Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,345 questions · 4,525 findings · 483 reviews

No studies found 1,024 · 22.6%GRADE not reported 388 · 8.6%Very low 1,172 · 25.9%Low 1,227 · 27.1%Moderate 576 · 12.7%High 138 · 3%

Combination chemotherapy vs single‐agent chemotherapy

Overall survival (3 years) · people with resectable stage II and III rectal cancer undergoing preoperative chemoradiation followed by surgery

It is very uncertain whether combination chemotherapy changes overall survival (3 years) compared with single‐agent chemotherapy (very low certainty).

1 finding from 1 review

Combination chemotherapy vs single‐agent chemotherapy

Disease-free survival · people with resectable stage II and III rectal cancer undergoing preoperative chemoradiation followed by surgery

It is very uncertain whether combination chemotherapy changes disease‐free survival (3 years) compared with single‐agent chemotherapy (very low certainty).

1 finding from 1 review

Combination chemotherapy vs single‐agent chemotherapy

Complete response rate after preoperative chemoradiation (ypCR) · people with resectable stage II and III rectal cancer undergoing preoperative chemoradiation followed by surgery

Combination chemotherapy leads to higher complete response rate after preoperative chemoradiation (ypCR) compared with single‐agent chemotherapy (high certainty).

1 finding from 1 review

Combination chemotherapy vs single‐agent chemotherapy

Toxicity ‐ early adverse events G3/4 · people with resectable stage II and III rectal cancer undergoing preoperative chemoradiation followed by surgery

Combination chemotherapy probably leads to higher toxicity ‐ early adverse events G3/4 compared with single‐agent chemotherapy (moderate certainty).

1 finding from 1 review

Combination chemotherapy vs single‐agent chemotherapy

Metastases intra‐abdominal · people with resectable stage II and III rectal cancer undergoing preoperative chemoradiation followed by surgery

Combination chemotherapy showed no clear difference in metastases intra‐abdominal compared with single‐agent chemotherapy (moderate certainty).

1 finding from 1 review

Combination chemotherapy vs single‐agent chemotherapy

Radiotherapy compliance · people with resectable stage II and III rectal cancer undergoing preoperative chemoradiation followed by surgery

Combination chemotherapy probably leads to lower radiotherapy compliance compared with single‐agent chemotherapy (moderate certainty).

1 finding from 1 review

Combination chemotherapy vs single‐agent chemotherapy

Chemotherapy compliance · people with resectable stage II and III rectal cancer undergoing preoperative chemoradiation followed by surgery

Combination chemotherapy leads to lower chemotherapy compliance compared with single‐agent chemotherapy (high certainty).

1 finding from 1 review

Intervention not reported

Mortality within the longest · surgical patients with need for abdominal, caesarean section, orthopaedic or breast surgery

The intervention showed no clear difference in mortality within the longest (low certainty).

1 finding from 1 review

Intervention not reported

Mortality within the longest · surgical patients with need for abdominal, caesarean section, orthopaedic or breast surgery

It is very uncertain whether the intervention changes mortality within the longest (very low certainty).

1 finding from 1 review

Intervention not reported

Surgical site infection within 30 days in trials with low risk of bias (14 days to 30 days) · surgical patients with need for abdominal, caesarean section, orthopaedic or breast surgery

The intervention showed no clear difference in surgical site infection within 30 days in trials with low risk of… (low certainty).

1 finding from 1 review

Intervention not reported

Surgical site infection within 30 days, irrespective of risk of bias (14 days to 30 days) · surgical patients with need for abdominal, caesarean section, orthopaedic or breast surgery

The intervention showed no clear difference in surgical site infection within 30 days, irrespective of risk of bias… (low certainty).

1 finding from 1 review

Intervention not reported

Respiratory insufficiency · surgical patients with need for abdominal, caesarean section, orthopaedic or breast surgery

The intervention showed no clear difference in respiratory insufficiency (moderate certainty).

1 finding from 1 review

Tramadol vs placebo

Additional analgesia required (escape analgesia) · children undergoing surgery

Tramadol may leads to lower number of patients requiring rescue analgesia (PACU) compared with placebo (low certainty).

1 finding from 1 review