title: Utility of 111In-labelled leukocytes in patients completing high-dose interleukin-2 therapy: a pilot study.
abstract: Interleukin-2 (IL-2) therapy has resulted in modest response rates in patients with renal carcinoma and melanoma, but few reproducible pre- or post-treatment parameters have been associated with response, and tumour localization with lymphokine-activated killer cells has only occasionally been demonstrated. Eight patients (seven with renal carcinoma and one with melanoma) treated on a protocol with chronic indomethacin and ranitidine with three courses of continuous infusion of IL-2 had peripheral blood leukocytes withdrawn 12-36 h after completion of IL-2 therapy, labelled with 111In tropolone and reinjected. Images were taken at 4 and 20 h after reinjection. Three of these patients achieved objective responses to therapy, but none demonstrated uptake of radioisotope-labelled leukocytes in known tumour-bearing areas. Two nonresponding patients (one renal carcinoma, one melanoma) demonstrated uptake in all known tumour areas; one further nonresponding patient demonstrated uptake in the region of a femoral metastasis, but not in other bulky areas of disease. No correlation between scan uptake, and leukocyte subsets could be demonstrated. Although occasional patients demonstrate tumoural accumulations of 111In-labelled leukocytes after completion of therapy with IL-2, this does not appear to be associated with response.
authors.affiliation: Department of Medical Oncology, London Regional Cancer Centre, Ontario, Canada.
authors.forename: W C
authors.initials: WC
authors.lastname: Mertens
authors.forename: J E
authors.initials: JE
authors.lastname: Power
mesh_terms: D002292:Carcinoma, Renal Cell / Q000000981:diagnostic imaging / Q000628:therapy*; D006801:Humans; D007205:Indium Radioisotopes; D007376:Interleukin-2 / Q000627:therapeutic use*; D007680:Kidney Neoplasms / Q000000981:diagnostic imaging / Q000628:therapy*; D008545:Melanoma / Q000000981:diagnostic imaging / Q000628:therapy*; D010865:Pilot Projects; D011877:Radionuclide Imaging
chemical_list: D007205:Indium Radioisotopes; D007376:Interleukin-2