north east bowel screening cancer study doctorate of medicine, university of durham
TRANSCRIPT
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North East Bowel Screening Cancer Study
Doctorate of Medicine, University of Durham
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• Large scale epidemiological study of all colorectal cancers– In population eligible for screening as part of
the National Bowel Cancer Screening Programme
– Within the Northern Region
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• Approximately 1500 patients included– Aged 60-69 at time of diagnosis– Between April 2007- April 2010
• Combination of data from: – NORCCAG Database– Regional Bowel Cancer Screening Database
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Cases of Colorectal
Cancer
Screen Detected Cancer
Interval CancerNon-Uptake
Cancer
Non-Uptake of FOBt
Non-Uptake of Colonoscopy after Positive
FOBt
Cancer after Negative FOBt
Cancer after Negative
Colonoscopy
Cancer before Planned
Surveillance Colonoscopy
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• Comparing the three patient groups described above, are there any differences in the epidemiology of the patients? Examples of data analysed will be:– Socioeconomic group and level of deprivation– Co-morbidities
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• What is the rate of interval cancer within the screening programme?– What type of interval cancer?
– What are the reasons behind it?
– How many positive FOB windows to these patients have – should we be performing more colonoscopies on those with weakly positive tests?
– What groups of patients have an interval cancer?
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• Details of the cancers within each patient group– Are there any differences between the stages of
cancers found in each group?– Is there a shift towards earlier cancers within
the screen detected group and is there any difference in the interval group?
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Errors & Missing Data Review
Michael Gill
NORCCAG Research Fellow
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• Sample of data from NBOCAP extract– Analysed for
• Missing data
• Data accuracy
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• Database analysed by NORCCAG research fellows
• Error and missing data queries created using Microsoft Access
• Results summarised using SPSS
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ASA Grade
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Stomas
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• Of 1409 stomas recorded - total of 271 (19.2%) errors in recording of type of stoma– Includes those errors in the palliative procedure
category
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Urgency of Procedure
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Surgical Access
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Grade of Operating Surgeon
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Tumour Location vs. Operation
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• Of 5449 recorded procedures – Total of 271 (5.0%) errors– Including those errors within palliative
procedures
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Conclusion
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• Significant errors seen throughout the database– Some human error– Some inbuilt errors within NBOCAP
• NORCCAG is able to identify these errors and missing data with ease, in order to aid correction
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Any Questions?