Reviewer's report
Title:Consumption of Coffee Reduces Risk for Liver Cancer: A Meta-Analysis
Version: 2Date:9 October 2012
Reviewer: Naping Tang
Reviewer's report:
In this study, Sang et al. evaluated the association between coffee consumption
and liver cancer risk with a meta-analysis. Medline, Embase, ISI Web of Science
and Cochrane library were searched for the studies on this topic, and a total of
16 studies with 9 retrospective studies and 7 prospective studies were included
in this meta-analysis. Their data suggested that coffee consumption may be
associated with reduced risk of liver cancer.
The following are the comments on the study:
Major Compulsory Revisions
1. This is an updated meta-analysis of previous two studies (Hepatology.
2007;46:430-5. Gastroenterology. 2007;132:1740-5.), however, the author did
not provide any comments/discussion on these two studies.
2. For study by Tanaka (ref. 22), three different control groups were used, why
this study was only stratified into HCCS?
Minor Essential Revisions
3. The outcomes (liver cancer incidence, liver cancer mortality, etc) of the
prospective studies were different in the included studies. It will be better to
specify the outcomes of the studies included in the meta-analysis.
4. All abbreviations in the table should be expanded under the table, such as
HCCS, CS1, CS2, NCCS in table 3, etc.
5. English writing should be improved.
Level of interest: An article whose findings are important to those with closely
related research interests
Quality of written English: Not suitable for publication unless extensively edited
Statistical review: No, the manuscript does not need to be seen by a
statistician.
Declaration of competing interests:
I declare that I have no competing interests
Reviewer's report
Title:Consumption of Coffee Reduces Risk for Liver Cancer: A Meta-Analysis
Version: 2Date:9 October 2012
Reviewer: Naping Tang
Reviewer's report:
In this study, Sang et al. evaluated the association between coffee consumption
and liver cancer risk with a meta-analysis. Medline, Embase, ISI Web of Science
and Cochrane library were searched for the studies on this topic, and a total of
16 studies with 9 retrospective studies and 7 prospective studies were included
in this meta-analysis. Their data suggested that coffee consumption may be
associated with reduced risk of liver cancer.
The following are the comments on the study:
Major Compulsory Revisions
1. This is an updated meta-analysis of previous two studies (Hepatology.
2007;46:430-5. Gastroenterology. 2007;132:1740-5.), however, the author did
not provide any comments/discussion on these two studies.
2. For study by Tanaka (ref. 22), three different control groups were used, why
this study was only stratified into HCCS?
Minor Essential Revisions
3. The outcomes (liver cancer incidence, liver cancer mortality, etc) of the
prospective studies were different in the included studies. It will be better to
specify the outcomes of the studies included in the meta-analysis.
4. All abbreviations in the table should be expanded under the table, such as
HCCS, CS1, CS2, NCCS in table 3, etc.
5. English writing should be improved.
Level of interest: An article whose findings are important to those with closely
related research interests
Quality of written English: Not suitable for publication unless extensively edited
Statistical review: No, the manuscript does not need to be seen by a
statistician.
Declaration of competing interests:
I declare that I have no competing interests
Please review this paper.
user
Reviewer's report
Title:Consumption of Coffee Reduces Risk for Liver Cancer: A Meta-Analysis
Version: 2Date:9 October 2012
Reviewer: Naping Tang
Reviewer's report:
In this study, Sang et al. evaluated the association between coffee consumption
and liver cancer risk with a meta-analysis. Medline, Embase, ISI Web of Science
and Cochrane library were searched for the studies on this topic, and a total of
16 studies with 9 retrospective studies and 7 prospective studies were included
in this meta-analysis. Their data suggested that coffee consumption may be
associated with reduced risk of liver cancer.
The following are the comments on the study:
Major Compulsory Revisions
1. This is an updated meta-analysis of previous two studies (Hepatology.
2007;46:430-5. Gastroenterology. 2007;132:1740-5.), however, the author did
not provide any comments/discussion on these two studies.
2. For study by Tanaka (ref. 22), three different control groups were used, why
this study was only stratified into HCCS?
Minor Essential Revisions
3. The outcomes (liver cancer incidence, liver cancer mortality, etc) of the
prospective studies were different in the included studies. It will be better to
specify the outcomes of the studies included in the meta-analysis.
4. All abbreviations in the table should be expanded under the table, such as
HCCS, CS1, CS2, NCCS in table 3, etc.
5. English writing should be improved.
Level of interest: An article whose findings are important to those with closely
related research interests
Quality of written English: Not suitable for publication unless extensively edited
Statistical review: No, the manuscript does not need to be seen by a
statistician.
Declaration of competing interests:
I declare that I have no competing interests
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