Abstract
The aim of this study was to determine the maximum tolerated dose of (90)Y-DOTATOC per cycle administered in association with amino acid solution as kidney protection in patients with somatostatin receptor-positive tumours. Forty patients in eight groups received two cycles of (90)Y-DOTATOC, with activity increased by 0.37 GBq per group, starting at 2.96 and terminating at 5.55 GBq. All patients received lysine +/- arginine infusion immediately before and after therapy. Forty-eight percent developed acute grade I-II gastrointestinal toxicity (nausea and vomiting) after amino acid infusion whereas no acute adverse reactions occurred after (90)Y-DOTATOC injection up to 5.55 GBq/cycle. Grade III haematological toxicity occurred in three of seven (43%) patients receiving 5.18 GBq, which was defined as the maximum tolerable activity per cycle. Objective therapeutic responses occurred. Five GBq per cycle is the recommended dosage of (90)Y-DOTATOC when amino acids are given to protect the kidneys. Although no patients developed acute kidney toxicity, delayed kidney toxicity remains a major concern, limiting the cumulative dose to ~25 Gy. The way forward with this treatment would seem to be to identify more effective renal protective agents, in order to be able to increase the cumulative injectable activity and hence tumour dose.
Publication types
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Clinical Trial
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Clinical Trial, Phase I
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Controlled Clinical Trial
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Research Support, Non-U.S. Gov't
MeSH terms
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Adult
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Aged
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Amino Acids / administration & dosage*
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Amino Acids / adverse effects*
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Biomarkers, Tumor / metabolism
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Blood Platelets / radiation effects
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Dose-Response Relationship, Drug
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Dose-Response Relationship, Radiation
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Female
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Hemoglobins / radiation effects
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Humans
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Kidney / drug effects
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Kidney / radiation effects
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Lymphocytes / radiation effects
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Male
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Maximum Tolerated Dose
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Metabolic Clearance Rate
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Middle Aged
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Nausea / etiology
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Neoplasms / diagnostic imaging
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Neoplasms / metabolism
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Neoplasms / radiotherapy*
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Neoplasms / therapy
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Octreotide / administration & dosage
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Octreotide / adverse effects*
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Octreotide / analogs & derivatives*
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Octreotide / pharmacokinetics
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Octreotide / therapeutic use*
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Radiation-Protective Agents / administration & dosage
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Radiation-Protective Agents / adverse effects
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Radiometry / methods
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Radionuclide Imaging
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Radiopharmaceuticals / administration & dosage
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Radiopharmaceuticals / adverse effects
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Radiopharmaceuticals / therapeutic use
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Receptors, Somatostatin / metabolism
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Renal Insufficiency / etiology
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Vomiting / etiology
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Yttrium Radioisotopes / administration & dosage
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Yttrium Radioisotopes / adverse effects
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Yttrium Radioisotopes / therapeutic use
Substances
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Amino Acids
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Biomarkers, Tumor
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Hemoglobins
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Radiation-Protective Agents
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Radiopharmaceuticals
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Receptors, Somatostatin
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Yttrium Radioisotopes
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Octreotide
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Edotreotide