Review for 10.1186/s12876-018-0861-4 (2018)

Reviewer ’s report  
Title: Title of Article: Synchronous polypectomy during endoscopic  diagnosis of colorectal 
cancer - Is the risk of tumour implantation at the polypectomy site significant?  
 
Version: 1 Date: 13 Jun 2018  
 
Reviewer: Norikatsu Miyoshi  
 
Reviewer's report:  
The authors think synchronous polypectomy in colonic malignancies has some problem to be 
discussed because of perceiving the risk of tumor implantation at the polypectomy site. They 
tried to analysis the risk after synchronous polypectomy . However, they just evaluated the 
patients with CRC and polyp(s) that were resected. It does not proof the tumor implantation after 
the polypectomy. The recurrence must be identified as the tumor recurred by genomic analysis or 
some equivalent.  
 
Also, the  paper should be reviewed by English editing because the grammar looks poor.  
 
Are the methods appropriate and well described?  
If not, please specify what is required in your comments to the authors.  
No 
Does the work include the necessary controls?  
If not, please specify which controls are required in your comments to the authors.  
No 
Are the conclusions drawn adequately supporte d by the data shown?  
If not, please explain in your comments to the authors.  
No 
  
Are you able to assess any statistics in the manus cript or would you recommend an 
additional statistical review?  
If an additional statistical review is recommended, please spe cify what aspects require further 
assessment in your comments to the editors.  
I recommend additional statistical review  
Quality of written English  
Please indicate the quality of language in the manuscript:  
Not suitable for publication unless extensively edited  
Declaration of competing interests  
Please complete a declaration of competing interests, considering the following questions:  
1. Have you in the past five years received reimbursements, fees, funding, or salary from an  
organisation that may in any way gain or  lose financial ly from the publication of this 
manuscript, either now or in the future?  
2. Do you hold any stocks or shares in an organisation t hat may in any way gain or lose 
financially from the publication of this manuscript, either now or in the future ? 
3. Do you hold or are you currently applying for any patents  relating to the content of the 
manuscript?  
4. Have you received reimbursements, fees, funding, or salary from an organization that 
holds or has applied for patents relating to the content of the manuscript?  
5. Do you have any other financial competing interests?  
6. Do you have any non -financial competing interests in relation to this paper?  
If you can answer no to all of the above, write 'I declare that I have no competing interests' 
below. If your reply is yes to any, please give details below.  
 
n/a 
 
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I agree to the open peer review policy of the journal