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Impact of Screening on Survival in Familial Adenomatous Polyposis
source: Journal of Clinical Gastroenterology
year: 2016
authors: Koskenvuo L, Pitkäniemi J, Rantanen M, Lepistö A
summary/abstract:GOALS:
Our aim was to determine whether the screening of family members of familial adenomatous polyposis (FAP) patients significantly influences survival, and to gauge the extent of FAP-related causes of death.
BACKGROUND:
The screening of families with FAP has been shown to be profitable in reducing colorectal cancer-related mortality, but conclusions about the screening effect on overall survival has been controversial.
STUDY:
This is a nationwide population-based retrospective cohort study, and the primary outcome of interest was overall mortality and survival. A total of 154 families with at least 1 clinically diagnosed FAP patient between 1963 and 2015 were included. There were altogether 194 probands and 225 call-ups. During the follow-up period, 2639 person-years with 92 deaths among probands were observed and 3634 person-years and 30 deaths among call-ups. We report crude mortality rates and standardized mortality ratios together with descriptive statistics. We compared the survival of probands and call-ups to the population by relative survival method.
RESULTS:
The crude mortality rate among probands was 34.9 per 1000 person-years and 8.3 among call-ups. The standardized mortality ratios for call-ups was 2.47 (confidence interval, 1.69-3.46) and for probands 4.07 (confidence interval, 3.29-4.96) (P=0.014). The relative survival of probands was significantly lower than call-ups (P=0.0018), and 20-year relative survival for call-ups was 94% (88% to 100%). Over two thirds of all deaths were FAP related.
CONCLUSIONS:
Survival of screened family members of FAP patients is comparable to the general population within 20 years after diagnosis. Therefore, participation in surveillance should not be delayed when a family member with FAP has been detected.
organization: Helsinki University Hospital, Finnish Cancer Registry, Institute for Statistical and Epidemiological Cancer Research, Department of Public Health, University of Helsinki, Helsinki, FinlandDOI: 10.1097/MCG.0000000000000426
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