Review for 10.1186/s12876-022-02487-4 (2022)

Reviewer’s report
Title: 
Clinical Characteristics and Outcomes in Those with Primary Extrahepatic
Malignancy and Malignant Ascites
Version: 
0 
Date: 
01 Apr 2022
Reviewer's report:
I am glad to have a chance to review this article.
The content of the report is interesting and seems to be fundamantal part for the
future research. However, 
there ar some concerns to be mentioned.
1. Classification of ascites
Theoritical background for selected cassification is not described clearly. SAAG
is relatively well-known, however may not be common. Cut off value also for TP
and triglyceride should be explained more precisely. 
2. Proposed flow chart described in figure 2
I agree with the concept itself, however it remains some concerns.
It looks like a treatment guide for use of diuretics or ascites drainage.
At present, there is lack of evidence to support the idea and it may be
overrepresenting to describe as a flow chart.
It shoud be described as unestabished proposal in the manuscript, not as a flow
chart.
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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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