Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

185 questions · 188 findings · 18 reviews · Headline outcomes only

No studies found 35 · 18.6%GRADE not reported 3 · 1.6%Very low 27 · 14.4%Low 63 · 33.5%Moderate 43 · 22.9%High 17 · 9%

Intervention not reported

Treatment discontinuation due to adverse event (safety population) · women with metastatic triple‐negative breast cancer (mTNBC)

The intervention probably leads to lower treatment discontinuation due to adverse event (safety population) (moderate certainty).

1 finding from 1 review

Intervention not reported

Treatment‐related death (safety population) · women with metastatic triple‐negative breast cancer (mTNBC)

The intervention may leads to higher treatment‐related death (safety population) (low certainty).

1 finding from 1 review

Intervention not reported

Nausea/vomiting* grade 3 or 4 (safety population) · women with metastatic triple‐negative breast cancer (mTNBC)

The intervention may leads to higher nausea/vomiting* grade 3 or 4 (safety population) (low certainty).

1 finding from 1 review

Intervention not reported

Anaemia grade 3 or 4 (safety population) · women with metastatic triple‐negative breast cancer (mTNBC)

The intervention may leads to higher anaemia grade 3 or 4 (safety population) (low certainty).

1 finding from 1 review

Intervention not reported

Leukopaenia (safety population) · women with metastatic triple‐negative breast cancer (mTNBC)

The intervention probably leads to higher leukopaenia (safety population) (moderate certainty).

1 finding from 1 review

Pembrolizumab vs chemotherapy alone

Brain tumour response rates: complete response (CR) and partial response (PR) combinedNo. of participants: 847(6 RCTs)

Pembrolizumab probably leads to higher response rate (partial and complete response) compared with chemotherapy (moderate certainty).

1 finding from 1 review

Intervention not reported

Overall survival ‐ trials of metastatic breast cancer participants unselected for TNBC · women with metastatic breast cancer unselected for triple‐negative breast cancer (TNBC)

The intervention showed no clear difference in overall survival ‐ trials of metastatic breast cancer participants… (high certainty).

1 finding from 1 review

Intervention not reported

Leukopenia** grade 3 or 4 (safety population) · women with metastatic breast cancer

The intervention probably leads to higher leukopenia** grade 3 or 4 (safety population) (moderate certainty).

1 finding from 1 review

Intervention not reported

Progression‐free survival/time to progression (randomised participants) ‐ trials of metastatic breast cancer participants unselected for TNBC · women with metastatic breast cancer unselected for triple‐negative breast cancer (TNBC)

The intervention showed no clear difference in progression‐free survival/time to progression (randomised… (moderate certainty).

1 finding from 1 review

Intervention not reported

Objective tumour response rate (assessable participants) ‐ trials of metastatic breast cancer participants unselected for TNBC · women with metastatic breast cancer unselected for triple‐negative breast cancer (TNBC)

The intervention may leads to higher objective tumour response rate (assessable participants) ‐ trials of… (low certainty).

1 finding from 1 review

Intervention not reported

Overall survival ‐ trials of mTNBC participants · women with metastatic triple‐negative breast cancer (mTNBC)

The intervention showed no clear difference in overall survival ‐ trials of mTNBC participants (low certainty).

1 finding from 1 review

Intervention not reported

Progression‐free survival/time to progression (randomised participants) ‐ trials of mTNBC participants · women with metastatic triple‐negative breast cancer (mTNBC)

The intervention may leads to lower progression‐free survival/time to progression (randomised… (low certainty).

1 finding from 1 review

Intervention not reported

Objective tumour response rate (assessable participants) ‐ trials of mTNBC participants · women with metastatic triple‐negative breast cancer (mTNBC)

The intervention may leads to higher objective tumour response rate (assessable participants) ‐ trials of… (low certainty).

1 finding from 1 review