Hereditary Colorectal Cancer: Genetics and Screening

Area of Science:

• Oncology
• Genetics
• Gastroenterology

Background:

• Colorectal cancer (CRC) is a leading cause of cancer death.
• A family history of CRC is reported by 30% of patients, but only 5% have well-established mendelian inherited disorders.
• Serrated polyposis, a syndrome with increased CRC risk, has unknown genetics.

Purpose of the Study:

• To review the genetic and clinical aspects of key inherited colorectal cancer syndromes.
• To highlight the importance of understanding genetic predispositions in CRC.

Main Methods:

• Literature review focusing on genetic and clinical features of inherited CRC syndromes.
• Analysis of current understanding of Lynch syndrome, familial adenomatous polyposis, and MUTYH-associated polyposis.

Main Results:

• Lynch syndrome, familial adenomatous polyposis, and MUTYH-associated polyposis are significant inherited CRC syndromes.
• The genetic basis for serrated polyposis remains largely unknown.
• Genetic factors play a role in a subset of CRC cases.

Conclusions:

• Genetic counseling and testing are important for individuals with a family history of CRC.
• Further research into the genetics of CRC, including serrated polyposis, is warranted.
• Understanding inherited polyposis syndromes aids in CRC risk assessment and management.