Gap finder

Search review questions

Each row is one question a systematic review asked: who, what, compared with what, and which outcome, with the effect it found and how certain that is. Words match anywhere in the field.

Limit to evidence status or GRADE (optional)

1,590 questions in 129 reviews · Gynaecological, Neuro-oncology and Orphan Cancer

current versions
No studies 281 · 17.7%Ungraded 74 · 4.7%Very low 410 · 25.8%Low 420 · 26.4%Moderate 280 · 17.6%High 125 · 7.9%

Ungraded means an effect was reported without a GRADE rating; it is not a gap. No studies means the review found nothing to answer the question. The six categories are a display order, not a score.

QuestionEffectEvidenceStatus / GRADE
Music intervention plus standard care vs standard care alone
Depression · pediatric cancer patients (< 18 years)
Music interventions for improving psychological and physical outcomes in people with cancer (2021) · Cochrane
no estimate extracted0 studies · 0 participantsUngraded
Bethanechol vs placebo
Rate of spontaneous voiding recovery 1 week after surgery
Postoperative interventions for preventing bladder dysfunction after radical hysterectomy in women with… (2021) · Cochrane
no estimate extractedNRNo studies
Suprapubic catheterisation vs intermittent self‐catheterisation
Time after surgery to post‐void residual volume of urine ≤ 50 mL (days)
Postoperative interventions for preventing bladder dysfunction after radical hysterectomy in women with… (2021) · Cochrane
no estimate extractedNRNo studies
Suprapubic catheterisation vs intermittent self‐catheterisation
Adverse events (acute complication after surgery)
Postoperative interventions for preventing bladder dysfunction after radical hysterectomy in women with… (2021) · Cochrane
RR 0.77 [0.24, 2.49]1 study · 71 participantsVery low
Suprapubic catheterisation vs intermittent self‐catheterisation
Post‐void residual urine volume (mL) at 1 month after surgery
Postoperative interventions for preventing bladder dysfunction after radical hysterectomy in women with… (2021) · Cochrane
no estimate extractedNRNo studies
Suprapubic catheterisation vs intermittent self‐catheterisation
Urinary tract infections in the first month after surgery
Postoperative interventions for preventing bladder dysfunction after radical hysterectomy in women with… (2021) · Cochrane
RR 0.77 [0.53, 1.13]2 studies · 95 participantsVery low
Suprapubic catheterisation vs intermittent self‐catheterisation
Subjective urinary symptoms
Postoperative interventions for preventing bladder dysfunction after radical hysterectomy in women with… (2021) · Cochrane
no estimate extractedNRNo studies
Bethanechol vs placebo
Quality of life (QoL)
Postoperative interventions for preventing bladder dysfunction after radical hysterectomy in women with… (2021) · Cochrane
no estimate extractedNRNo studies
Bethanechol vs placebo
Time after surgery to post‐void residual volume of urine ≤ 50 mL (days)
Postoperative interventions for preventing bladder dysfunction after radical hysterectomy in women with… (2021) · Cochrane
no estimate extractedNRNo studies
Bethanechol vs placebo
Adverse events
Postoperative interventions for preventing bladder dysfunction after radical hysterectomy in women with… (2021) · Cochrane
no estimate extractedNRNo studies
Bethanechol vs placebo
Post‐void residual urine volume (mL) at 1 month after surgery
Postoperative interventions for preventing bladder dysfunction after radical hysterectomy in women with… (2021) · Cochrane
no estimate extracted1 study · 39 participantsVery low
Bethanechol vs placebo
Urinary tract infections in the first month after surgery
Postoperative interventions for preventing bladder dysfunction after radical hysterectomy in women with… (2021) · Cochrane
no estimate extractedNRNo studies
Bethanechol vs placebo
Subjective urinary symptoms
Postoperative interventions for preventing bladder dysfunction after radical hysterectomy in women with… (2021) · Cochrane
no estimate extractedNRNo studies
Suprapubic catheterisation vs intermittent self‐catheterisation
Rate of spontaneous voiding recovery 1 week after surgery
Postoperative interventions for preventing bladder dysfunction after radical hysterectomy in women with… (2021) · Cochrane
no estimate extractedNRNo studies
Suprapubic catheterisation vs intermittent self‐catheterisation
Quality of life (QoL)
Postoperative interventions for preventing bladder dysfunction after radical hysterectomy in women with… (2021) · Cochrane
no estimate extractedNRNo studies
Protons vs photons
Local control ( · adults with chordoma
Protons versus photons for the treatment of chordoma (2021) · Cochrane
HR 5.34 [0.66, 43.43]39 participantsVery low
Protons vs photons
Mortality ( · adults with chordoma
Protons versus photons for the treatment of chordoma (2021) · Cochrane
HR 0.44 [0.13, 1.57]65 participantsVery low
Protons vs photons
Recurrence ( · adults with chordoma
Protons versus photons for the treatment of chordoma (2021) · Cochrane
HR 0.34 [0.1, 1.17]81 participantsVery low
Protons vs photons
Treatment‐related toxicity · adults with chordoma
Protons versus photons for the treatment of chordoma (2021) · Cochrane
RR 1.28 [0.17, 9.86]1 study · 33 participantsVery low
Intervention NR
MSP compared with IHC · people with glioblastoma undergoing treatment with temozolomide Outcome being predicted: overall survival (time to…
Prognostic value of test(s) for O6‐methylguanine–DNA methyltransferase (MGMT) promoter methylation for… (2021) · Cochrane
no estimate extracted7 studies · 913 participantsModerate
Intervention NR
Other techniques (against MSP or PSQ) · people with glioblastoma undergoing treatment with temozolomide Outcome being predicted: overall survival (time to…
Prognostic value of test(s) for O6‐methylguanine–DNA methyltransferase (MGMT) promoter methylation for… (2021) · Cochrane
no estimate extracted7 studies · 1209 participantsVery low
Intervention NR
PSQ compared with IHC · people with glioblastoma undergoing treatment with temozolomide Outcome being predicted: overall survival (time to…
Prognostic value of test(s) for O6‐methylguanine–DNA methyltransferase (MGMT) promoter methylation for… (2021) · Cochrane
no estimate extracted5 studies · 871 participantsLow
Intervention NR
PSQ compared with MSP · people with glioblastoma undergoing treatment with temozolomide Outcome being predicted: overall survival (time to…
Prognostic value of test(s) for O6‐methylguanine–DNA methyltransferase (MGMT) promoter methylation for… (2021) · Cochrane
no estimate extracted9 studies · 1119 participantsLow
Intervention NR
Variants of PSQ · people with glioblastoma undergoing treatment with temozolomide Outcome being predicted: overall survival (time to…
Prognostic value of test(s) for O6‐methylguanine–DNA methyltransferase (MGMT) promoter methylation for… (2021) · Cochrane
no estimate extracted11 studies · 876 participantsVery low
Intervention NR
qMSP (against MSP or PSQ) · people with glioblastoma undergoing treatment with temozolomide Outcome being predicted: overall survival (time to…
Prognostic value of test(s) for O6‐methylguanine–DNA methyltransferase (MGMT) promoter methylation for… (2021) · Cochrane
no estimate extracted7 studies · 765 participantsVery low
Intervention NR
Bead array (against MSP or PSQ) · people with glioblastoma undergoing treatment with temozolomide Outcome being predicted: overall survival (time to…
Prognostic value of test(s) for O6‐methylguanine–DNA methyltransferase (MGMT) promoter methylation for… (2021) · Cochrane
no estimate extracted2 studies · 81 participantsVery low
Intervention NR
PCR‐mRNA (against MSP or PSQ) · people with glioblastoma undergoing treatment with temozolomide Outcome being predicted: overall survival (time to…
Prognostic value of test(s) for O6‐methylguanine–DNA methyltransferase (MGMT) promoter methylation for… (2021) · Cochrane
no estimate extracted2 studies · 148 participantsVery low
Intervention NR
MS‐MLPA (against MSP or PSQ) · people with glioblastoma undergoing treatment with temozolomide Outcome being predicted: overall survival (time to…
Prognostic value of test(s) for O6‐methylguanine–DNA methyltransferase (MGMT) promoter methylation for… (2021) · Cochrane
no estimate extracted1 study · 48 participantsVery low
Intervention NR
PCR‐HRM (against MSP or PSQ) · people with glioblastoma undergoing treatment with temozolomide Outcome being predicted: overall survival (time to…
Prognostic value of test(s) for O6‐methylguanine–DNA methyltransferase (MGMT) promoter methylation for… (2021) · Cochrane
no estimate extracted3 studies · 309 participantsVery low
Bevacizumab plus chemotherapy vs chemotherapy
Overall survival · women with persistent, recurrent, or metastatic cervical cancer
Vascular endothelial growth factor (VEGF) targeting therapy for persistent, recurrent, or metastatic… (2021) · Cochrane
HR 0.77 [0.62, 0.95]1 study · 452 participantsLow
Cediranib plus chemotherapy vs placebo plus chemotherapy
Specific adverse events: serious haemorrhage · women with persistent, recurrent, or metastatic cervical cancer
Vascular endothelial growth factor (VEGF) targeting therapy for persistent, recurrent, or metastatic… (2021) · Cochrane
RR 5.45 [0.27, 109.49]1 study · 67 participantsVery low
Cediranib plus chemotherapy vs placebo plus chemotherapy
Specific adverse events: serious thromboembolic events · women with persistent, recurrent, or metastatic cervical cancer
Vascular endothelial growth factor (VEGF) targeting therapy for persistent, recurrent, or metastatic… (2021) · Cochrane
RR 3.41 [0.14, 80.59]1 study · 60 participantsVery low
Cediranib plus chemotherapy vs placebo plus chemotherapy
Specific adverse events: serioushypertension · women with persistent, recurrent, or metastatic cervical cancer
Vascular endothelial growth factor (VEGF) targeting therapy for persistent, recurrent, or metastatic… (2021) · Cochrane
RR 0.36 [0.02, 8.62]1 study · 67 participantsVery low
Cediranib plus chemotherapy vs placebo plus chemotherapy
Serious adverse events · women with persistent, recurrent, or metastatic cervical cancer
Vascular endothelial growth factor (VEGF) targeting therapy for persistent, recurrent, or metastatic… (2021) · Cochrane
RR 1.15 [0.75, 1.78]1 study · 67 participantsLow
Cediranib plus chemotherapy vs placebo plus chemotherapy
Economic evaluation ‐ not measured · women with persistent, recurrent, or metastatic cervical cancer
Vascular endothelial growth factor (VEGF) targeting therapy for persistent, recurrent, or metastatic… (2021) · Cochrane
no estimate extractedNRNo studies
Apatinib plus chemotherapy or chemotherapy/brachytherapy vs chemotherapy or chemotherapy/brachytherapy
Overall survival · women with recurrent or FIGO stage IVB cervical cancer
Vascular endothelial growth factor (VEGF) targeting therapy for persistent, recurrent, or metastatic… (2021) · Cochrane
HR 0.9 [0.51, 1.6]1 study · 52 participantsLow
Apatinib plus chemotherapy or chemotherapy/brachytherapy vs chemotherapy or chemotherapy/brachytherapy
Specific adverse events: gastrointestinal perforations or fistulae ‐ not reported · women with recurrent or FIGO stage IVB cervical cancer
Vascular endothelial growth factor (VEGF) targeting therapy for persistent, recurrent, or metastatic… (2021) · Cochrane
no estimate extractedNRNo studies
Apatinib plus chemotherapy or chemotherapy/brachytherapy vs chemotherapy or chemotherapy/brachytherapy
Specific adverse events: haemorrhage ‐ not reported · women with recurrent or FIGO stage IVB cervical cancer
Vascular endothelial growth factor (VEGF) targeting therapy for persistent, recurrent, or metastatic… (2021) · Cochrane
no estimate extractedNRNo studies
Apatinib plus chemotherapy or chemotherapy/brachytherapy vs chemotherapy or chemotherapy/brachytherapy
Specific adverse events: thromboembolic events ‐ not reported · women with recurrent or FIGO stage IVB cervical cancer
Vascular endothelial growth factor (VEGF) targeting therapy for persistent, recurrent, or metastatic… (2021) · Cochrane
no estimate extractedNRNo studies
Apatinib plus chemotherapy or chemotherapy/brachytherapy vs chemotherapy or chemotherapy/brachytherapy
Specific adverse events: hypertension · women with recurrent or FIGO stage IVB cervical cancer
Vascular endothelial growth factor (VEGF) targeting therapy for persistent, recurrent, or metastatic… (2021) · Cochrane
RR 5.14 [1.28, 20.73]1 study · 52 participantsLow
Bevacizumab plus chemotherapy vs chemotherapy
Specificadverse events: gastrointestinal perforations or fistulae · women with persistent, recurrent, or metastatic cervical cancer
Vascular endothelial growth factor (VEGF) targeting therapy for persistent, recurrent, or metastatic… (2021) · Cochrane
RR 18 [2.42, 133.67]1 study · 440 participantsModerate
Apatinib plus chemotherapy or chemotherapy/brachytherapy vs chemotherapy or chemotherapy/brachytherapy
Serious adverse events ‐ not reported · women with recurrent or FIGO stage IVB cervical cancer
Vascular endothelial growth factor (VEGF) targeting therapy for persistent, recurrent, or metastatic… (2021) · Cochrane
no estimate extractedNRNo studies
Apatinib plus chemotherapy or chemotherapy/brachytherapy vs chemotherapy or chemotherapy/brachytherapy
Economic evaluation ‐ not measured · women with recurrent or FIGO stage IVB cervical cancer
Vascular endothelial growth factor (VEGF) targeting therapy for persistent, recurrent, or metastatic… (2021) · Cochrane
no estimate extractedNRNo studies
Pazopanib plus lapatinib vs lapatinib
Overall survival · women with persistent, recurrent, or metastatic cervical cancer
Vascular endothelial growth factor (VEGF) targeting therapy for persistent, recurrent, or metastatic… (2021) · Cochrane
HR 2.71 [1.16, 6.31]1 study · 117 participantsLow
Pazopanib plus lapatinib vs lapatinib
Specific adverse events: gastrointestinal perforations or fistulae · women with persistent, recurrent, or metastatic cervical cancer
Vascular endothelial growth factor (VEGF) targeting therapy for persistent, recurrent, or metastatic… (2021) · Cochrane
RR 2 [0.19, 21.59]1 study · 152 participantsVery low
Pazopanib plus lapatinib vs lapatinib
Specific adverse events: haemorrhage · women with persistent, recurrent, or metastatic cervical cancer
Vascular endothelial growth factor (VEGF) targeting therapy for persistent, recurrent, or metastatic… (2021) · Cochrane
RR 2 [0.72, 5.58]1 study · 152 participantsVery low
Pazopanib plus lapatinib vs lapatinib
Specific adverse events: thromboembolic events · women with persistent, recurrent, or metastatic cervical cancer
Vascular endothelial growth factor (VEGF) targeting therapy for persistent, recurrent, or metastatic… (2021) · Cochrane
RR 3 [0.12, 72.5]1 study · 152 participantsVery low
Pazopanib plus lapatinib vs lapatinib
Specific adverse events: hypertension · women with persistent, recurrent, or metastatic cervical cancer
Vascular endothelial growth factor (VEGF) targeting therapy for persistent, recurrent, or metastatic… (2021) · Cochrane
RR 12 [2.94, 49.01]1 study · 152 participantsModerate
Pazopanib plus lapatinib vs lapatinib
Serious adverse events · women with persistent, recurrent, or metastatic cervical cancer
Vascular endothelial growth factor (VEGF) targeting therapy for persistent, recurrent, or metastatic… (2021) · Cochrane
RR 1.45 [0.94, 2.26]1 study · 152 participantsLow
Pazopanib plus lapatinib vs lapatinib
Economic evaluation ‐ not measured · women with persistent, recurrent, or metastatic cervical cancer
Vascular endothelial growth factor (VEGF) targeting therapy for persistent, recurrent, or metastatic… (2021) · Cochrane
no estimate extractedNRNo studies