Related Experiment Videos
Recent developments in hereditary nonpolyposis colorectal cancer
M E Craanen1, P Blok, G J Offerhaus
1Dept. of Gastroenterology and Pathology, Academic Medical Centre, Amsterdam, The Netherlands.
Scandinavian Journal of Gastroenterology. Supplement
|January 1, 1996
Summary
Hereditary non-polyposis colorectal cancer (HNPCC) is linked to microsatellite instability, not common gene mutations. Molecular screening for DNA mismatch repair gene mutations will improve HNPCC diagnosis and management.
Area of Science:
- Oncology
- Genetics
- Molecular Biology
Background:
- Hereditary non-polyposis colorectal cancer (HNPCC) presents with early-onset colorectal carcinoma (CRC), often proximally located, and potentially better survival than sporadic CRC.
- HNPCC is classified into Lynch syndromes I and II based on the presence or absence of extracolonic tumors (e.g., endometrial, stomach, urinary tract).
- The molecular underpinnings of HNPCC, though described early, are only recently being elucidated.
Purpose of the Study:
- To review the current understanding of the molecular basis of Hereditary non-polyposis colorectal cancer (HNPCC).
- To highlight the key molecular differences between HNPCC and sporadic colorectal cancer.
- To discuss the implications of molecular findings for HNPCC diagnosis and management.
Main Methods:
- Literature survey of published articles on Hereditary non-polyposis colorectal cancer (HNPCC).
Main Results:
- HNPCC tumors show no significant differences in APC, Ki-ras, and p53 gene alterations compared to sporadic CRC.
- Microsatellite instability is a hallmark of HNPCC, present in 80% of cases versus 13% in sporadic CRC.
- Mutations in DNA mismatch repair genes (hMSH2, hMLH1, hPMS1, hPMS2) are implicated in HNPCC, with hMSH2 and hMLH1 accounting for the majority of cases.
Conclusions:
- Accurate molecular screening tests are expected to become the gold standard for HNPCC diagnosis.
- These advancements will significantly impact the early detection and management strategies for individuals with HNPCC.
- Further research is needed to resolve remaining issues in HNPCC understanding and diagnosis.