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Liver metastases from colorectal cancer: propensity score-based comparison of stereotactic body radiation therapy vs. microwave ablation

  • Original Article – Clinical Oncology
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Abstract

Purpose

The study aim was to compare the disease control in two groups of patients affected by liver metastases from CRC treated with microwave ablation (MWA) or stereotactic body radiation therapy (SBRT).

Methods

We extracted data of patients treated between 2009 and 2016. Inclusion criteria were: (1) maximum diameter of the liver lesions less than 4 cm; (2) no more than three liver lesions; (3) no evidence of progressive or untreated gross disease outside the liver; (4) adequate liver function; (5) no concurrent chemotherapy; (6) minimum age of 18. Tumour response was classified according to EORTC-RECIST criteria. Aim of the present study was to evaluate freedom from local progression (FFLP). To reduce indication bias, an inverse probability of treatment weighting was used to estimate treatment effect.

Results

A total of 135 patients with 214 lesions were included in the analysis. Median follow-up time was 24.5 months (range 2.4–95.8). The 1-year freedom from local progression (FFLP) was 88% (95%CI 80–92). In the SBRT group, FFLP was statistically longer than MWA group (p = 0.0214); the 1-year FFLP was 91% (95% CI 81–95) in SBRT group and 84% (95% CI 0.72–0.91) in MWA group. Patients treated with SBRT showed a reduce risk of local relapse compared to MWA (adjusted HR 0.31; 95%CI 0.13–0.70, p = 0.005). As expected, analogous result obtained in the inverse probability weighting analysis (HR 0.38; 95%CI 0.18–0.80; p = 0.011).

Conclusion

In conclusion, there seems to be an advantage of SBRT compared to MWA in treating CRC liver metastases, particularly for lesions bigger than 30 mm

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Correspondence to Ciro Franzese.

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Conflict of interest

The authors declare that they have no conflict of interest.

Human and animal rights statement

For this type of study, formal consent is not required. This article does not contain any studies with animals performed by any of the authors.

Informed consent

Informed consent was obtained from all individual participants included in the study.

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432_2018_2692_MOESM1_ESM.tiff

Figure S1 Freedom from local progression for lesion smaller or equal to 30 mm and according to the treatment (weighted analysis) (TIFF 1941 KB)

432_2018_2692_MOESM2_ESM.tiff

Figure S2 Freedom from local progression for lesion bigger than 30 mm and according to the treatment (weighted analysis) (TIFF 1941 KB)

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Franzese, C., Comito, T., Clerici, E. et al. Liver metastases from colorectal cancer: propensity score-based comparison of stereotactic body radiation therapy vs. microwave ablation. J Cancer Res Clin Oncol 144, 1777–1783 (2018). https://doi.org/10.1007/s00432-018-2692-7

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  • DOI: https://doi.org/10.1007/s00432-018-2692-7

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