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Radioembolization of hepatocarcinoma with 90Y glass microspheres: treatment optimization using the dose-toxicity relationship

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Abstract

Aim

Transarterial radioembolization (TARE) is, by all standards, a radiation therapy. As such, according to Euratom Directive 2013/59, it should be optimized by a thorough treatment plan based on the distinct evaluation of absorbed dose to the lesions and to the non-tumoural liver (two-compartment dosimetry). Since the dosimetric prediction with 99mTc albumin macro-aggregates (MAA) of non-tumoural liver is much more accurate than the same prediction on lesions, treatment planning should focus on non-tumoural liver rather than on lesion dosimetry. The aim of this study was to determine a safety limit through the analysis of pre-treatment dosimetry with 99mTc-MAA single photon emission computed tomography (SPECT/CT), in order to deliver the maximum tolerable absorbed dose to non-tumoural liver.

Methods

Data from intermediate/advanced hepato-cellular carcinoma (HCC) patients treated with 90Y glass microspheres were collected in this single-arm retrospective study. Injection was always lobar, even in case of bilobar disease, to avoid treating the whole liver in a single session. A three-level definition of liver decompensation (LD) was introduced, considering toxicity only in cases of liver decompensation requiring medical action (LD type C, LDC). We report LDC rates, receiver operating characteristic (ROC) analysis between LDC and NO LDC absorbed dose distributions, normal tissue complication probability (NTCP) curves and uni- and multivariate analysis of risk factors associated with toxicity.

Results

A 6-month timeline was defined as necessary to capture all treatment-related toxicity events. Previous transarterial chemoembolization (TACE), presence or extension of portal vein tumoural thrombosis (PVTT) and tumour pattern (nodular versus infiltrative) were not associated with tolerance to TARE. On the contrary, at the multivariate analysis, the absorbed dose averaged over the whole non-tumoural liver (including the non-injected lobe) was a prognostic indicator correlated with liver decompensation (odds ratio = 4.24). Basal bilirubin > 1.1 mg/dL was a second even more significant risk factor (odds ratio = 6.35). NTCP analysis stratified with this bilirubin cut-off determined a 15% liver decompensation risk at 50 Gy/90 Gy for bilirubin >/< 1.1 mg/dL. These results are valid for a 90Y glass microsphere administration 4 days after the reference time.

Conclusion

Given the low predictive accuracy of 99mTc-MAA on lesion absorbed dose reported by several authors, an optimized TARE with 90Y glass microspheres with lobar injection 4 days after reference time should aim at an absorbed dose averaged over the whole non-tumoural liver of 50 Gy/90 Gy for basal bilirubin higher/lower than 1.1 mg/dL, respectively.

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Acknowledgements

We thank Dr. Kirk Fowers of BTG Biocompatibles L.t.d. for useful discussions and suggestions. We acknowledge nuclear medicine technicians Monica Testoni, Dehborah Mansi, Sergio Bavusi, Consuelo Zanette, Rossana Pavesi and Marco Magistretti and CT technicians Roberto Gallo, Pietro Basile and Vanni Tirella for retrieving patient scans. We also acknowledge the head of nurses Rita Sicari for patient management.

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Correspondence to C. Chiesa.

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Conflict of interest

Carlo Chiesa received honoraria for consultancies from BTG Biocompatibles and Terumo. He also received a research grant from BTG Biocompatibles for this Investigator Initiated Study.

Marta Mira received a 15-month research grant from BTG Biocompatibles in order to perform this study.

Marco Maccauro, Carlo Spreafico, Sherrie Bhoori and Vincenzo Mazzaferro received honoraria as consultant and speakers from BTG Biocompatibles.

All the other authors have nothing to disclose.

Research on humans

The present Investigator Initiated Study (SPETc-DOSE-1) and the grant from BTG Biocompatibles were approved by the Ethics Committee and by the legal office of our Institution Fondazione IRCCS Istituto Nazionale Tumori (Committee for Trials on New Diagnostic and Therapeutic Methods—Comitato per la Sperimentazione dei Nuovi Metodi Diagnostici e Terapeutici, protocol number INT/99/17 Q/17/063). Our research has been performed in accordance with the ethical standards as cited in the 1964 Declaration of Helsinki.

Informed consent, for Cohort 3 thoroughly explaining the dosimetric optimization of treatment, was obtained from all patients before the 99mTc-MAA angioscintigraphic session (simulation). For Cohort 1, informed consent for the whole radioembolization procedure according to TheraSphere indication was obtained from all patients within the prospective phase II study [9].

Consent to retrospective clinical data collection was conducted according to the Italian legislation valid during the study. The corresponding author and P.I. of the study, Carlo Chiesa, signed a declaration stating that patients were not reachable at the time of the study since they died before the beginning of data collection.

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The medical physicist Marta Mira was temporarily supported for the present Investigator Initiated Study with a research grant received from BTG Biocompatibles L.t.d.

This article is part of the Topical Collection on Dosimetry.

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Chiesa, C., Mira, M., Bhoori, S. et al. Radioembolization of hepatocarcinoma with 90Y glass microspheres: treatment optimization using the dose-toxicity relationship. Eur J Nucl Med Mol Imaging 47, 3018–3032 (2020). https://doi.org/10.1007/s00259-020-04845-4

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