Phase I/IIa clinical trial of ⁶⁸Ga-PSMA-11 synthesized by a newly developed automated module using cyclotron-generated ⁶⁸Ga.

Authors

Shigeyasu Sugawara, Shozo Okamoto, Noriko Kanno, Naoyuki Ukon, Taiki Joho, Kazuhiro Takahashi, Seiji Hoshi, Yoshiyuki Kojima, Yuko Hashimoto, Yoichi M Ito, Kazuhiko Hanada, Masao Kobayakawa, Noboru Oriuchi, Tohru Shiga

Published in

Annals of nuclear medicine. Jul 24, 2026. Epub Jul 24, 2026.

Abstract

This Phase I/IIa study evaluated the safety, pharmacokinetics, internal radiation dosimetry, and image quality of cyclotron-produced ⁶⁸Ga-PSMA-11 synthesized using an automated module in a Japanese population.
In this single-center trial, nine Japanese men (3 healthy volunteers, 6 prostate cancer patients) received a single intravenous injection of ⁶⁸Ga-PSMA-11 (4.0 MBq/kg). Safety, pharmacokinetics (blood/urine), and internal radiation dosimetry (serial PET/CT) were assessed. Diagnostic performance was evaluated by lesion detection rates and image quality by quantitative metrics, including noise-equivalent count (NEC), to optimize the protocol.
No adverse events were observed. The automated synthesis process consistently yielded high-quality ⁶⁸Ga-PSMA-11, with a decay-corrected radiochemical yield of 2841 ± 584 MBq and a radiochemical purity > 99%. The kidneys received the highest absorbed dose, with an effective dose comparable to that reported in published data. The agent demonstrated rapid clearance, primarily via renal excretion (58.99% ± 11.34% in 6 h), with a biological half-life of approximately 3.8 h in whole blood. All histopathology-confirmed primary lesions were detected. Quantitative analysis indicated that high image quality was maintained even with substantially reduced acquisition times.
Cyclotron-produced ⁶⁸Ga-PSMA-11 is safe and exhibits favorable pharmacokinetics and dosimetry in a Japanese population. This exploratory Phase I/IIa trial suggests that the production method appears feasible.
jRCT2022230014.

PMID:
42496850
Bibliographic data and abstract were imported from PubMed on 24 Jul 2026.

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