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1
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2
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3
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4
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5
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- (J.Austoker, L.Giordano, P.Villain and
- P. Hewitson )
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6
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7
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8
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9
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10
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11
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12
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13
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- For each point of the outline the available scientific evidence, if any,
is reported:
- 1. clinical questions, based
on PICOS drive the literature
search
- 2. the available scientific
literature is summarised and the LEVEL OF EVIDENCE is scored
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14
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- DATA BASES: Embase, Medline,
Cochrane collaboration
- METHOD: Mesh terms if
available,
- free text otherwise
- No language restriction
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15
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- STUDIES: published since 2000
previously published
studies considered, if
relevant, or proposed by
working group
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16
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- SYSTEMATIC REVIEWS: QUOROM
- DIAGNOSTIC ACCURACY: QUADAS
- COHORT / CASE CONTROL:
NEWCASTLE-OTTAWA
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17
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- EVIDENCE TABLE FOR EACH STUDY
- SUMMARY DOCUMENT INCLUDING LEVEL OF EVIDENCE
- DESCRIPTIVE REPORT IF NO CLEAR EVIDENCE
- RECOMMENDATION TO BE DRAWN BY WORKING GROUP
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18
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- P ATIENT
- I NTERVENTION
- C ONDITION
- O UTCOME
- S TUDY DESIGN
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19
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20
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- I: many RCTs or SRs of RCTs
- II: one RCT
- III: prospective cohort studies or SRs of cohort studies
- IV: retrospective case-controls studies or SRs of case controls studies
- V: case series; studies without control group
- VI: expert opinion
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21
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- In presence of
- DISAGREEMENT
- the LEVEL OF EVIDENCE should be DISCUSSED
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22
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23
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- For each sub point of the index:
- starting from clinical questions
based on PICOS (1) the available scientific literature and the LEVEL OF
EVIDENCE (2) are reported
- EVIDENCE BASED RECOMMENDATION and their STRENGHT (3) are formulated by
the working group
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24
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- When scientific literature is not available the working groups should
INTEGRATE the sub points
- APPENDIX:
- PICOS
- SEARCH STRATEGY
- EVIDENCE TABLES
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25
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- A: intervention strongly recommended for all patients
- B: intervention recommended
- C: intervention to be considered but with uncertainty about its impact
- D: intervention not recommended
- E: intervention strongly not recommended
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26
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- This grading doesn’t request a rigid correspondence with the levels of
evidence.
- For example a grade A is given to intervention for which there are
evidence level I (many RCTs or Sr of RCTs) but also to
interventions that can’t be
assessed by RCTs, e.g. psychological aspects, the importance of an
accurate information to the patients, etc).
- A grade B is given to intervention for which there are lower evidence
level (II or III) but also for intervention for which there are level
evidence I but there is uncertainty about the impact of the intervention
in the population or about its practical implementation (e.g. no
resource availability , social barriers , supposed lack of acceptability
by the target population).
- A grade C level is given to intervention for which there are no evidence
and are not considered very
important from other points of view.
- A grade D and E are given to intervention for which there are evidence
of no benefit for the patients or for which the harm outweighs the
benefits.
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27
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28
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29
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30
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- EACH GROUP TRANSLATES THE CHAPTER INDEX INTO SPECIFIC QUESTIONS FOR
LITERATURE SEARCH
- A PRIORITY LEVEL WILL BE ASSIGNED TO EACH QUESTION.
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31
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- IS FOBT SCREENING OFFERED TO GENERAL POPULATION AGED 50 AND OLDER
EFFECTIVE IN REDUCING COLORECTAL CANCER MORTALITY AND OVERALL MORTALITY?
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32
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- P: General population at average risk of colorectal cancer aged 50 years
and older
- I: FOBT screening test; control intervention: no screening
- C: colorectal cancer
- O: colorectal mortality, overall mortality after at least 5 (10) years
of follow up
- S: RCTs, systematic reviews of RCTs
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33
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- Medline: Search date 15th October 2007
- Search Terms:
- (("Colorectal Neoplasms"[Mesh]) AND ("Mass
Screening"[Mesh]) AND ("Occult Blood"[Mesh]))
- Systematic reviews only (no date restriction) – 42 results – most recent
review (Kerr et. al.) and Cochrane review (Hewitson et. al.) selected
for guideline evidence.
- 2007 only – 39 results – no relevant articles published after Kerr et.
al. Systematic review
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- Embase: Search date 15th October 2007
- Search Terms:
- (exp Mass Screening AND exp Large Intestine Tumour AND exp Occult Blood)
AND (systematic review$ OR metaanalys$ OR meta-analys$) – 8 results –
most recent from 2005, i.e. before Kerr et. al. and therefore not
included
- (exp Mass Screening AND exp Large Intestine Tumour AND exp Occult Blood)
limit to yr=“2007”
- 47 results – no relevant articles published after Kerr et. al.
systematic review
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- GUAIAC TEST BIENNIAL INTERVAL
- 4 studies, 329.642 participants:
RR:0.84 (CI95%0.78 -0.90)
- GUAIAC TEST ANNUAL INTERVAL
- 3 studies, 245.764 participants:
RR: 0.85 (CI95% 0.78 – 0.92)
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36
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- GUAIAC TEST ANNUAL AND BIENNIAL INTERVAL
- RR 0.85 (CI95%0.79-0.93)
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- There is good evidence that FOBT screening using the Guaiac test
reduces mortality for colorectal cancer of invited participants by 16%.
The reduction in colorectal cancer mortality has no impact on overall
mortality because colorectal cancer is a disease which causes only a
small proportion of the overall mortality. (LEVEL OF EVIDENCE I)
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38
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- 1. Which are patient-related criteria for postponing polypectomy in
patients undergoing CRC screening
- primary FS screening
- b) colonoscopic assessment for positive screening test
- 2. Which are polyp-related criteria for performing immediate polypectomy
in patients undergoing CRC screening
- primary FS screening
- b) colonoscopic assessment for positive screening test
- 3. Which is the appropriate and safe excision technique in patients
eligible for polypectomy in CRC screening?
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39
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- 4. Which are polyp-related criteria indicating referral to surgery in
patients detected with polyps at CRC screening
- 5. Which information should always be provided in the pathological
report to orient further assessment, treatment and surveillance of
patients detected with polyps at CRC screening
- 6. Which are appropriate quality indicators and standards to monitor and
evaluate management of patients detected with polyps at CRC screening
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40
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41
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- PICO(S) method; this is the method proposed by the Evidence Based
Medicine Working Group and is also the method followed to define the
objective and the inclusion criteria of studies by researchers who
perform a systematic review.
- P: patients characteristics
- I: experimental intervention and control intervention on which the
question is focused
- C: condition: pathology , illness
- O: outcome measure on which we are interested
- S: study design
- Example from chapter one
- Chapter 1.1 Evidence for efficacy of FOBt screening
- Chapter 1.2 Evidence for efficacy and Status of flexisig and colonoscopy
screening
- Some specific questions derived from this general questions could be:
- Is FOBT screening offered to general population aged 50 and older
effective in reducing colorectal cancer mortality and overall mortality?
- P: general population at average risk of colorectal cancer aged 50 years
and older
- I: FOBT screening test; control intervention: no screening
- C: colorectal cancer
- O: colorectal mortality, overall mortality at least at 5 (10) years of follow up
- S: RCTs, systematic reviews of RCTs
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42
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43
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44
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45
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46
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- Editorial board
- Chapters authors
- Contributors
- Reviewers
- Literature group
- Colorectal cancer screening network
- Project steering committee
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47
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48
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