Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

3,018 questions · 3,100 findings · 369 reviews · Headline outcomes only

No studies found 774 · 25%GRADE not reported 108 · 3.5%Very low 727 · 23.5%Low 840 · 27.1%Moderate 474 · 15.3%High 177 · 5.7%

Chemotherapy vs chemotherapy alone

Overall survival (taxane‐containing doublet therapy vs taxane monotherapy) · advanced gastric adenocarcinoma

Chemotherapy showed no clear difference in overall survival (taxane‐containing doublet therapy vs taxane… compared with chemotherapy (low certainty).

1 finding from 1 review

Chemotherapy vs chemotherapy alone

Progression‐free survival (PSF) · advanced gastric adenocarcinoma

Chemotherapy showed no clear difference in progression‐free survival (non‐taxane monotherapy vs taxane… compared with chemotherapy (low certainty).

3 findings from 1 review

Chemotherapy vs placebo, best supportive care (BSC) or no treatment

Serious adverse events · advanced gastric and oesophago‐gastric junction adenocarcinoma

Chemotherapy probably leads to higher serious adverse events compared with placebo, best supportive care (BSC) or no treatment (moderate certainty).

1 finding from 1 review

Chemotherapy vs chemotherapy alone

Tumour response · advanced gastric adenocarcinoma

Chemotherapy showed no clear difference in tumour response rate (non‐taxane monotherapy vs taxane monotherapy) compared with chemotherapy (low certainty).

2 findings from 1 review

Chemotherapy vs chemotherapy alone

Tumour response rate (taxane‐containing doublet therapy vs taxane monotherapy) · advanced gastric adenocarcinoma

It is very uncertain whether chemotherapy changes tumour response rate (taxane‐containing doublet therapy vs taxane… compared with chemotherapy (very low certainty).

1 finding from 1 review

Chemotherapy vs placebo, best supportive care (BSC) or no treatment

Tumour response · advanced gastric and oesophago‐gastric junction adenocarcinoma

Chemotherapy showed no clear difference in tumour response rate compared with placebo, best supportive care (BSC) or no treatment (low certainty).

1 finding from 1 review

Chemotherapy vs placebo, best supportive care (BSC) or no treatment

Any adverse events · advanced gastric and oesophago‐gastric junction adenocarcinoma

Chemotherapy showed no clear difference in any adverse events compared with placebo, best supportive care (BSC) or no treatment (high certainty).

1 finding from 1 review

Biological therapy vs placebo, best supportive care (BSC) or no treatment

Progression‐free survival · advanced gastric and oesophago‐gastric junction adenocarcinoma

Biological therapy probably leads to lower progression‐free survival compared with placebo, best supportive care (BSC) or no treatment (moderate certainty).

1 finding from 1 review

Biological therapy vs placebo, best supportive care (BSC) or no treatment

Serious adverse events · advanced gastric and oesophago‐gastric junction adenocarcinoma

Biological therapy showed no clear difference in serious adverse events compared with placebo, best supportive care (BSC) or no treatment (low certainty).

1 finding from 1 review

Biological therapy vs placebo, best supportive care (BSC) or no treatment

Tumour response · advanced gastric and oesophago‐gastric junction adenocarcinoma

Biological therapy may leads to higher tumour response rate compared with placebo, best supportive care (BSC) or no treatment (low certainty).

1 finding from 1 review