A review of the genetic background and tumour profiling in familial colorectal cancer.

Inherited predisposition plays a role in 10-30% of colorectal cancer (CRC) cases. Of the large families with a clearly positive family history of CRC, ∼40% is not affected by known CRC syndromes. The existence of families with unexplained forms of inherited CRC--familial CRC--suggests the presence of still unknown high- or moderate-risk CRC predisposing factors. While the genomic profiles of sporadic CRCs have been studied extensively, few studies have analysed the tumour profiles of hereditary or familial CRC. Here, we review recent advances in genomic tumour profiling in familial CRC in comparison with sporadic CRC. In addition, we discuss the role of known CRC risk factors in familial CRC.