Therapeutic evaluation of [212Pb]Pb-AB001 and [177Lu]Lu-PSMA-617 in a mouse model of disseminated prostate cancer
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View abstract on PubMed
Summary
This summary is machine-generated.The alpha-emitting [212Pb]Pb-AB001 showed superior efficacy in treating prostate cancer micrometastases and preventing bone metastases compared to the beta-emitting [177Lu]Lu-PSMA-617 in a mouse model.
Area Of Science
- Nuclear medicine
- Oncology
- Radiopharmaceutical therapy
Background
- Metastatic castration-resistant prostate cancer (mCRPC) has a poor prognosis, often involving bone and soft tissue metastases.
- Current treatments like [177Lu]Lu-PSMA-617 may be less effective against micrometastatic disease.
- Alpha-emitting [212Pb]Pb-AB001 offers high-energy, short-range delivery for potentially enhanced efficacy.
Purpose Of The Study
- To compare the efficacy of [212Pb]Pb-AB001 and [177Lu]Lu-PSMA-617 in a mouse model of disseminated prostate cancer.
- To evaluate their effectiveness against micrometastatic and bone metastases.
Main Methods
- In vitro binding and internalization assays were performed.
- A mouse model of prostate cancer was established via intracardiac injection of PC-3 PIP-luc cells.
- Mice were treated with varying activities of [212Pb]Pb-AB001 or [177Lu]Lu-PSMA-617, followed by bioluminescence imaging, µPET/µCT, gamma-autoradiography, and radiography to assess metastatic burden and radioligand distribution.
Main Results
- Both radioligands showed comparable in vitro binding.
- [212Pb]Pb-AB001 treatment resulted in a median survival of 47 days, significantly longer than controls (25 days) and [177Lu]Lu-PSMA-617 (27 days).
- [212Pb]Pb-AB001 prevented bone metastases, while [177Lu]Lu-PSMA-617 showed an activity-dependent reduction. Focal [212Pb]Pb-AB001 distribution indicated heterogeneous micrometastases.
Conclusions
- [212Pb]Pb-AB001 demonstrated significant efficacy against micrometastases and early bone metastases in this model.
- It showed advantages over [177Lu]Lu-PSMA-617 at investigated activities, suggesting clinical potential for mCRPC treatment.
- Further studies on dosimetry and toxicity are required for clinical application.
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