIT).

Materials and methods: Thirty adult patients who had advanced B-cell malignancies (25 NHL and 5 CLL) had progressed despite standard therapy; 12 patients entered the trial with Karnofsky performance status (KPS) of equal to or greater than 60. Patients were treated with a series of intravenous doses of 131I-Lym-1 with a goal of reaching a cumulative dose in each patient of at least 300 mCi. All patients were Lym-1 reactive. Clinical responses and immediate toxicity were evaluable in all 30 patients and delayed toxicity in 26.

Results: Toxicity to Lym-1 antibody occurred with 28% of the 176 doses and was transient. Human antimouse antibodies (HAMA) were generated in 30% after a mean of 4 doses, but interrupted therapy in only 10% of the patients. Thrombocytopenia was dose-limiting; there were no deaths due to toxicity. Tumor regression occurred in 25 (83%) of the patients and was great enough, and durable enough, in 17 (57%) to qualify them as responders; 13 NHL patients and 4 CLL patients. Advanced disease often interrupted therapy prematurely. However, 18 patients received at least 180 mCi of 131I-Lym-1; 17 (94%) of these responded to the therapy.

Conclusion: Although advanced disease often interrupted therapy prematurely, the results from 131I-Lym-1 therapy are clearly promising and warrant additional trials.

Publication types

  • Clinical Trial
  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adult
  • Aged
  • Antibodies, Monoclonal / adverse effects*
  • Antibodies, Monoclonal / therapeutic use
  • Antibodies, Monoclonal, Murine-Derived
  • Dose Fractionation, Radiation*
  • Female
  • Humans
  • Iodine Radioisotopes / adverse effects
  • Iodine Radioisotopes / therapeutic use
  • Leukemia, Lymphocytic, Chronic, B-Cell / pathology
  • Leukemia, Lymphocytic, Chronic, B-Cell / radiotherapy*
  • Lymphoma, B-Cell / pathology
  • Lymphoma, B-Cell / radiotherapy*
  • Male
  • Middle Aged
  • Neoplasm Staging
  • Radioimmunotherapy* / adverse effects
  • Radiopharmaceuticals / adverse effects
  • Radiopharmaceuticals / therapeutic use*
  • Tomography, Emission-Computed, Single-Photon


  • Antibodies, Monoclonal
  • Antibodies, Monoclonal, Murine-Derived
  • Iodine Radioisotopes
  • Lym-1 monoclonal antibody
  • Radiopharmaceuticals