41 symptom-free individuals aged 0-39 years who were at risk of familial adenomatous polyposis (FAP) were genotyped with six linked DNA probes. 28 individuals were informative for probes flanking the gene and 14 people assigned a probe-derived risk of over 0.93 were subsequently shown to be affected by clinical screening. 4 individuals who had been discharged from follow-up were designated high risk by this method. In those screened negative, risk was calculated from genotypic, colonic, and CHRPE findings and 89% of subjects had a risk below 0.003. An integrated risk analysis may have an important place in screening programmes for FAP.
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