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2017 ; 10
(ä): 49-60
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Is there evidence that we should screen the general population for Lynch syndrome
with genetic testing? A systematic review
#MMPMID28260941
Prince AE
; Cadigan RJ
; Henderson GE
; Evans JP
; Adams M
; Coker-Schwimmer E
; Penn DC
; Van Riper M
; Corbie-Smith G
; Jonas DE
Pharmgenomics Pers Med
2017[]; 10
(ä): 49-60
PMID28260941
show ga
BACKGROUND: The emerging dual imperatives of personalized medicine and
technologic advances make population screening for preventable conditions
resulting from genetic alterations a realistic possibility. Lynch syndrome is a
potential screening target due to its prevalence, penetrance, and the
availability of well-established, preventive interventions. However, while
population screening may lower incidence of preventable conditions,
implementation without evidence may lead to unintentional harms. We examined the
literature to determine whether evidence exists that screening for
Lynch-associated mismatch repair (MMR) gene mutations leads to improved overall
survival, cancer-specific survival, or quality of life. Documenting evidence and
gaps is critical to implementing genomic approaches in public health and guiding
future research. MATERIALS AND METHODS: Our 2014-2015 systematic review
identified studies comparing screening with no screening in the general
population, and controlled studies assessing analytic validity of targeted
next-generation sequencing, and benefits or harms of interventions or screening.
We conducted meta-analyses for the association between early or more frequent
colonoscopies and health outcomes. RESULTS: Twelve studies met our eligibility
criteria. No adequate evidence directly addressed the main question or the harms
of screening in the general population. Meta-analyses found relative reductions
of 68% for colorectal cancer incidence (relative risk: 0.32, 95% confidence
interval: 0.23-0.43, three cohort studies, 590 participants) and 78% for
all-cause mortality (relative risk: 0.22, 95% confidence interval: 0.09-0.56,
three cohort studies, 590 participants) for early or more frequent colonoscopies
among family members of people with cancer who also had an associated MMR gene
mutation. CONCLUSION: Inadequate evidence exists examining harms and benefits of
population-based screening for Lynch syndrome. Lack of evidence highlights the
need for data that directly compare benefits and harms.