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 placebo, best supportive care (BSC) or no treatment

Overall survival · advanced gastric and oesophago‐gastric junction adenocarcinoma

Chemotherapy probably leads to lower overall 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

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

Biological therapy 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

Chemmotherapy combined with biological therapy vs chemotherapy alone

Overall survival · advanced gastric and oesophago‐gastric junction adenocarcinoma

Chemmotherapy combined with biological therapy showed no clear difference in overall survival compared with chemotherapy (moderate certainty).

1 finding from 1 review

Chemmotherapy combined with biological therapy vs chemotherapy alone

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

It is very uncertain whether chemmotherapy combined with biological therapy changes progression‐free survival compared with chemotherapy (very low certainty).

1 finding from 1 review

Chemmotherapy combined with biological therapy vs chemotherapy alone

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

It is very uncertain whether chemmotherapy combined with biological therapy changes serious adverse events compared with chemotherapy (very low certainty).

1 finding from 1 review

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

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

Chemotherapy leads to lower progression‐free survival compared with placebo, best supportive care (BSC) or no treatment (high certainty).

1 finding from 1 review

Chemmotherapy combined with biological therapy vs chemotherapy alone

Tumour response · advanced gastric and oesophago‐gastric junction adenocarcinoma

It is very uncertain whether chemmotherapy combined with biological therapy changes tumour response rate compared with chemotherapy (very low certainty).

1 finding from 1 review

Chemmotherapy combined with biological therapy vs chemotherapy alone

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

Chemmotherapy combined with biological therapy showed no clear difference in any adverse events compared with chemotherapy (moderate certainty).

1 finding from 1 review