Production and Quality Control of [177Lu]Lu-PSMA-I&T: Development of an Investigational Medicinal Product Dossier for Clinical Trials

Valentina Di Iorio, Stefano Boschi, Cristina Cuni, Manuela Monti, Stefano Severi, Giovanni Paganelli, Carla Masini

Research output: Contribution to journalArticlepeer-review

Abstract

Since prostate cancer is the most commonly diagnosed malignancy in men, the theranostic approach has become very attractive since the discovery of urea-based PSMA inhibitors. Different molecules have been synthesized starting from the Glu-urea-Lys scaffold as the pharmacophore and then optimizing the linker and the chelate to improve functional characteristics. This article aimed to highlight the quality aspects, which could have an impact on clinical practice, describing the development of an Investigational Medicinal Product Dossier (IMPD) for clinical trials with [177Lu]Lu-PSMA-I&T in prostate cancer and other solid tumors expressing PSMA. The results highlighted some important quality issues of the final preparation: radiolabeling of PSMA-I&T with lutetium-177 needs a considerably longer time compared with the radiolabeling of the well-known [177Lu]Lu-PSMA-617. When the final product was formulated in saline, the stability of [177Lu]Lu-PSMA-I&T was reduced by radiolysis, showing a decrease in radiochemical purity (<95% in 24 h). Different formulations of the final product with increasing concentrations of ascorbic acid have been tested to counteract radiolysis and extend stability. A solution of 20 mg/mL of ascorbic acid in saline prevents radiolysis and ensures stability over 30 h.

Original languageEnglish
Article number4143
JournalMolecules
Volume27
Issue number13
DOIs
Publication statusPublished - Jun 28 2022

Keywords

  • Antigens, Surface
  • Ascorbic Acid/therapeutic use
  • Dipeptides/chemistry
  • Glutamate Carboxypeptidase II
  • Heterocyclic Compounds, 1-Ring/chemistry
  • Humans
  • Male
  • Prostate-Specific Antigen
  • Prostatic Neoplasms/drug therapy
  • Quality Control
  • Radiopharmaceuticals/chemistry
  • Urea

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