Review for 10.1186/s12876-021-01636-5 (2021)

Reviewer’s report
Title: 
A prognostic model for stratification of stage IB/IIA esophageal squamous
cell carcinoma: a retrospective study
Version: 
0 
Date: 
21 Sep 2020
Reviewer's report:
The authors of this paper used the prognostic score including TNM, NLNs and
PD-L1 expression to evaluate the postoperative prognosis of patients with stage
Ib / IIA esophageal squamous cell carcinoma (ESCC). However, there are still
several problems.
1.How to determine the results of immunohistochemistry? Is the author reading
the film or software or machine? If it is the author reading the film, whether
there is subjective judgment, how many people read the film, and whether the
result is credible?
2.Results part of the description is more general, lack of organization, did not
give a detailed description of Figure 3.
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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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