Abstract
Background and purpose
Renal cell carcinoma (RCC) has traditionally been considered radioresistant with a limited role for conventional fractionation as a local approach. Nevertheless, since the appearance of stereotactic body radiation therapy (SBRT), radiotherapy (RT) has been increasingly employed in the management of metastatic RCC (mRCC). The aim of this study was to evaluate the role of SBRT for synchronous and metachronous oligo metastatic RCC patients in terms of local control, delay of systemic treatment, overall survival and toxicity.
Patients and methods
A Monocentric single institution retrospective data collection was performed. Inclusion criteria were: (1) oligo-recurrent or oligo-progressive disease (less than 5 metastases) in mRCC patients after radical/partial nephrectomy or during systemic therapy, (2) metastasectomy or other metastasis-directed, rather than SBRT not feasible, (3) any contraindication to receive systemic therapy (such as comorbidities), (4) all the histologies were included, (5) available signed informed consent form for treatment. Tumor response and toxicity were evaluated using the response evaluation criteria in solid tumors and the Common Terminology Criteria for Adverse Events version 4.03, respectively. Progression-free survival in-field and out-field (in-field and out-field PFS) and overall survival (OS) were calculated via the Kaplan–Meier method. The drug treatment-free interval was calculated from the start of SBRT to the beginning of any systemic therapy.
Results
From 2010 to December 2018, 61 patients with extracranial and intracranial metastatic RCC underwent SBRT on 83 lesions. Intracranial and extracranial lesions were included. Forty-five (74%) patients were treated for a solitary metastatic lesion. Median RT dose was 25 Gy (range 10–52) in 5–10 fractions. With a median follow-up of 2.3 years (range 0–7.15), 1-year in-field PFS was 70%, 2-year in-field PFS was 55%. One year out-field PFS was 39% and 1-year OS was 78%. Concomitant systemic therapy was employed for only 11 (18%) patients, for the others 50 (82%) the drug treatment-free rate was 70% and 50% at 1 and 2 years, respectively. No > G1 acute and late toxicities were reported.
Conclusion
The pattern of failure was pre-dominantly out-of-field, even if the population was negatively selected and the used RT dose could be considered palliative. Therefore, SBRT appears to be a well-tolerated, feasible and safe approach in oligo metastatic RCC patients with an excellent in-field PFS. SBRT might play a role in the management of selected RCC patients allowing for a delay systemic therapy begin (one out of two patients were free from new systemic therapy at 2 years after SBRT). Further research on SBRT dose escalation is warranted.
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Abbreviations
- BED:
-
Biologically effective dose
- BM:
-
Brain metastasis
- CI:
-
Confidence interval
- CR:
-
Complete response
- CT:
-
Computed tomography
- CTV:
-
Clinical target volume
- CTCAE:
-
Common terminology criteria for adverse events
- EQD2:
-
EQuivalent dose in 2 Gy fractions
- ESMO:
-
European Society for Medical Oncology
- GTV:
-
Gross tumor volume
- HR:
-
Hazard ratio
- IEO:
-
European Institute of Oncology IRCCS
- LCR:
-
Local control rate
- mRCC:
-
Metastatic renal cell carcinoma
- OAR:
-
Organ at risk
- OS:
-
Overall survival
- PD:
-
Progression of disease
- PFS:
-
Progression-free survival
- PET:
-
Positron emission tomography
- PR:
-
Partial response
- PTV:
-
Planning target volume
- RCC:
-
Renal cell carcinoma
- RECIST:
-
Response evaluation criteria in solid tumors
- RT:
-
Radiotherapy
- SBRT:
-
Stereotactic body radiation therapy
- SD:
-
Stable disease
- SFI:
-
Systemic treatment-free interval
- TKI:
-
Tyrosine kinase inhibitor
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Acknowledgements
This work was partially supported by the Italian Ministry of Health with Ricerca Corrente and 5×1000 funds. MZ was supported by a research grant from Accuray Inc. entitled “Data collection and analysis of Tomotherapy and CyberKnife breast clinical studies, breast physics studies and prostate study”. MA and FLF were partially supported by a research grant from the Associazione Italiana per la Ricerca sul Cancro (AIRC) entitled "Radioablation ± hormonotherapy for prostate cancer oligorecurrences (RADIOSA trial): potential of imaging and biology" registered at ClinicalTrials.gov NCT03940235, approved by the Ethics Committee of IRCCS Istituto Europeo di Oncologia and Centro Cardiologico Monzino (IEO-997).The sponsors did not play any role in the study design, collection, analysis and interpretation of data, nor in the writing of the manuscript, nor in the decision to submit the manuscript for publication.
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Marvaso, G., Corrao, G., Oneta, O. et al. Oligo metastatic renal cell carcinoma: stereotactic body radiation therapy, if, when and how?. Clin Transl Oncol 23, 1717–1726 (2021). https://doi.org/10.1007/s12094-021-02574-0
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DOI: https://doi.org/10.1007/s12094-021-02574-0