Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

19 questions · 19 findings · 4 reviews · Colorectal · Headline outcomes only

No studies found 0 · 0%GRADE not reported 0 · 0%Very low 4 · 21.1%Low 7 · 36.8%Moderate 6 · 31.6%High 2 · 10.5%

Single layer gastrointestinal anastomosis vs Double layer gastrointestinal anastomosis

Anastomotic leak · patients with Bowel resection

It is very uncertain whether single layer gastrointestinal anastomosis changes anastomotic leak Odds ratio compared with double layer gastrointestinal anastomosis (very low certainty).

1 finding from 1 review

Single layer gastrointestinal anastomosis vs Double layer gastrointestinal anastomosis

Major complications · patients with Bowel resection

Single layer gastrointestinal anastomosis showed no clear difference in major complications Odds ratio compared with double layer gastrointestinal anastomosis (low certainty).

1 finding from 1 review

Single layer gastrointestinal anastomosis vs Double layer gastrointestinal anastomosis

Anastomotic leak in high quality trials Odds ratio · patients with Bowel resection

Single layer gastrointestinal anastomosis showed no clear difference in anastomotic leak in high quality trials Odds ratio compared with double layer gastrointestinal anastomosis (moderate certainty).

1 finding from 1 review

Single layer gastrointestinal anastomosis vs Double layer gastrointestinal anastomosis

Anastomotic leak in poor quality trials Odds ratio · patients with Bowel resection

It is very uncertain whether single layer gastrointestinal anastomosis changes anastomotic leak in poor quality trials Odds ratio compared with double layer gastrointestinal anastomosis (very low certainty).

1 finding from 1 review

Chromoscopy vs conventional colonoscopy

Number of participants with 3 or more adenomas (in studies with single intubation) · people undergoing colonoscopy for the detection of polyps

Chromoscopy may leads to higher number of participants with 3 or more adenomas (in studies with… compared with conventional colonoscopy (low certainty).

1 finding from 1 review

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

IRI with fluoropyrimidines vs single agent IRI

Progression‐free survival (PSF) · patients with advanced and/or metastatic colorectal cancer

IRI with fluoropyrimidines probably leads to lower progression‐free survival (Disease progression) compared with single agent IRI (moderate certainty).

1 finding from 1 review