Exclusion of a tight linkage between familial polyposis coli and HLA.

Linkage was investigated between a dominant gene determining familial polyposis coli (FPC) and HLA in a large pedigree. A tight linkage was excluded at a value of the recombination fraction between 0 and 5%. Linkage studies with various markers should be pursued to permit detection of high risk individuals and to better understand the phenotypic variability observed in certain polyposis families.