Review for 10.1186/s12876-021-01816-3 (2021)

Reviewer’s report
Title: 
Clinical outcomes of doxorubicin-eluting CalliSpheres® beads-
transarterial chemoembolization for unresectable or recurrent esophageal
carcinoma
Version: 
0 
Date: 
16 Jan 2021
Reviewer: 
Rasa Zarnegar
Reviewer's report:
This is an interesting study. I think the technique maybe worth describing
further. In the study you state the success rate at 100%. in the manuscript you
should mention potential pitfalls and how common this is typically. 
The authors should have a control group for comparison. This is really required
and will show if the new approach overall had improved outcomes. Otherwise
this needs to be relabeled a feasibility study and worded as such. 
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Is the study design appropriate to answer the research question (including the use
of appropriate controls), and are the conclusions supported by the evidence
presented?
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