Review for 10.1186/s12876-021-01618-7 (2021)

Reviewer’s report
Title: 
Development and validation of a Novel Competing Risk Model for
Predicting Survival of Esophagogastric Junction Adenocarcinoma: a SEER
population-based study and external validation
Version: 
0 
Date: 
24 Apr 2020
Reviewer: 
Xingkang He
Reviewer's report:
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This manuscript proveded us a novel competing risk survival predicting model
for patients with esophagogastric junction adenocarcinoma. Actually, it is not
novel and valuable for clincial practice. Several simliar papers had proposed
serveal models to predict the prognosis of patients after radiation or
esophagectomy. (1,2) Following are some suggestions and questions for the
authors to consider:
1. The authors shoud define included and excluded criteria in more detail inorder
to improve repeatability and 
reproducibility of the study. 
2. Other important therapy-related confounding should be considered, such as
surgical operation, radiation,chemthrapy. If these important factors didn't
considered in the model, the performence and valiadilty will be questioned.
Therefor I don't think that current paper is suitable for publication, major
revision should be made.
Reference 
1. Liu, F., Zhou, R., Jiang, F. et al. Proposal of a Nomogram for Predicting
Survival in Patients with Siewert Type II Adenocarcinoma of the
Esophagogastric Junction After Preoperative Radiation. Ann Surg Oncol 26,
1292-1300 (2019). https://doi.org/10.1245/s10434-019-07237-7
2. Cao, J., Yuan, P., Wang, L. et al. Clinical Nomogram for Predicting Survival
of Esophageal Cancer Patients after Esophagectomy. Sci Rep 6, 26684 (2016).
https://doi.org/10.1038/srep26684
Are the methods appropriate and well described?
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Yes
Does the work include the necessary controls?
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authors.
Unable to assess
Are the conclusions drawn adequately supported by the data shown?
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Yes
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recommend an additional statistical review?
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require further assessment in your comments to the editors.
I am able to assess the statistics
Quality of written English
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Needs some language corrections before being published
Declaration of competing interests
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